From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:58744) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UKVdo-0007iL-9f for qemu-devel@nongnu.org; Tue, 26 Mar 2013 11:18:34 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UKVdl-00027d-4u for qemu-devel@nongnu.org; Tue, 26 Mar 2013 11:18:24 -0400 Received: from mail-da0-x235.google.com ([2607:f8b0:400e:c00::235]:48276) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UKVdk-00027V-U4 for qemu-devel@nongnu.org; Tue, 26 Mar 2013 11:18:21 -0400 Received: by mail-da0-f53.google.com with SMTP id n34so2585216dal.26 for ; Tue, 26 Mar 2013 08:18:19 -0700 (PDT) MIME-Version: 1.0 From: =?UTF-8?B?5byg56OK5by6?= Date: Tue, 26 Mar 2013 23:10:35 +0800 Message-ID: Content-Type: multipart/alternative; boundary=047d7b624a8c00d27804d8d554dc Subject: [Qemu-devel] dataplane bug: fail to start Windows VM with dataplane enable List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: stefanha@redhat.com, pbonzini@redhat.com Cc: qemu-devel@nongnu.org, =?UTF-8?B?5byg56OK5by6?= --047d7b624a8c00d27804d8d554dc Content-Type: text/plain; charset=ISO-8859-1 Hi, Paolo && Stefan: When I test the dataplane feature with qemu master, I find that Windows (Windows 7 and Windows 2003) VM will hang if dataplane is enabled. But if I try to start a Fedora VM, it can start normally. The command I boot QEMU is: x86_64-softmmu/qemu-system-x86_64 -enable-kvm -m 1024 -smp 2 -drive file=win7.img,if=none,id=drive-virtio-disk,format=raw,cache=none,aio=native -device virtio-blk-pci,config-wce=off,scsi=off,x-data-plane=on,drive=drive-virtio-disk,id=virtio-disk I found the similar bug has reported some days ago: http://lists.nongnu.org/archive/html/qemu-devel/2013-03/msg02200.html . And a patch for this bug has already committed by Paolo at Mar 13: http://lists.nongnu.org/archive/html/qemu-devel/2013-03/msg02200.html . But it cannot work under my environment. Could you give me some advise to debug this problem ? I can provide more information if need. -- Best Regards, Leiqiang Zhang --047d7b624a8c00d27804d8d554dc Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable 
Hi,  Paolo && Stefan:

When I test the dataplane feature with qemu master, I find that Windows (Wi=
ndows 7 and Windows 2003) VM will hang if dataplane is enabled. But if I tr=
y to start a Fedora VM, it can start normally.

The command I boot QEMU is:
x86_64-softmmu/qemu-system-x86_64 -enable-kvm -m 1024 -smp 2 -drive
file=3Dwin7.img,if=3Dnone,id=3Ddrive-virtio-disk,format=3Draw,cache=3Dnone,=
aio=3Dnative
-device virtio-blk-pci,config-wce=3Doff,scsi=3Doff,x-data-plane=3Don,drive=
=3Ddrive-virtio-disk,id=3Dvirtio-disk

I found the similar bug has reported some days ago: =
http://lists.nongnu.org/archive/html/qemu-devel/2013-03/msg02200.html .=
 And a patch for this bug has already committed by Paolo at Mar 13: =
http://lists.nongnu.org/archive/html/qemu-devel/2013-03/msg02200.html .=
=A0
But it cannot work under my environment. Could you give me some advise=
 to debug this problem ? I can provide more information if need.
=
--=20
Best Regards,

