From: Michael Tokarev <mjt@tls.msk.ru>
To: Richard Davies <richard@arachsys.com>
Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org
Subject: Re: Windows slow boot
Date: Tue, 18 Sep 2012 19:12:40 +0400 [thread overview]
Message-ID: <50588F68.3060708@msgid.tls.msk.ru> (raw)
In-Reply-To: <20120816104727.GA17166@alpha.arachsys.com>
On 16.08.2012 14:47, Richard Davies wrote:
> http://marc.info/?l=qemu-devel&m=134304194329745
>
>
> We have been experiencing this problem for a while now too, using qemu-kvm
> (currently at 1.1.1).
>
> Unfortunately, hv_relaxed doesn't seem to fix it. The following command line
> produces the issue:
>
> qemu-kvm -nodefaults -m 4096 -smp 8 -cpu host,hv_relaxed -vga cirrus -usbdevice tablet -vnc :99 -monitor stdio -hda test.img
Just one question: did you try explicitly using hugepages?
For that,
- reserve some amount of hugepages (echo something > /proc/sys/vm/nr_hugepages),
- mount hugetlbfs to somewhere, like, /dev/hugetlbfs
- use -mem-path=/dev/hugetlbfs qemu option
This may also reduce your lock contention. Sure, hugepages have
some minus sides too, but I think it is worth to try anyway -
for a single VM or for whole lot of VMs (for that you'll have
to reserve much more memory after host boot).
/mjt
WARNING: multiple messages have this Message-ID (diff)
From: Michael Tokarev <mjt@tls.msk.ru>
To: Richard Davies <richard@arachsys.com>
Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org
Subject: Re: [Qemu-devel] Windows slow boot
Date: Tue, 18 Sep 2012 19:12:40 +0400 [thread overview]
Message-ID: <50588F68.3060708@msgid.tls.msk.ru> (raw)
In-Reply-To: <20120816104727.GA17166@alpha.arachsys.com>
On 16.08.2012 14:47, Richard Davies wrote:
> http://marc.info/?l=qemu-devel&m=134304194329745
>
>
> We have been experiencing this problem for a while now too, using qemu-kvm
> (currently at 1.1.1).
>
> Unfortunately, hv_relaxed doesn't seem to fix it. The following command line
> produces the issue:
>
> qemu-kvm -nodefaults -m 4096 -smp 8 -cpu host,hv_relaxed -vga cirrus -usbdevice tablet -vnc :99 -monitor stdio -hda test.img
Just one question: did you try explicitly using hugepages?
For that,
- reserve some amount of hugepages (echo something > /proc/sys/vm/nr_hugepages),
- mount hugetlbfs to somewhere, like, /dev/hugetlbfs
- use -mem-path=/dev/hugetlbfs qemu option
This may also reduce your lock contention. Sure, hugepages have
some minus sides too, but I think it is worth to try anyway -
for a single VM or for whole lot of VMs (for that you'll have
to reserve much more memory after host boot).
/mjt
next prev parent reply other threads:[~2012-09-18 15:12 UTC|newest]
Thread overview: 101+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-16 10:47 Windows slow boot: contractor wanted Richard Davies
2012-08-16 10:47 ` [Qemu-devel] " Richard Davies
2012-08-16 11:39 ` Avi Kivity
2012-08-16 11:39 ` [Qemu-devel] " Avi Kivity
2012-08-17 12:36 ` Richard Davies
2012-08-17 12:36 ` [Qemu-devel] " Richard Davies
2012-08-17 13:02 ` Robert Vineyard
2012-08-17 13:02 ` [Qemu-devel] " Robert Vineyard
2012-08-18 14:44 ` Richard Davies
2012-08-18 14:44 ` [Qemu-devel] " Richard Davies
2012-08-19 5:02 ` Brian Jackson
2012-08-19 5:02 ` [Qemu-devel] " Brian Jackson
2012-08-20 8:16 ` Richard Davies
2012-08-20 8:16 ` [Qemu-devel] " Richard Davies
2012-08-19 8:40 ` Avi Kivity