Leiqiang Zhang


--047d7b624a8c00d27804d8d554dc-- From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:40923) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UKqSo-00060c-9n for qemu-devel@nongnu.org; Wed, 27 Mar 2013 09:32:30 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UKqSk-00045H-Td for qemu-devel@nongnu.org; Wed, 27 Mar 2013 09:32:26 -0400 Received: from mx1.redhat.com ([209.132.183.28]:60401) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UKqSk-000458-LE for qemu-devel@nongnu.org; Wed, 27 Mar 2013 09:32:22 -0400 Date: Wed, 27 Mar 2013 14:32:19 +0100 From: Stefan Hajnoczi Message-ID: <20130327133219.GB13100@stefanha-thinkpad.muc.redhat.com> References: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: Content-Transfer-Encoding: quoted-printable Subject: Re: [Qemu-devel] dataplane bug: fail to start Windows VM with dataplane enable List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: =?utf-8?B?5byg56OK5by6?= Cc: pbonzini@redhat.com, qemu-devel@nongnu.org On Tue, Mar 26, 2013 at 11:10:35PM +0800, =E5=BC=A0=E7=A3=8A=E5=BC=BA wro= te: > Hi, Paolo && Stefan: >=20 > When I test the dataplane feature with qemu master, I find that > Windows (Windows 7 and Windows 2003) VM will hang if dataplane is > enabled. But if I try to start a Fedora VM, it can start normally. >=20 > The command I boot QEMU is: > x86_64-softmmu/qemu-system-x86_64 -enable-kvm -m 1024 -smp 2 -drive > file=3Dwin7.img,if=3Dnone,id=3Ddrive-virtio-disk,format=3Draw,cache=3Dn= one,aio=3Dnative > -device virtio-blk-pci,config-wce=3Doff,scsi=3Doff,x-data-plane=3Don,dr= ive=3Ddrive-virtio-disk,id=3Dvirtio-disk >=20 > I found the similar bug has reported some days ago: > http://lists.nongnu.org/archive/html/qemu-devel/2013-03/msg02200.html > . And a patch for this bug has already committed by Paolo at Mar 13: > http://lists.nongnu.org/archive/html/qemu-devel/2013-03/msg02200.html > . >=20 > But it cannot work under my environment. Could you give me some advise > to debug this problem ? I can provide more information if need. Hi, I haven't gotten to the bottom of it yet but wanted to let you know that I'm seeing a hang at the boot screen after the installer reboots. The Windows logo animation runs but the guest seems unable to make progress. Will let you know when there is a fix. The guest I'm testing is Windows 7 Professional 64-bit. As a workaround you can set x-data-plane=3Doff to boot the guest for the first time. Subsequent boots will succeed with x-data-plane=3Don. Stefan From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:50798) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UKqvY-0002Pi-2a for qemu-devel@nongnu.org; Wed, 27 Mar 2013 10:02:11 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UKqvV-0007MO-Pn for qemu-devel@nongnu.org; Wed, 27 Mar 2013 10:02:08 -0400 Received: from mail-bk0-x230.google.com ([2a00:1450:4008:c01::230]:41003) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UKqvV-0007M3-Id for qemu-devel@nongnu.org; Wed, 27 Mar 2013 10:02:05 -0400 Received: by mail-bk0-f48.google.com with SMTP id jf3so1315320bkc.35 for ; Wed, 27 Mar 2013 07:02:04 -0700 (PDT) Date: Wed, 27 Mar 2013 15:02:01 +0100 From: Stefan Hajnoczi Message-ID: <20130327140201.GA29426@stefanha-thinkpad.muc.redhat.com> References: <20130327133219.GB13100@stefanha-thinkpad.muc.redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20130327133219.GB13100@stefanha-thinkpad.muc.redhat.com> Subject: Re: [Qemu-devel] dataplane bug: fail to start Windows VM with dataplane enable List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Stefan Hajnoczi Cc: pbonzini@redhat.com, qemu-devel@nongnu.org, =?utf-8?B?5byg56OK5by6?= On Wed, Mar 27, 2013 at 02:32:19PM +0100, Stefan Hajnoczi wrote: > On Tue, Mar 26, 2013 at 11:10:35PM +0800, 张磊强 wrote: > > Hi, Paolo && Stefan: > > > > When I test the dataplane feature with qemu master, I find that > > Windows (Windows 7 and Windows 2003) VM will hang if dataplane is > > enabled. But if I try to start a Fedora VM, it can start normally. > > > > The command I boot QEMU is: > > x86_64-softmmu/qemu-system-x86_64 -enable-kvm -m 1024 -smp 2 -drive > > file=win7.img,if=none,id=drive-virtio-disk,format=raw,cache=none,aio=native > > -device virtio-blk-pci,config-wce=off,scsi=off,x-data-plane=on,drive=drive-virtio-disk,id=virtio-disk > > > > I found the similar bug has reported some days ago: > > http://lists.nongnu.org/archive/html/qemu-devel/2013-03/msg02200.html > > . And a patch for this bug has already committed by Paolo at Mar 13: > > http://lists.nongnu.org/archive/html/qemu-devel/2013-03/msg02200.html > > . > > > > But it cannot work under my environment. Could you give me some advise > > to debug this problem ? I can provide more information if need. > > Hi, > I haven't gotten to the bottom of it yet but wanted to let you know that > I'm seeing a hang at the boot screen after the installer reboots. The > Windows logo animation runs but the guest seems unable to make progress. > > Will let you know when there is a fix. The guest I'm testing is Windows > 7 Professional 64-bit. > > As a workaround you can set x-data-plane=off to boot the guest for the > first time. Subsequent boots will succeed with x-data-plane=on. Next data point, it's not caused by the Paolo's AioContext conversion. This means it's unrelated to the recent bug that you mentioned. The boot gets stuck immediately after the switch from the BIOS virtio-blk driver to the Windows viostor driver. We get two requests (VIRTIO_BLK_T_GET_ID and VIRTIO_BLK_T_READ) and then the guest stops. The descriptor index of the second request has been incremented, perhaps the guest is not receiving host->guest notifies. Stefan From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:45053) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UKs58-0002U5-NL for qemu-devel@nongnu.org; Wed, 27 Mar 2013 11:16:11 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UKs53-00046k-JH for qemu-devel@nongnu.org; Wed, 27 Mar 2013 11:16:06 -0400 Received: from mail-bk0-x22f.google.com ([2a00:1450:4008:c01::22f]:45311) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UKs53-00046W-Cv for qemu-devel@nongnu.org; Wed, 27 Mar 2013 11:16:01 -0400 Received: by mail-bk0-f47.google.com with SMTP id ik5so1612065bkc.20 for ; Wed, 27 Mar 2013 08:16:00 -0700 (PDT) Date: Wed, 27 Mar 2013 16:15:56 +0100 From: Stefan Hajnoczi Message-ID: <20130327151556.GA32453@stefanha-thinkpad.muc.redhat.com> References: <20130327133219.GB13100@stefanha-thinkpad.muc.redhat.com> <20130327140201.GA29426@stefanha-thinkpad.muc.redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20130327140201.GA29426@stefanha-thinkpad.muc.redhat.com> Subject: Re: [Qemu-devel] dataplane bug: fail to start Windows VM with dataplane enable List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Stefan Hajnoczi Cc: pbonzini@redhat.com, "Michael S. Tsirkin" , qemu-devel@nongnu.org, =?utf-8?B?5byg56OK5by6?= On Wed, Mar 27, 2013 at 03:02:01PM +0100, Stefan Hajnoczi wrote: > On Wed, Mar 27, 2013 at 02:32:19PM +0100, Stefan Hajnoczi wrote: > > On Tue, Mar 26, 2013 at 11:10:35PM +0800, 张磊强 wrote: > > > Hi, Paolo && Stefan: > > > > > > When I test the dataplane feature with qemu master, I find that > > > Windows (Windows 7 and Windows 2003) VM will hang if dataplane is > > > enabled. But if I try to start a Fedora VM, it can start normally. > > > > > > The command I boot QEMU is: > > > x86_64-softmmu/qemu-system-x86_64 -enable-kvm -m 1024 -smp 2 -drive > > > file=win7.img,if=none,id=drive-virtio-disk,format=raw,cache=none,aio=native > > > -device virtio-blk-pci,config-wce=off,scsi=off,x-data-plane=on,drive=drive-virtio-disk,id=virtio-disk > > > > > > I found the similar bug has reported some days ago: > > > http://lists.nongnu.org/archive/html/qemu-devel/2013-03/msg02200.html > > > . And a patch for this bug has already committed by Paolo at Mar 13: > > > http://lists.nongnu.org/archive/html/qemu-devel/2013-03/msg02200.html > > > . > > > > > > But it cannot work under my environment. Could you give me some advise > > > to debug this problem ? I can provide more information if need. > > > > Hi, > > I haven't gotten to the bottom of it yet but wanted to let you know that > > I'm seeing a hang at the boot screen after the installer reboots. The > > Windows logo animation runs but the guest seems unable to make progress. > > > > Will let you know when there is a fix. The guest I'm testing is Windows > > 7 Professional 64-bit. > > > > As a workaround you can set x-data-plane=off to boot the guest for the > > first time. Subsequent boots will succeed with x-data-plane=on. > > Next data point, it's not caused by the Paolo's AioContext conversion. > This means it's unrelated to the recent bug that you mentioned. > > The boot gets stuck immediately after the switch from the BIOS > virtio-blk driver to the Windows viostor driver. We get two requests > (VIRTIO_BLK_T_GET_ID and VIRTIO_BLK_T_READ) and then the guest stops. > The descriptor index of the second request has been incremented, perhaps > the guest is not receiving host->guest notifies. Okay, getting closer to the root cause now. The guest driver has not enabled MSI-X and the guest notifier that dataplane uses is not hooked up to anything. When MSI-X is enabled the guest notifier is hooked up to irqfd and when MSI-X is disabled it is supposed to bounce back into QEMU which issues an ioctl for the interrupt. We've gotten into a state where the guest notifier exists but nothing is listening to it :). Therefore the guest is stuck waiting for virtio-blk I/O requests to complete. Stefan From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:53386) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UKsUC-0003hj-92 for qemu-devel@nongnu.org; Wed, 27 Mar 2013 11:42:05 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UKsU6-0005cC-Ta for qemu-devel@nongnu.org; Wed, 27 Mar 2013 11:42:00 -0400 Received: from mail-bk0-x22f.google.com ([2a00:1450:4008:c01::22f]:44357) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UKsU6-0005c2-MS for qemu-devel@nongnu.org; Wed, 27 Mar 2013 11:41:54 -0400 Received: by mail-bk0-f47.google.com with SMTP id ik5so1624657bkc.20 for ; Wed, 27 Mar 2013 08:41:53 -0700 (PDT) Date: Wed, 27 Mar 2013 16:41:49 +0100 From: Stefan Hajnoczi Message-ID: <20130327154149.GA3769@stefanha-thinkpad.muc.redhat.com> References: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Subject: Re: [Qemu-devel] dataplane bug: fail to start Windows VM with dataplane enable List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: =?utf-8?B?5byg56OK5by6?= Cc: pbonzini@redhat.com, qemu-devel@nongnu.org, stefanha@redhat.com On Tue, Mar 26, 2013 at 11:10:35PM +0800, 张磊强 wrote: > Hi, Paolo && Stefan: > > When I test the dataplane feature with qemu master, I find that > Windows (Windows 7 and Windows 2003) VM will hang if dataplane is > enabled. But if I try to start a Fedora VM, it can start normally. > > The command I boot QEMU is: > x86_64-softmmu/qemu-system-x86_64 -enable-kvm -m 1024 -smp 2 -drive > file=win7.img,if=none,id=drive-virtio-disk,format=raw,cache=none,aio=native > -device virtio-blk-pci,config-wce=off,scsi=off,x-data-plane=on,drive=drive-virtio-disk,id=virtio-disk > > I found the similar bug has reported some days ago: > http://lists.nongnu.org/archive/html/qemu-devel/2013-03/msg02200.html > . And a patch for this bug has already committed by Paolo at Mar 13: > http://lists.nongnu.org/archive/html/qemu-devel/2013-03/msg02200.html > . > > But it cannot work under my environment. Could you give me some advise > to debug this problem ? I can provide more information if need. I sent a fix and CCed you on the patch. Please test it if you have time. Stefan From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:36984) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UL43s-0006hb-4O for qemu-devel@nongnu.org; Thu, 28 Mar 2013 00:03:39 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UL43o-00026W-IF for qemu-devel@nongnu.org; Thu, 28 Mar 2013 00:03:36 -0400 Received: from mail-pd0-f177.google.com ([209.85.192.177]:57936) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UL43o-000264-9g for qemu-devel@nongnu.org; Thu, 28 Mar 2013 00:03:32 -0400 Received: by mail-pd0-f177.google.com with SMTP id y14so3815311pdi.8 for ; Wed, 27 Mar 2013 21:03:31 -0700 (PDT) Date: Thu, 28 Mar 2013 12:03:17 +0800 From: leiqzhang Message-ID: <67ACAA1D2D06420ABEB53D364FCB6631@gmail.com> In-Reply-To: <20130327154149.GA3769@stefanha-thinkpad.muc.redhat.com> References: <20130327154149.GA3769@stefanha-thinkpad.muc.redhat.com> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="5153c105_7fdcc233_6191" Subject: [Qemu-devel] =?utf-8?Q?=E5=9B=9E=E5=A4=8D=EF=BC=9A_?= dataplane bug: fail to start Windows VM with dataplane enable List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Stefan Hajnoczi Cc: pbonzini@redhat.com, qemu-devel@nongnu.org, stefanha@redhat.com, =?utf-8?Q?=E5=BC=A0_=E7=A3=8A=E5=BC=BA?= --5153c105_7fdcc233_6191 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Hi, Stefan: Thank for your reply and patch. I have done the test for Windows 7, W= indows 2003, and fedora. The patch has fixed the problem now, thanks. =20 -- =20 leiqzhang Sent by Sparrow (http://www.sparrowmailapp.com/=3Fsig) =E5=9C=A8 2013=E5=B9=B43=E6=9C=8827=E6=97=A5=E6=98=9F=E6=9C=9F=E4=B8=89=EF= =BC=8C23:41=EF=BC=8CStefan Hajnoczi =E5=86=99=E9=81=93=EF=BC=9A > On Tue, Mar 26, 2013 at 11:10:35PM +0800, =E5=BC=A0=E7=A3=8A=E5=BC=BA w= rote: > > Hi, Paolo && Stefan: > > =20 > > When I test the dataplane feature with qemu master, I find that > > Windows (Windows 7 and Windows 2003) VM will hang if dataplane is > > enabled. But if I try to start a =46edora VM, it can start normally. > > =20 > > The command I boot QEMU is: > > x86=5F64-softmmu/qemu-system-x86=5F64 -enable-kvm -m 1024 -smp 2 -dri= ve > > file=3Dwin7.img,if=3Dnone,id=3Ddrive-virtio-disk,format=3Draw,cache=3D= none,aio=3Dnative > > -device virtio-blk-pci,config-wce=3Doff,scsi=3Doff,x-data-plane=3Don,= drive=3Ddrive-virtio-disk,id=3Dvirtio-disk > > =20 > > I found the similar bug has reported some days ago: > > http://lists.nongnu.org/archive/html/qemu-devel/2013-03/msg02200.html= > > . And a patch for this bug has already committed by Paolo at Mar 13: > > http://lists.nongnu.org/archive/html/qemu-devel/2013-03/msg02200.html= > > . > > =20 > > But it cannot work under my environment. Could you give me some advis= e > > to debug this problem =3F I can provide more information if need. > > =20 > =20 > =20 > I sent a fix and CCed you on the patch. Please test it if you have > time. > =20 > Stefan =20 --5153c105_7fdcc233_6191 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline
Hi, Stefan:<= /span>

    Thank for your reply and patch. I= have done the test for Windows 7, Windows 2003, and fedora.
=

     The patch has fixed the problem now, = thanks. 

-- 
leiqzhang
Sent by  Sparrow

=20

=E5=9C=A8 2013=E5=B9=B43=E6=9C=882= 7=E6=97=A5=E6=98=9F=E6=9C=9F=E4=B8=89=EF=BC=8C23:41=EF=BC=8CStefan Hajnoc= zi =E5=86=99=E9=81=93=EF=BC=9A

On Tue, Mar 26, = 2013 at 11:10:35PM +0800, =E5=BC=A0=E7=A3=8A=E5=BC=BA wrote:
Hi, Paolo && Stefan:
=
When I test the dataplane feature with qemu master, I find= that
Windows (Windows 7 and Windows 2003) VM will hang if data= plane is
enabled. But if I try to start a =46edora VM, it can s= tart normally.

The command I boot QEMU is:
=
x86=5F64-softmmu/qemu-system-x86=5F64 -enable-kvm -m 1024 -smp 2 -dr= ive
file=3Dwin7.img,if=3Dnone,id=3Ddrive-virtio-disk,format=3Dr= aw,cache=3Dnone,aio=3Dnative
-device virtio-blk-pci,config-wce=3D= off,scsi=3Doff,x-data-plane=3Don,drive=3Ddrive-virtio-disk,id=3Dvirtio-di= sk

I found the similar bug has reported some day= s ago:
http://lists.nongnu.org/archive/html/qemu-devel/2013-03/= msg02200.html
. And a patch for this bug has already committed = by Paolo at Mar 13:
http://lists.nongnu.org/archive/html/qemu-d= evel/2013-03/msg02200.html
.

But it ca= nnot work under my environment. Could you give me some advise
t= o debug this problem =3F I can provide more information if need.

I sent a fix and CCed you on the patc= h. Please test it if you have
time.

S= tefan
=20 =20 =20 =20 =20

--5153c105_7fdcc233_6191-- From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:49987) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UMetQ-0001ck-Mo for qemu-devel@nongnu.org; Mon, 01 Apr 2013 09:35:33 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UMetL-0004pT-H1 for qemu-devel@nongnu.org; Mon, 01 Apr 2013 09:35:24 -0400 Received: from szxga02-in.huawei.com ([119.145.14.65]:1402) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UMetK-0004oS-KU for qemu-devel@nongnu.org; Mon, 01 Apr 2013 09:35:19 -0400 From: Zhangleiqiang Date: Mon, 1 Apr 2013 13:34:36 +0000 Message-ID: <3A6795EA1206904E94BEC8EF9DF109AE05D381F9@szxeml510-mbx.china.huawei.com> References: <20130327154149.GA3769@stefanha-thinkpad.muc.redhat.com> <67ACAA1D2D06420ABEB53D364FCB6631@gmail.com> In-Reply-To: <67ACAA1D2D06420ABEB53D364FCB6631@gmail.com> Content-Language: zh-CN Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Subject: [Qemu-devel] question about performance of dataplane List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Stefan Hajnoczi , "stefanha@redhat.com" Cc: Zhangleiqiang , "Luohao (brian)" , "qemu-devel@nongnu.org" , Haofeng , leiqzhang SGksIFN0ZWZhbu+8mg0KDQoJSSBoYXZlIGRvbmUgc29tZSB0ZXN0aW5nIHRvIGNvbXBhcmUgdGhl IHBlcmZvcm1hbmNlIG9mIGRhdGFwbGFuZSBhbmQgbm9uLWRhdGFwbGFuZS4gIEJ1dCB0aGUgcmVz dWx0IGRpZCBub3QgbWVldCBteSBleHBlY3RhdGlvbnMsIHRoZSBwZXJmb3JtYW5jZSBvZiBkaXNr IHdpdGggZGF0YXBsYW5lIGVuYWJsZWQgZGlkIG5vdCBoYXZlIGFkdmFudGFnZSBvdmVyIG5vbi1k YXRhcGxhbmUuIA0KDQoJVGhlIGZvbGxvd2luZyAgY29udGFpbnMgdGhlICBlbnZpcm9ubWVudCBp bmZvIGFuZCB0ZXN0aW5nIHJlc3VsdHMuICBEb2VzIG15IHRlc3RpbmcgbWV0aG9kIG9yIHRlc3Rp bmcgZW52aXJvbm1lbnQgaGF2ZSBzb21ldGhpbmcgd3JvbmcgPyAgQ291bGQgeW91IGdpdmUgbWUg c29tZSBhZHZpY2U/ICBJIGNhbiBwcm92aWRlIG1vcmUgaW5mb3JtYXRpb24gaWYgbmVlZC4NCg0K 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bW1pdHRlZCBieSBQYW9sbyBhdCBNYXIgMTM6DQo+IGh0dHA6Ly9saXN0cy5ub25nbnUub3JnL2Fy Y2hpdmUvaHRtbC9xZW11LWRldmVsLzIwMTMtMDMvbXNnMDIyMDAuaHRtbA0KPiAuDQo+IA0KPiBC dXQgaXQgY2Fubm90IHdvcmsgdW5kZXIgbXkgZW52aXJvbm1lbnQuIENvdWxkIHlvdSBnaXZlIG1l IHNvbWUgYWR2aXNlDQo+IHRvIGRlYnVnIHRoaXMgcHJvYmxlbSA/IEkgY2FuIHByb3ZpZGUgbW9y ZSBpbmZvcm1hdGlvbiBpZiBuZWVkLg0KPiANCj4gSSBzZW50IGEgZml4IGFuZCBDQ2VkIHlvdSBv biB0aGUgcGF0Y2guIFBsZWFzZSB0ZXN0IGl0IGlmIHlvdSBoYXZlDQo+IHRpbWUuDQo+IA0KPiBT dGVmYW4NCj4NCg== From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:33540) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UMqZR-0001OE-3m for qemu-devel@nongnu.org; Mon, 01 Apr 2013 22:03:36 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UMqZN-0004Ve-T2 for qemu-devel@nongnu.org; Mon, 01 Apr 2013 22:03:33 -0400 Received: from szxga01-in.huawei.com ([119.145.14.64]:65249) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UMqZM-0004Us-QR for qemu-devel@nongnu.org; Mon, 01 Apr 2013 22:03:29 -0400 From: Zhangleiqiang Date: Tue, 2 Apr 2013 02:02:54 +0000 Message-ID: <3A6795EA1206904E94BEC8EF9DF109AE05D38653@szxeml510-mbx.china.huawei.com> References: <20130327154149.GA3769@stefanha-thinkpad.muc.redhat.com> <67ACAA1D2D06420ABEB53D364FCB6631@gmail.com> <3A6795EA1206904E94BEC8EF9DF109AE05D381F9@szxeml510-mbx.china.huawei.com> In-Reply-To: <3A6795EA1206904E94BEC8EF9DF109AE05D381F9@szxeml510-mbx.china.huawei.com> Content-Language: zh-CN Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Subject: [Qemu-devel] =?utf-8?b?562U5aSNOiAgcXVlc3Rpb24gYWJvdXQgcGVyZm9y?= =?utf-8?q?mance_of_dataplane?= List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Stefan Hajnoczi , "stefanha@redhat.com" Cc: Zhangleiqiang , "Luohao (brian)" , "qemu-devel@nongnu.org" , Haofeng , leiqzhang 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by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UNeTc-00049d-Hi for qemu-devel@nongnu.org; Thu, 04 Apr 2013 03:21:00 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UNeTW-00023s-CT for qemu-devel@nongnu.org; Thu, 04 Apr 2013 03:20:52 -0400 Received: from mx1.redhat.com ([209.132.183.28]:30307) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UNeTV-00023j-Ul for qemu-devel@nongnu.org; Thu, 04 Apr 2013 03:20:46 -0400 Date: Thu, 4 Apr 2013 09:20:38 +0200 From: Stefan Hajnoczi Message-ID: <20130404072038.GA24402@stefanha-thinkpad.redhat.com> References: <20130327154149.GA3769@stefanha-thinkpad.muc.redhat.com> <67ACAA1D2D06420ABEB53D364FCB6631@gmail.com> <3A6795EA1206904E94BEC8EF9DF109AE05D381F9@szxeml510-mbx.china.huawei.com> <3A6795EA1206904E94BEC8EF9DF109AE05D38653@szxeml510-mbx.china.huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3A6795EA1206904E94BEC8EF9DF109AE05D38653@szxeml510-mbx.china.huawei.com> Subject: Re: [Qemu-devel] =?utf-8?b?562U5aSNOiAgcXVlc3Rpb24gYWJvdXQgcGVyZm9y?= =?utf-8?q?mance_of_dataplane?= List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Zhangleiqiang Cc: Stefan Hajnoczi , "Luohao (brian)" , "qemu-devel@nongnu.org" , Haofeng , leiqzhang On Tue, Apr 02, 2013 at 02:02:54AM +0000, Zhangleiqiang wrote: > I have also finished the perf testing under Fedora 17 using IOZone, and the results also shown that the performance of disk with dataplane enabled did not have advantage over non-dataplane. virtio-blk data plane is a win for parallel I/O workloads (that means iodepth > 1). The advantage becomes clearer with SMP guests. In other words the big advantage is that data plane processes requests without blocking the QEMU main loop or vCPU threads. If your guest has 1 vCPU and/or your benchmarks only do a single stream of I/O requests, then the difference may not be measurable. Stefan From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:45940) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UOnp8-0003Rb-8Q for qemu-devel@nongnu.org; Sun, 07 Apr 2013 07:31:57 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UOnp5-0003ll-35 for qemu-devel@nongnu.org; Sun, 07 Apr 2013 07:31:50 -0400 Received: from szxga02-in.huawei.com ([119.145.14.65]:57181) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UOnp4-0003ke-7j for qemu-devel@nongnu.org; Sun, 07 Apr 2013 07:31:47 -0400 From: Zhangleiqiang Date: Sun, 7 Apr 2013 11:31:20 +0000 Message-ID: <3A6795EA1206904E94BEC8EF9DF109AE05D3A944@szxeml510-mbx.china.huawei.com> References: <20130327154149.GA3769@stefanha-thinkpad.muc.redhat.com> <67ACAA1D2D06420ABEB53D364FCB6631@gmail.com> <3A6795EA1206904E94BEC8EF9DF109AE05D381F9@szxeml510-mbx.china.huawei.com> <3A6795EA1206904E94BEC8EF9DF109AE05D38653@szxeml510-mbx.china.huawei.com> <20130404072038.GA24402@stefanha-thinkpad.redhat.com> In-Reply-To: <20130404072038.GA24402@stefanha-thinkpad.redhat.com> Content-Language: zh-CN Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Subject: [Qemu-devel] =?gb2312?b?tPC4tDogtPC4tDogIHF1ZXN0aW9uIGFib3V0IHBl?= =?gb2312?b?cmZvcm1hbmNlIG9mIGRhdGFwbGFuZQ==?= List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Stefan Hajnoczi Cc: Zhangleiqiang , Stefan Hajnoczi , "Luohao (brian)" , "qemu-devel@nongnu.org" , Haofeng SGksIFN0ZWZhbjoNCg0KCUZvbGxvdyB5b3VyIGFkdmljZSwgSSBoYXZlIGZpbmlzaGVkIHRoZSBi ZW5jaG1hcmtzIHdpdGggbXVsdGlwbGUgdmNwdSAoc21wKSBhbmQgcGFyYWxsZWwgSS9PIHdvcmts b2Fkcy4gDQoJVGhlIHJlc3VsdHMgc3RpbGwgc2hvdyB0aGF0IHRoZSBwZXJmb3JtYW5jZSBvZiBk aXNrIHdpdGggZGF0YXBsYW5lIGVuYWJsZWQgZGlkIG5vdCBoYXZlIGFkdmFudGFnZSBvdmVyIG5v 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<20130327154149.GA3769@stefanha-thinkpad.muc.redhat.com> <67ACAA1D2D06420ABEB53D364FCB6631@gmail.com> <3A6795EA1206904E94BEC8EF9DF109AE05D381F9@szxeml510-mbx.china.huawei.com> <3A6795EA1206904E94BEC8EF9DF109AE05D38653@szxeml510-mbx.china.huawei.com> <20130404072038.GA24402@stefanha-thinkpad.redhat.com> <3A6795EA1206904E94BEC8EF9DF109AE05D3A944@szxeml510-mbx.china.huawei.com> In-Reply-To: Content-Language: zh-CN Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Subject: [Qemu-devel] =?gb2312?b?tPC4tDogILTwuLQ6ILTwuLQ6ICBxdWVzdGlvbiBh?= =?gb2312?b?Ym91dCBwZXJmb3JtYW5jZSBvZiBkYXRhcGxhbmU=?= List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Abel Gordon Cc: Zhangleiqiang , "Luohao (brian)" , Haofeng , Stefan Hajnoczi , "qemu-devel@nongnu.org" , Stefan Hajnoczi SGksIEFiZWwgR29yZG9uOg0KDQoJVGhlIENQVSBpbmZvIG9mIGhvc3QgaXMgYXMgZm9sbG93czoN 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aGUgZm9ybWVyIGhhcw0KPiA+IG9idmlvdXMgYWR2YW50YWdlLg0KPiANCj4gSGksIExlaXF6aGFu Zw0KPiANCj4gSW50ZXJlc3RpbmcgbnVtYmVycy4gSG93IG1hbnkgY29yZXMgdGhlIGhvc3QgaGFz ID8gd2FzIEhUIGVuYWJsZWQgPw0KPiBEaWQgeW91IHRyeSB0byBzZWUgd2hhdCBoYXBwZW5zIHdo ZW4geW91IHJ1biBtb3JlIHRoYW4gMSBndWVzdCBhbmQgd2hlbg0KPiB5b3UgY3JlYXRlIGF0IGxl YXN0IDEgVkNQVSBwZXIgY29yZSBpbiB0aGUgaG9zdCAgPw0K From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:54853) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UOqEJ-00005V-Td for qemu-devel@nongnu.org; Sun, 07 Apr 2013 10:06:05 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UOqEC-0007Jt-UT for qemu-devel@nongnu.org; Sun, 07 Apr 2013 10:05:59 -0400 Received: from mail-oa0-f42.google.com ([209.85.219.42]:42005) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UOqEC-0007Jb-Nw for qemu-devel@nongnu.org; Sun, 07 Apr 2013 10:05:52 -0400 Received: by mail-oa0-f42.google.com with SMTP id i18so5449718oag.29 for ; Sun, 07 Apr 2013 07:05:51 -0700 (PDT) From: Anthony Liguori In-Reply-To: <3A6795EA1206904E94BEC8EF9DF109AE05D381F9@szxeml510-mbx.china.huawei.com> References: <20130327154149.GA3769@stefanha-thinkpad.muc.redhat.com> <67ACAA1D2D06420ABEB53D364FCB6631@gmail.com> <3A6795EA1206904E94BEC8EF9DF109AE05D381F9@szxeml510-mbx.china.huawei.com> Date: Sun, 07 Apr 2013 09:05:47 -0500 Message-ID: <874nfio2pw.fsf@codemonkey.ws> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Subject: Re: [Qemu-devel] question about performance of dataplane List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Zhangleiqiang , Stefan Hajnoczi , "stefanha@redhat.com" Cc: "Luohao (brian)" , "qemu-devel@nongnu.org" , Haofeng , leiqzhang Zhangleiqiang writes: > Hi, Stefan=EF=BC=9A > > I have done some testing to compare the performance of dataplane and non= -dataplane. But the result did not meet my expectations, the performance o= f disk with dataplane enabled did not have advantage over non-dataplane.=20 > > The following contains the environment info and testing results. Does= my testing method or testing environment have something wrong ? Could you= give me some advice? I can provide more information if need. > > > 1. Environment: > a). Qemu 1.4 master branch > b). kernel: 3.5.0-2.fc17.x86_64 > c). virtual disks location: the same local SATA harddisk > with ext4 fs I doubt you'll see any performance difference with a single SATA drive. There's no real parallelism possible as you have exactly one spindle available. > datasize/RW_Ratio IOPS_dataplane IOPS_non_dataplane MBPS_dataplane MBPS_= non_dataplane > 16K/0% 294.094948 293.609606 4.595234 4.58765 > 16K/25% 283.096745 281.649258 4.423387 4.40077 > 16K/75% 316.039801 309.585336 4.938122 4.837271 > 32K/0% 257.529537 258.806128 8.047798 8.087692 > 32K/25% 253.729281 253.756673 7.92904 7.929896 > 32K/75% 292.384568 280.991434 9.137018 8.780982 > 4K/0% 321.599352 324.116063 1.256247 1.266078 > 4K/25% 309.906635 309.294278 1.210573 1.208181 > 4K/75% 350.168882 > 350.772329 1.367847 > 1.370204 You are getting 300 MB/s to a single SATA disk? I strongly suspect you are seeing cache interaction. I'd suggest disabling WCE on the disk if you're going to benchmark like this. I'd also guess 300 MB/s is what you're maxing out at with native too. So presumably normal virtio-blk is already getting close to native performance. dataplane certainly isn't going to give you better than native performance :-) Regards, Anthony Liguori > > > > ---------- > Leiqzhang > > Best Regards > > >> =E5=8F=91=E4=BB=B6=E4=BA=BA: qemu-devel-bounces+zhangleiqiang=3Dhuawei.c= om@nongnu.org [mailto:qemu-devel-bounces+zhangleiqiang=3Dhuawei.com@nongnu.= org] =E4=BB=A3=E8=A1=A8 leiqzhang >> =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2013=E5=B9=B43=E6=9C=8828=E6=97=A5= 12:03 >> =E6=94=B6=E4=BB=B6=E4=BA=BA: Stefan Hajnoczi >> =E6=8A=84=E9=80=81: pbonzini@redhat.com; qemu-devel@nongnu.org; stefanha= @redhat.com; =E5=BC=A0 =E7=A3=8A=E5=BC=BA >> =E4=B8=BB=E9=A2=98: [Qemu-devel] =E5=9B=9E=E5=A4=8D=EF=BC=9A dataplane b= ug: fail to start Windows VM with dataplane enable >>=20 >> Hi, Stefan: >>=20 >> Thank for your reply and patch. I have done the test for Windows 7, = Windows 2003, and fedora. >>=20 >> The patch has fixed the problem now, thanks.=20 >>=20 >> --=20 >> leiqzhang >> Sent by Sparrow >>=20 >> =E5=9C=A8 2013=E5=B9=B43=E6=9C=8827=E6=97=A5=E6=98=9F=E6=9C=9F=E4=B8=89= =EF=BC=8C23:41=EF=BC=8CStefan Hajnoczi =E5=86=99=E9=81=93=EF=BC=9A >> On Tue, Mar 26, 2013 at 11:10:35PM +0800, =E5=BC=A0=E7=A3=8A=E5=BC=BA wr= ote: >> Hi, Paolo && Stefan: >>=20 >> When I test the dataplane feature with qemu master, I find that >> Windows (Windows 7 and Windows 2003) VM will hang if dataplane is >> enabled. But if I try to start a Fedora VM, it can start normally. >>=20 >> The command I boot QEMU is: >> x86_64-softmmu/qemu-system-x86_64 -enable-kvm -m 1024 -smp 2 -drive >> file=3Dwin7.img,if=3Dnone,id=3Ddrive-virtio-disk,format=3Draw,cache=3Dno= ne,aio=3Dnative >> -device virtio-blk-pci,config-wce=3Doff,scsi=3Doff,x-data-plane=3Don,dri= ve=3Ddrive-virtio-disk,id=3Dvirtio-disk >>=20 >> I found the similar bug has reported some days ago: >> http://lists.nongnu.org/archive/html/qemu-devel/2013-03/msg02200.html >> . And a patch for this bug has already committed by Paolo at Mar 13: >> http://lists.nongnu.org/archive/html/qemu-devel/2013-03/msg02200.html >> . >>=20 >> But it cannot work under my environment. Could you give me some advise >> to debug this problem ? I can provide more information if need. >>=20 >> I sent a fix and CCed you on the patch. Please test it if you have >> time. >>=20 >> Stefan >> From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:55150) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UOqFu-0000wL-Mv for qemu-devel@nongnu.org; Sun, 07 Apr 2013 10:07:48 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UOqFk-0007fw-Sk for qemu-devel@nongnu.org; Sun, 07 Apr 2013 10:07:38 -0400 Received: from e06smtp17.uk.ibm.com ([195.75.94.113]:35001) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UOq9g-0005gC-Ue for qemu-devel@nongnu.org; Sun, 07 Apr 2013 10:01:13 -0400 Received: from /spool/local by e06smtp17.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Sun, 7 Apr 2013 14:58:44 +0100 Received: from b06cxnps3075.portsmouth.uk.ibm.com (d06relay10.portsmouth.uk.ibm.com [9.149.109.195]) by d06dlp02.portsmouth.uk.ibm.com (Postfix) with ESMTP id 019E2219005C for ; Sun, 7 Apr 2013 15:03:13 +0100 (BST) Received: from d06av12.portsmouth.uk.ibm.com (d06av12.portsmouth.uk.ibm.com [9.149.37.247]) by b06cxnps3075.portsmouth.uk.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r37E0w7D48890100 for ; Sun, 7 Apr 2013 14:00:58 GMT Received: from d06av12.portsmouth.uk.ibm.com (loopback [127.0.0.1]) by d06av12.portsmouth.uk.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r37E17B7002960 for ; Sun, 7 Apr 2013 08:01:07 -0600 In-Reply-To: <3A6795EA1206904E94BEC8EF9DF109AE05D3A964@szxeml510-mbx.china.huawei.com> References: <20130327154149.GA3769@stefanha-thinkpad.muc.redhat.com> <67ACAA1D2D06420ABEB53D364FCB6631@gmail.com> <3A6795EA1206904E94BEC8EF9DF109AE05D381F9@szxeml510-mbx.china.huawei.com> <3A6795EA1206904E94BEC8EF9DF109AE05D38653@szxeml510-mbx.china.huawei.com> <20130404072038.GA24402@stefanha-thinkpad.redhat.com> <3A6795EA1206904E94BEC8EF9DF109AE05D3A944@szxeml510-mbx.china.huawei.com> <3A6795EA1206904E94BEC8EF9DF109AE05D3A964@szxeml510-mbx.china.huawei.com> Message-ID: From: Abel Gordon Date: Sun, 7 Apr 2013 17:01:06 +0300 MIME-Version: 1.0 Content-type: text/plain; charset=US-ASCII Subject: Re: [Qemu-devel] =?gb2312?b?tPC4tDogILTwuLQ6ILTwuLQ6ICBxdWVzdGlvbiBh?= =?gb2312?b?Ym91dCBwZXJmb3JtYW5jZSBvZiBkYXRhcGxhbmU=?= List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Zhangleiqiang Cc: Stefan Hajnoczi , "Luohao (brian)" , Stefan Hajnoczi , "qemu-devel@nongnu.org" , Haofeng Zhangleiqiang wrote on 07/04/2013 04:34:45 PM: > Hi, Abel Gordon: > > The CPU info of host is as follows: > > Physical CPU: 2 > Core Per Phy CPU: 6 > HT: enabled > > According to your advice, I have finished another benchmark which > ensures vcpus (32) is more than the cpu cores of host (24). The > Results showed that the dataplane enabled did have obvious advantage > over non-dataplane under Random write mode too. Thank you very much for sharing these numbers. Did you try to evaluate how both mechanisms scale with many VMs ? For example, you can run: 1 VM with 2 VCPUs then 2 VMs with 2 VCPUs each then 3 VMs with 2 VCPUs each ... up to 12 VMs with 2 VCPUs each and compare the results: average performance per VM for each configuration. From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:58720) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UOsda-0007aE-Rr for qemu-devel@nongnu.org; Sun, 07 Apr 2013 12:40:22 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UOsdS-0004ct-Rw for qemu-devel@nongnu.org; Sun, 07 Apr 2013 12:40:14 -0400 Received: from e06smtp12.uk.ibm.com ([195.75.94.108]:36535) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UOsdS-0004XL-JA for qemu-devel@nongnu.org; Sun, 07 Apr 2013 12:40:06 -0400 Received: from /spool/local by e06smtp12.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Sun, 7 Apr 2013 17:37:00 +0100 Received: from b06cxnps4076.portsmouth.uk.ibm.com (d06relay13.portsmouth.uk.ibm.com [9.149.109.198]) by d06dlp03.portsmouth.uk.ibm.com (Postfix) with ESMTP id BFCBA1B0805F for ; Sun, 7 Apr 2013 17:40:01 +0100 (BST) Received: from d06av09.portsmouth.uk.ibm.com (d06av09.portsmouth.uk.ibm.com [9.149.37.250]) by b06cxnps4076.portsmouth.uk.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r37GdpFV36044806 for ; Sun, 7 Apr 2013 16:39:52 GMT Received: from d06av09.portsmouth.uk.ibm.com (loopback [127.0.0.1]) by d06av09.portsmouth.uk.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r37Ge14h030479 for ; Sun, 7 Apr 2013 10:40:01 -0600 In-Reply-To: References: <20130327154149.GA3769@stefanha-thinkpad.muc.redhat.com> <67ACAA1D2D06420ABEB53D364FCB6631@gmail.com> <3A6795EA1206904E94BEC8EF9DF109AE05D381F9@szxeml510-mbx.china.huawei.com> <3A6795EA1206904E94BEC8EF9DF109AE05D38653@szxeml510-mbx.china.huawei.com> <20130404072038.GA24402@stefanha-thinkpad.redhat.com> <3A6795EA1206904E94BEC8EF9DF109AE05D3A944@szxeml510-mbx.china.huawei.com> <3A6795EA1206904E94BEC8EF9DF109AE05D3A964@szxeml510-mbx.china.huawei.com> Message-ID: From: Abel Gordon Date: Sun, 7 Apr 2013 19:40:00 +0300 MIME-Version: 1.0 Content-type: text/plain; charset=GB2312 Content-transfer-encoding: base64 Subject: Re: [Qemu-devel] =?gb2312?b?tPC4tDogtPC4tDogtPC4tDogcXVlc3Rpb24gYWJv?= =?gb2312?b?dXQgcGVyZm9ybWFuY2Ugb2YgZGF0YXBsYW5l?= List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: =?GB2312?B?1cXA2se/?= Cc: Zhangleiqiang , "Luohao (brian)" , Haofeng , Stefan Hajnoczi , "qemu-devel@nongnu.org" , Stefan Hajnoczi DQoNCtXFwNrHvyA8bGVpcXpoYW5nQGdtYWlsLmNvbT4gd3JvdGUgb24gMDcvMDQvMjAxMyAwNzox MDoyNCBQTToNCg0KPg0KPiBISSwgQWJlbCAmIFN0ZWZhbjoNCj4NCj4gICAgICBBZnRlciB0aGlu a2luZyB0d2ljZSBhYm91dCB0aGUgYmVuY2htYXJrcyBhbmQgdGhlIGlkZWEgb2YNCj4gZGF0YXBs 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cyBwcm9ibGVtID8gSSBjYW4gcHJvdmlkZSBtb3JlIGluZm9ybWF0aW9uIGlmIG5lZWQuDQo+ID4+ DQo+ID4+IEkgc2VudCBhIGZpeCBhbmQgQ0NlZCB5b3Ugb24gdGhlIHBhdGNoLiBQbGVhc2UgdGVz dCBpdCBpZiB5b3UgaGF2ZQ0KPiA+PiB0aW1lLg0KPiA+Pg0KPiA+PiBTdGVmYW4NCj4gPj4NCg== From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:38402) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UP82Q-0005td-HK for qemu-devel@nongnu.org; Mon, 08 Apr 2013 05:07:05 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UP82I-00032I-Hw for qemu-devel@nongnu.org; Mon, 08 Apr 2013 05:06:54 -0400 Received: from szxga01-in.huawei.com ([119.145.14.64]:39245) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UP82H-00031r-VL for qemu-devel@nongnu.org; Mon, 08 Apr 2013 05:06:46 -0400 From: Zhangleiqiang Date: Mon, 8 Apr 2013 09:06:17 +0000 Message-ID: <3A6795EA1206904E94BEC8EF9DF109AE05D3AD3F@szxeml510-mbx.china.huawei.com> References: <20130327154149.GA3769@stefanha-thinkpad.muc.redhat.com> <67ACAA1D2D06420ABEB53D364FCB6631@gmail.com> <3A6795EA1206904E94BEC8EF9DF109AE05D381F9@szxeml510-mbx.china.huawei.com> <3A6795EA1206904E94BEC8EF9DF109AE05D38653@szxeml510-mbx.china.huawei.com> <20130404072038.GA24402@stefanha-thinkpad.redhat.com> <3A6795EA1206904E94BEC8EF9DF109AE05D3A944@szxeml510-mbx.china.huawei.com> <3A6795EA1206904E94BEC8EF9DF109AE05D3A964@szxeml510-mbx.china.huawei.com> In-Reply-To: Content-Language: zh-CN Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Subject: [Qemu-devel] =?gb2312?b?tPC4tDogILTwuLQ6ILTwuLQ6ILTwuLQ6IHF1ZXN0?= =?gb2312?b?aW9uIGFib3V0IHBlcmZvcm1hbmNlIG9mIGRhdGFwbGFuZQ==?= List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Abel Gordon , Stefan Hajnoczi Cc: "Luohao (brian)" , Haofeng , Stefan Hajnoczi , "qemu-devel@nongnu.org" , "anthony@codemonkey.ws" , =?gb2312?B?1cXA2se/?= 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from e06smtp17.uk.ibm.com ([195.75.94.113]:38604) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UP9s7-0005Td-3j for qemu-devel@nongnu.org; Mon, 08 Apr 2013 07:04:23 -0400 Received: from /spool/local by e06smtp17.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 8 Apr 2013 12:01:54 +0100 Received: from b06cxnps4075.portsmouth.uk.ibm.com (d06relay12.portsmouth.uk.ibm.com [9.149.109.197]) by d06dlp01.portsmouth.uk.ibm.com (Postfix) with ESMTP id 0489517D8020 for ; Mon, 8 Apr 2013 12:05:11 +0100 (BST) Received: from d06av12.portsmouth.uk.ibm.com (d06av12.portsmouth.uk.ibm.com [9.149.37.247]) by b06cxnps4075.portsmouth.uk.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r38B4Awi45219948 for ; Mon, 8 Apr 2013 11:04:10 GMT Received: from d06av12.portsmouth.uk.ibm.com (loopback [127.0.0.1]) by d06av12.portsmouth.uk.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r38B4ILX001068 for ; Mon, 8 Apr 2013 05:04:19 -0600 In-Reply-To: <3A6795EA1206904E94BEC8EF9DF109AE05D3AD3F@szxeml510-mbx.china.huawei.com> References: <3A6795EA1206904E94BEC8EF9DF109AE05D381F9@szxeml510-mbx.china.huawei.com> <3A6795EA1206904E94BEC8EF9DF109AE05D38653@szxeml510-mbx.china.huawei.com> <20130404072038.GA24402@stefanha-thinkpad.redhat.com> <3A6795EA1206904E94BEC8EF9DF109AE05D3A944@szxeml510-mbx.china.huawei.com> <3A6795EA1206904E94BEC8EF9DF109AE05D3A964@szxeml510-mbx.china.huawei.com> Message-ID: From: Abel Gordon Date: Mon, 8 Apr 2013 14:04:17 +0300 MIME-Version: 1.0 Content-type: text/plain; charset=US-ASCII Subject: Re: [Qemu-devel] =?gb2312?b?tPC4tDogILTwuLQ6ILTwuLQ6ILTwuLQ6IHF1ZXN0?= =?gb2312?b?aW9uIGFib3V0IHBlcmZvcm1hbmNlIG9mIGRhdGFwbGFuZQ==?= List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Zhangleiqiang Cc: "Luohao (brian)" , "anthony@codemonkey.ws" , Stefan Hajnoczi , Stefan Hajnoczi , "qemu-devel@nongnu.org" , Haofeng , =?GB2312?B?1cXA2se/?= Zhangleiqiang wrote on 08/04/2013 12:06:17 PM: > I think maybe Anthony is right. In previous benchmarks, maybe the > non-dataplane already reached the physical disk's IOPS upper limit. Yep, agree. Try to run the same benchmark in the host to see what is the bare-metal performance of your system (upper limit) and how far are dataplane and non-dataplane from this value. Note your are currently focusing on throughput but you should also consider latency and CPU utilization. > So I did another benchmark which ensures the vcpus is less than the > host's cores, but also make continuous IO pressure by one VM when > testing in the other VM. The result showed that dataplane did have > some advantage over non-dataplane. > > 1. IO Pressure Mode: 8 worker, 16K IO size, 25% Read, 100% Random, > and 50 outstanding IO > 2. Benchmark Mode: 8 worker, 16K IO size, 0% Read, 100% Random, > and 50 outstanding IO > 2. Testing Results: > a). IOPS: 178.324867 (non-dataplane) vs 230.956328 (dataplane) > b). MBPS: 2.786326 (non-dataplane) vs 3.608693 (dataplane) Note that running other VM just to "synthetically" degrade the performance of the system may cause some side effects and confuse the results (e.g. the "other" VM may stress the system differently and do more pressure when you use dataplane than when you don't use dataplane) Last thing, IMHO, you should also evaluate scalability: how dataplane and no-dataplane perform when you run multiple VMs ? For example, first 1 VM with 2 VCPUs then 2 VMs with 2 VCPUs each then 3 VMs with 2 VCPUs each ... up to 12 VMs with 2 VCPUs each It seems like you unintentionally tested what happens with 2 VMs when you added the "other" VM to create I/O pressure. From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:41363) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UP9wM-00081J-9l for qemu-devel@nongnu.org; Mon, 08 Apr 2013 07:08:49 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UP9wL-0006oX-8d for qemu-devel@nongnu.org; Mon, 08 Apr 2013 07:08:46 -0400 Received: from mail-wi0-x22a.google.com ([2a00:1450:400c:c05::22a]:57797) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UP9wL-0006oR-2n for qemu-devel@nongnu.org; Mon, 08 Apr 2013 07:08:45 -0400 Received: by mail-wi0-f170.google.com with SMTP id hm11so3672617wib.3 for ; Mon, 08 Apr 2013 04:08:44 -0700 (PDT) Date: Mon, 8 Apr 2013 13:08:41 +0200 From: Stefan Hajnoczi Message-ID: <20130408110841.GE12076@stefanha-thinkpad.redhat.com> References: <20130327154149.GA3769@stefanha-thinkpad.muc.redhat.com> <67ACAA1D2D06420ABEB53D364FCB6631@gmail.com> <3A6795EA1206904E94BEC8EF9DF109AE05D381F9@szxeml510-mbx.china.huawei.com> <874nfio2pw.fsf@codemonkey.ws> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <874nfio2pw.fsf@codemonkey.ws> Subject: Re: [Qemu-devel] question about performance of dataplane List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Anthony Liguori Cc: Zhangleiqiang , "Luohao (brian)" , Haofeng , "qemu-devel@nongnu.org" , "stefanha@redhat.com" , leiqzhang On Sun, Apr 07, 2013 at 09:05:47AM -0500, Anthony Liguori wrote: > Zhangleiqiang writes: > > > Hi, Stefan： > > > > I have done some testing to compare the performance of dataplane and non-dataplane. But the result did not meet my expectations, the performance of disk with dataplane enabled did not have advantage over non-dataplane. > > > > The following contains the environment info and testing results. Does my testing method or testing environment have something wrong ? Could you give me some advice? I can provide more information if need. > > > > > > 1. Environment: > > a). Qemu 1.4 master branch > > b). kernel: 3.5.0-2.fc17.x86_64 > > c). virtual disks location: the same local SATA harddisk > > with ext4 fs > > I doubt you'll see any performance difference with a single SATA drive. > There's no real parallelism possible as you have exactly one spindle > available. Sorry for the delay, catching up on emails after my Easter vacation. I agree with Anthony here. It seems your benchmark configuration is bottlenecked below the point where data plane makes a difference. Stefan From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:43560) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UPA2f-0004ba-O5 for qemu-devel@nongnu.org; Mon, 08 Apr 2013 07:15:24 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UPA2X-0001G1-Bi for qemu-devel@nongnu.org; Mon, 08 Apr 2013 07:15:17 -0400 Received: from szxga02-in.huawei.com ([119.145.14.65]:44084) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UPA2W-0001Ey-OR for qemu-devel@nongnu.org; Mon, 08 Apr 2013 07:15:09 -0400 From: Zhangleiqiang Date: Mon, 8 Apr 2013 11:13:50 +0000 Message-ID: <3A6795EA1206904E94BEC8EF9DF109AE05D3BF8D@szxeml510-mbx.china.huawei.com> References: <3A6795EA1206904E94BEC8EF9DF109AE05D381F9@szxeml510-mbx.china.huawei.com> <3A6795EA1206904E94BEC8EF9DF109AE05D38653@szxeml510-mbx.china.huawei.com> <20130404072038.GA24402@stefanha-thinkpad.redhat.com> <3A6795EA1206904E94BEC8EF9DF109AE05D3A944@szxeml510-mbx.china.huawei.com> <3A6795EA1206904E94BEC8EF9DF109AE05D3A964@szxeml510-mbx.china.huawei.com> In-Reply-To: Content-Language: zh-CN Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Subject: Re: [Qemu-devel] =?gb2312?b?tPC4tDogILTwuLQ6ILTwuLQ6ILTwuLQ6IHF1ZXN0?= =?gb2312?b?aW9uIGFib3V0IHBlcmZvcm1hbmNlIG9mIGRhdGFwbGFuZQ==?= List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Abel Gordon Cc: "Luohao (brian)" , "anthony@codemonkey.ws" , Stefan Hajnoczi , Stefan Hajnoczi , "qemu-devel@nongnu.org" , Haofeng , =?gb2312?B?1cXA2se/?= DQoNCj4gLS0tLS1PcmlnaW5hbCBNZXNzYWdlLS0tLS0NCj4gRnJvbTogQWJlbCBHb3Jkb24gW21h aWx0bzpBQkVMR0BpbC5pYm0uY29tXQ0KPiBTZW50OiBNb25kYXksIEFwcmlsIDA4LCAyMDEzIDc6 MDQgUE0NCj4gVG86IFpoYW5nbGVpcWlhbmcNCj4gQ2M6IGFudGhvbnlAY29kZW1vbmtleS53czsg THVvaGFvIChicmlhbik7IEhhb2Zlbmc7INXFwNrHvzsNCj4gcWVtdS1kZXZlbEBub25nbnUub3Jn OyBTdGVmYW4gSGFqbm9jemk7IFN0ZWZhbiBIYWpub2N6aQ0KPiBTdWJqZWN0OiBSZTogtPC4tDog W1FlbXUtZGV2ZWxdILTwuLQ6ILTwuLQ6ILTwuLQ6IHF1ZXN0aW9uIGFib3V0DQo+IHBlcmZvcm1h bmNlIG9mIGRhdGFwbGFuZQ0KPiANCj4gWmhhbmdsZWlxaWFuZyA8emhhbmdsZWlxaWFuZ0BodWF3 ZWkuY29tPiB3cm90ZSBvbiAwOC8wNC8yMDEzIDEyOjA2OjE3DQo+IFBNOg0KPiANCj4gPiBJIHRo aW5rIG1heWJlIEFudGhvbnkgaXMgcmlnaHQuIEluIHByZXZpb3VzIGJlbmNobWFya3MsIG1heWJl IHRoZQ0KPiA+IG5vbi1kYXRhcGxhbmUgYWxyZWFkeSByZWFjaGVkIHRoZSBwaHlzaWNhbCBkaXNr J3MgSU9QUyB1cHBlciBsaW1pdC4NCj4gDQo+IFllcCwgYWdyZWUuIFRyeSB0byBydW4gdGhlIHNh bWUgYmVuY2htYXJrIGluIHRoZSBob3N0IHRvIHNlZQ0KPiB3aGF0IGlzIHRoZSBiYXJlLW1ldGFs IHBlcmZvcm1hbmNlIG9mIHlvdXIgc3lzdGVtICh1cHBlciBsaW1pdCkNCj4gYW5kIGhvdyBmYXIg YXJlIGRhdGFwbGFuZSBhbmQgbm9uLWRhdGFwbGFuZSBmcm9tIHRoaXMgdmFsdWUuDQo+IE5vdGUg eW91ciBhcmUgY3VycmVudGx5IGZvY3VzaW5nIG9uIHRocm91Z2hwdXQgYnV0IHlvdSBzaG91bGQg YWxzbw0KPiBjb25zaWRlciBsYXRlbmN5IGFuZCBDUFUgdXRpbGl6YXRpb24uDQo+IA0KPiA+IFNv IEkgZGlkIGFub3RoZXIgYmVuY2htYXJrIHdoaWNoIGVuc3VyZXMgdGhlIHZjcHVzIGlzIGxlc3Mg dGhhbiB0aGUNCj4gPiBob3N0J3MgY29yZXMsIGJ1dCBhbHNvIG1ha2UgY29udGludW91cyBJTyBw cmVzc3VyZSBieSBvbmUgVk0gd2hlbg0KPiA+IHRlc3RpbmcgaW4gdGhlIG90aGVyIFZNLiBUaGUg cmVzdWx0IHNob3dlZCB0aGF0IGRhdGFwbGFuZSBkaWQgaGF2ZQ0KPiA+IHNvbWUgYWR2YW50YWdl IG92ZXIgbm9uLWRhdGFwbGFuZS4NCj4gPg0KPiA+IDEuIElPIFByZXNzdXJlIE1vZGU6ICA4IHdv cmtlciwgMTZLIElPIHNpemUsIDI1JSBSZWFkLCAxMDAlIFJhbmRvbSwNCj4gPiBhbmQgNTAgb3V0 c3RhbmRpbmcgSU8NCj4gPiAyLiBCZW5jaG1hcmsgTW9kZTogIDggd29ya2VyLCAxNksgSU8gc2l6 ZSwgMCUgUmVhZCwgIDEwMCUgUmFuZG9tLA0KPiA+IGFuZCA1MCBvdXRzdGFuZGluZyBJTw0KPiA+ IDIuIFRlc3RpbmcgUmVzdWx0czoNCj4gPiAgICBhKS4gSU9QUzogICAgIDE3OC4zMjQ4NjcgKG5v bi1kYXRhcGxhbmUpICB2cyAgMjMwLjk1NjMyOA0KPiAoZGF0YXBsYW5lKQ0KPiA+ICAgIGIpLiBN QlBTOiAgICAgMi43ODYzMjYgKG5vbi1kYXRhcGxhbmUpICB2cyAgMy42MDg2OTMgKGRhdGFwbGFu ZSkNCj4gDQo+IE5vdGUgdGhhdCBydW5uaW5nIG90aGVyIFZNIGp1c3QgdG8gInN5bnRoZXRpY2Fs bHkiIGRlZ3JhZGUgdGhlDQo+IHBlcmZvcm1hbmNlIG9mIHRoZSBzeXN0ZW0gbWF5IGNhdXNlIHNv bWUgc2lkZSBlZmZlY3RzIGFuZCBjb25mdXNlIHRoZQ0KPiByZXN1bHRzIChlLmcuIHRoZSAib3Ro ZXIiIFZNIG1heSBzdHJlc3MgdGhlIHN5c3RlbSBkaWZmZXJlbnRseSBhbmQNCj4gZG8gbW9yZSBw cmVzc3VyZSB3aGVuIHlvdSB1c2UgZGF0YXBsYW5lIHRoYW4gd2hlbiB5b3UgZG9uJ3QgdXNlDQo+ IGRhdGFwbGFuZSkNCj4gDQoNCkkgdGhpbmsgZG8gbXVsdGlwbGUgYmVuY2htYXJrcyB3aXRoIHRo ZSBzYW1lIHNpdHVhdGlvbiBhbmQgY2FsYyB0aGUgYXZlcmFnZSB2YWx1ZSB3aWxsIGVsaW1pbmF0 ZSB0aGUgInNpZGUgZWZmZWN0cyIuDQoNCj4gTGFzdCB0aGluZywgSU1ITywgeW91IHNob3VsZCBh bHNvIGV2YWx1YXRlIHNjYWxhYmlsaXR5Og0KPiBob3cgZGF0YXBsYW5lIGFuZCBuby1kYXRhcGxh bmUgcGVyZm9ybSAgd2hlbiB5b3UgcnVuIG11bHRpcGxlIFZNcyA/DQo+IA0KPiBGb3IgZXhhbXBs ZSwNCj4gICBmaXJzdCAgMSBWTSAgd2l0aCAyIFZDUFVzDQo+ICAgdGhlbiAgIDIgVk1zIHdpdGgg MiBWQ1BVcyBlYWNoDQo+ICAgdGhlbiAgIDMgVk1zIHdpdGggMiBWQ1BVcyBlYWNoDQo+ICAgLi4u DQo+ICAgdXAgdG8gMTIgVk1zIHdpdGggMiBWQ1BVcyBlYWNoDQo+IA0KPiBJdCBzZWVtcyBsaWtl IHlvdSB1bmludGVudGlvbmFsbHkgdGVzdGVkIHdoYXQgaGFwcGVucyB3aXRoIDIgVk1zIHdoZW4N Cj4geW91IGFkZGVkIHRoZSAib3RoZXIiIFZNIHRvIGNyZWF0ZSBJL08gcHJlc3N1cmUuDQoNCklu ZGVlZCwgdGhlIGZhY3QgSSB1c2VkIDIgVk1zIGluIHByZXZpb3VzIGJlbmNobWFyayBpcyB0byBl bnN1cmUgdGhlIHZjcHVzIGlzIGxlc3MgdGhhbiB0aGUgaG9zdCdzIGNvcmVzLCBlZywgZWFjaCB2 bSBoYWQgOCB2cHVzLiANClRoYW5rcyBmb3IgeW91ciBhZHZpY2UsIEkgd2lsbCBldmFsdWF0ZSB0 aGUgc2NhbGFiaWxpdHksICA6KQ0KDQo= From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:46992) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UPAIT-0000lA-T8 for qemu-devel@nongnu.org; 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Violators will be prosecuted for from ; Mon, 8 Apr 2013 12:28:04 +0100 Received: from b06cxnps3075.portsmouth.uk.ibm.com (d06relay10.portsmouth.uk.ibm.com [9.149.109.195]) by d06dlp01.portsmouth.uk.ibm.com (Postfix) with ESMTP id 0B1D717D8024 for ; Mon, 8 Apr 2013 12:32:13 +0100 (BST) Received: from d06av09.portsmouth.uk.ibm.com (d06av09.portsmouth.uk.ibm.com [9.149.37.250]) by b06cxnps3075.portsmouth.uk.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r38BVCsP48234526 for ; Mon, 8 Apr 2013 11:31:12 GMT Received: from d06av09.portsmouth.uk.ibm.com (loopback [127.0.0.1]) by d06av09.portsmouth.uk.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r38BVL3q031173 for ; Mon, 8 Apr 2013 05:31:21 -0600 In-Reply-To: <3A6795EA1206904E94BEC8EF9DF109AE05D3BF8D@szxeml510-mbx.china.huawei.com> References: <3A6795EA1206904E94BEC8EF9DF109AE05D38653@szxeml510-mbx.china.huawei.com> <20130404072038.GA24402@stefanha-thinkpad.redhat.com> <3A6795EA1206904E94BEC8EF9DF109AE05D3A944@szxeml510-mbx.china.huawei.com> <3A6795EA1206904E94BEC8EF9DF109AE05D3A964@szxeml510-mbx.china.huawei.com> Message-ID: From: Abel Gordon Date: Mon, 8 Apr 2013 14:31:19 +0300 MIME-Version: 1.0 Content-type: text/plain; charset=US-ASCII Subject: Re: [Qemu-devel] =?gb2312?b?tPC4tDogILTwuLQ6ILTwuLQ6ILTwuLQ6IHF1ZXN0?= =?gb2312?b?aW9uIGFib3V0IHBlcmZvcm1hbmNlIG9mIGRhdGFwbGFuZQ==?= List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Zhangleiqiang Cc: "Luohao (brian)" , Haofeng , Stefan Hajnoczi , "qemu-devel@nongnu.org" , Stefan Hajnoczi , "anthony@codemonkey.ws" , =?GB2312?B?1cXA2se/?= Zhangleiqiang wrote on 08/04/2013 02:13:50 PM: > I think do multiple benchmarks with the same situation and calc the > average value will eliminate the "side effects". Calculating the average of multiple benchmarks may not solve the issue. For example, if for the dataplane scenario the "other" VM do X IOPs and for no-dataplane the "other" VM do Y IOPs then you may not be comparing apples to apples (unless you consider the "other" VM as part of the results). > > > Last thing, IMHO, you should also evaluate scalability: > > how dataplane and no-dataplane perform when you run multiple VMs ? > > > > For example, > > first 1 VM with 2 VCPUs > > then 2 VMs with 2 VCPUs each > > then 3 VMs with 2 VCPUs each > > ... > > up to 12 VMs with 2 VCPUs each > > > > It seems like you unintentionally tested what happens with 2 VMs when > > you added the "other" VM to create I/O pressure. > > Indeed, the fact I used 2 VMs in previous benchmark is to ensure the > vcpus is less than the host's cores, eg, each vm had 8 vpus. > Thanks for your advice, I will evaluate the scalability, :) Thanks, I am looking forward for the results :) From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:42729) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UPBiU-0005jm-8b for qemu-devel@nongnu.org; Mon, 08 Apr 2013 09:02:45 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UPBiI-0000jl-EZ for qemu-devel@nongnu.org; Mon, 08 Apr 2013 09:02:34 -0400 Received: from szxga02-in.huawei.com ([119.145.14.65]:4385) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UPBiH-0000io-Rf for qemu-devel@nongnu.org; Mon, 08 Apr 2013 09:02:22 -0400 From: Zhangleiqiang Date: Mon, 8 Apr 2013 13:01:53 +0000 Message-ID: <3A6795EA1206904E94BEC8EF9DF109AE05D3C04A@szxeml510-mbx.china.huawei.com> References: <20130327154149.GA3769@stefanha-thinkpad.muc.redhat.com> <67ACAA1D2D06420ABEB53D364FCB6631@gmail.com> <3A6795EA1206904E94BEC8EF9DF109AE05D381F9@szxeml510-mbx.china.huawei.com> <874nfio2pw.fsf@codemonkey.ws> <20130408110841.GE12076@stefanha-thinkpad.redhat.com> In-Reply-To: <20130408110841.GE12076@stefanha-thinkpad.redhat.com> Content-Language: zh-CN Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 MIME-Version: 1.0 Subject: Re: [Qemu-devel] question about performance of dataplane List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Stefan Hajnoczi , Anthony Liguori Cc: Zhangleiqiang , "Luohao (brian)" , Haofeng , "qemu-devel@nongnu.org" , "stefanha@redhat.com" , leiqzhang DQo+IC0tLS0tT3JpZ2luYWwgTWVzc2FnZS0tLS0tDQo+IEZyb206IFN0ZWZhbiBIYWpub2N6aSBb bWFpbHRvOnN0ZWZhbmhhQGdtYWlsLmNvbV0NCj4gU2VudDogTW9uZGF5LCBBcHJpbCAwOCwgMjAx MyA3OjA5IFBNDQo+IA0KPiBPbiBTdW4sIEFwciAwNywgMjAxMyBhdCAwOTowNTo0N0FNIC0wNTAw LCBBbnRob255IExpZ3Vvcmkgd3JvdGU6DQo+ID4gWmhhbmdsZWlxaWFuZyA8emhhbmdsZWlxaWFu Z0BodWF3ZWkuY29tPiB3cml0ZXM6DQo+ID4NCj4gPiA+IDEuIEVudmlyb25tZW50Og0KPiA+ID4g CWEpLiBRZW11IDEuNCBtYXN0ZXIgYnJhbmNoDQo+ID4gPiAJYikuIGtlcm5lbDogIDMuNS4wLTIu ZmMxNy54ODZfNjQNCj4gPiA+ICAgICAgICAgIGMpLiB2aXJ0dWFsIGRpc2tzIGxvY2F0aW9uOiAg dGhlIHNhbWUgbG9jYWwgU0FUQSBoYXJkZGlzaw0KPiA+ID4gCXdpdGggZXh0NCBmcw0KPiA+DQo+ ID4gSSBkb3VidCB5b3UnbGwgc2VlIGFueSBwZXJmb3JtYW5jZSBkaWZmZXJlbmNlIHdpdGggYSBz aW5nbGUgU0FUQSBkcml2ZS4NCj4gPiBUaGVyZSdzIG5vIHJlYWwgcGFyYWxsZWxpc20gcG9zc2li bGUgYXMgeW91IGhhdmUgZXhhY3RseSBvbmUgc3BpbmRsZQ0KPiA+IGF2YWlsYWJsZS4NCj4gDQo+ IFNvcnJ5IGZvciB0aGUgZGVsYXksIGNhdGNoaW5nIHVwIG9uIGVtYWlscyBhZnRlciBteSBFYXN0 ZXIgdmFjYXRpb24uDQo+IA0KPiBJIGFncmVlIHdpdGggQW50aG9ueSBoZXJlLiAgSXQgc2VlbXMg eW91ciBiZW5jaG1hcmsgY29uZmlndXJhdGlvbiBpcw0KPiBib3R0bGVuZWNrZWQgYmVsb3cgdGhl IHBvaW50IHdoZXJlIGRhdGEgcGxhbmUgbWFrZXMgYSBkaWZmZXJlbmNlLg0KPiANCg0KSSdtIG5v dCB1bmRlcnN0YW5kIHdoYXQgdGhlICJubyByZWFsIHBhcmFsbGVsaXNtIHBvc3NpYmxlIGFzIHlv dSBoYXZlIGV4YWN0bHkgb25lIHNwaW5kbGUiIG1lYW5zLiBEb3NlIGl0IG1lYW5zIEkgc2hvdWxk IHB1dCBvcyB2ZGlzayBvbnRvIGEgZGlmZmVyZW50IGhhcmRkaXNrIGZyb20gdGhlIGRhdGEgdmRp c2tzPyBPciBpdCBtZWFucyBJIHNob3VsZCBwdXQgZGF0YSB2ZGlzayBvbiBkaWZmZXJlbnQgaGFy ZGRpc2tzPyAgDQoNCkJ1dCB1bmRlciB0aGUgYmVuY2htYXJrIHNjZW5hcmlvIG1lbnRpb25lZCBh Ym92ZSwgZXZlbiB0aGUgb3MgdmRpc2sgYW5kIGRhdGEgdmRpc2tzIHdhcyBvbiB0aGUgc2FtZSBo YXJkZGlzaywgdGhlIElPTWV0ZXIgb25seSBnZW5lcmF0ZWQgSU8gdG8gZGF0YSB2ZGlza3M7IEJl c2lkZXMsIHRoZSBiZW5jaG1hcmsgb2YgZGF0YXBsYW5lIGRpc2sgYW5kIG5vbi1kYXRhcGxhbmUg ZGlzayB3YXMgZGlkIGNvbnRpbnVvdXNseSBvdGhlciB0aGFuIHNpbXVsdGFuZW91c2x5Lg0KDQpJ IGhhdmUgZmluaXNoZWQgc29tZSBiZW5jaG1hcmtzIHRoZXNlIGRheXMsIGFuZCB0aGUgcmVzdWx0 cyBoYXZlIGFscmVhZHkgYmVlbiBzZW50IHRvIHRoZSBtYWlsIGxpc3QuIEl0IHNlZW1zIHRoZSBk YXRhcGxhbmUgaGFzIGFkdmFudGFnZSB3aGVuIHRoZXJlIGlzIElPIGNvbXBldGl0aW9uLiBJIGd1 ZXNzIG1heWJlIHRoZSBub24tZGF0YXBsYW5lIGFscmVhZHkgcmVhY2hlZCB0aGUgcGh5c2ljYWwg ZGlzaydzIElPUFMgdXBwZXIgbGltaXQgaW4gdGhlIHNjZW5hcmlvIGFib3ZlIHNvIHRoYXQgZGF0 YSBwbGFuZSBkaWRuJ3QgbWFrZSBhIGRpZmZlcmVuY2U/IA0KDQotLS0tLS0tLS0tDQpMZWlxemhh bmcNCg0KQmVzdCBSZWdhcmRzDQo= From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:39364) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UPX38-0002oE-1C for qemu-devel@nongnu.org; Tue, 09 Apr 2013 07:49:21 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UPX35-0000Mz-Cz for qemu-devel@nongnu.org; Tue, 09 Apr 2013 07:49:17 -0400 Received: from mx1.redhat.com ([209.132.183.28]:20798) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UPX35-0000Ms-51 for qemu-devel@nongnu.org; Tue, 09 Apr 2013 07:49:15 -0400 Date: Tue, 9 Apr 2013 13:49:08 +0200 From: Stefan Hajnoczi Message-ID: <20130409114908.GA12434@stefanha-thinkpad.redhat.com> References: <20130327154149.GA3769@stefanha-thinkpad.muc.redhat.com> <67ACAA1D2D06420ABEB53D364FCB6631@gmail.com> <3A6795EA1206904E94BEC8EF9DF109AE05D381F9@szxeml510-mbx.china.huawei.com> <874nfio2pw.fsf@codemonkey.ws> <20130408110841.GE12076@stefanha-thinkpad.redhat.com> <3A6795EA1206904E94BEC8EF9DF109AE05D3C04A@szxeml510-mbx.china.huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3A6795EA1206904E94BEC8EF9DF109AE05D3C04A@szxeml510-mbx.china.huawei.com> Subject: Re: [Qemu-devel] question about performance of dataplane List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Zhangleiqiang Cc: "Luohao (brian)" , Haofeng , Stefan Hajnoczi , "qemu-devel@nongnu.org" , Anthony Liguori , leiqzhang On Mon, Apr 08, 2013 at 01:01:53PM +0000, Zhangleiqiang wrote: > I guess maybe the non-dataplane already reached the physical disk's IOPS upper limit in the scenario above so that data plane didn't make a difference? Yes. Stefan