2012-08-19 8:40 ` [Qemu-devel] " Avi Kivity
2012-08-19 8:51 ` Richard Davies
2012-08-19 8:51 ` [Qemu-devel] " Richard Davies
2012-08-19 14:04 ` Avi Kivity
2012-08-19 14:04 ` [Qemu-devel] " Avi Kivity
2012-08-20 13:56 ` Richard Davies
2012-08-20 13:56 ` [Qemu-devel] " Richard Davies
2012-08-21 9:00 ` Avi Kivity
2012-08-21 9:00 ` [Qemu-devel] " Avi Kivity
2012-08-21 15:21 ` Richard Davies
2012-08-21 15:21 ` [Qemu-devel] " Richard Davies
2012-08-21 15:39 ` Troy Benjegerdes
2012-08-21 15:39 ` Troy Benjegerdes
2012-08-22 9:08 ` Avi Kivity
2012-08-22 9:08 ` [Qemu-devel] " Avi Kivity
2012-08-22 12:40 ` Richard Davies
2012-08-22 12:40 ` [Qemu-devel] " Richard Davies
2012-08-22 12:44 ` Avi Kivity
2012-08-22 12:44 ` [Qemu-devel] " Avi Kivity
2012-08-22 14:41 ` Richard Davies
2012-08-22 14:41 ` [Qemu-devel] " Richard Davies
2012-08-22 14:53 ` Avi Kivity
2012-08-22 14:53 ` [Qemu-devel] " Avi Kivity
2012-08-22 15:26 ` Richard Davies
2012-08-22 15:26 ` [Qemu-devel] " Richard Davies
2012-08-22 17:22 ` Troy Benjegerdes
2012-08-22 17:22 ` Troy Benjegerdes
2012-08-25 17:51 ` Richard Davies
2012-08-25 17:51 ` Richard Davies
2012-08-22 15:21 ` Rik van Riel
2012-08-22 15:21 ` [Qemu-devel] " Rik van Riel
2012-08-22 15:34 ` Richard Davies
2012-08-22 15:34 ` [Qemu-devel] " Richard Davies
2012-08-25 17:45 ` Richard Davies
2012-08-25 17:45 ` [Qemu-devel] " Richard Davies
2012-08-25 18:11 ` Rik van Riel
2012-08-25 18:11 ` [Qemu-devel] " Rik van Riel
2012-08-26 10:58 ` Richard Davies
2012-08-26 10:58 ` [Qemu-devel] " Richard Davies
2012-09-06 9:20 ` Richard Davies
2012-09-06 9:20 ` [Qemu-devel] " Richard Davies
2012-09-12 10:56 ` Windows VM slow boot Richard Davies
2012-09-12 10:56 ` [Qemu-devel] " Richard Davies
2012-09-12 10:56 ` Richard Davies
2012-09-12 12:25 ` Mel Gorman
2012-09-12 12:25 ` [Qemu-devel] " Mel Gorman
2012-09-12 12:25 ` Mel Gorman
2012-09-12 16:46 ` Richard Davies
2012-09-12 16:46 ` [Qemu-devel] " Richard Davies
2012-09-12 16:46 ` Richard Davies
2012-09-13 9:50 ` Mel Gorman
2012-09-13 9:50 ` [Qemu-devel] " Mel Gorman
2012-09-13 9:50 ` Mel Gorman
2012-09-13 19:47 ` [PATCH 1/2] Revert "mm: have order > 0 compaction start near a pageblock with free pages" Rik van Riel
2012-09-13 19:47 ` [Qemu-devel] " Rik van Riel
2012-09-13 19:47 ` Rik van Riel
2012-09-13 19:48 ` [PATCH 2/2] make the compaction "skip ahead" logic robust Rik van Riel
2012-09-13 19:48 ` [Qemu-devel] " Rik van Riel
2012-09-13 19:48 ` Rik van Riel
2012-09-13 19:54 ` [PATCH -v2 " Rik van Riel
2012-09-13 19:54 ` [Qemu-devel] " Rik van Riel
2012-09-13 19:54 ` Rik van Riel
2012-09-15 15:55 ` Richard Davies
2012-09-15 15:55 ` [Qemu-devel] " Richard Davies
2012-09-15 15:55 ` Richard Davies
2012-09-16 19:12 ` Richard Davies
2012-09-16 19:12 ` [Qemu-devel] " Richard Davies
2012-09-17 12:26 ` Mel Gorman
2012-09-17 12:26 ` [Qemu-devel] " Mel Gorman
2012-09-18 8:14 ` Richard Davies
2012-09-18 8:14 ` [Qemu-devel] " Richard Davies
2012-09-18 11:21 ` Mel Gorman
2012-09-18 11:21 ` [Qemu-devel] " Mel Gorman
2012-09-18 11:21 ` Mel Gorman
2012-09-18 17:58 ` Richard Davies
2012-09-18 17:58 ` [Qemu-devel] " Richard Davies
2012-09-17 13:50 ` Rik van Riel
2012-09-17 13:50 ` [Qemu-devel] " Rik van Riel
2012-09-17 14:07 ` Mel Gorman
2012-09-17 14:07 ` [Qemu-devel] " Mel Gorman
2012-09-17 14:07 ` Mel Gorman
2012-08-16 14:10 ` Windows slow boot: contractor wanted Benoît Canet
2012-08-16 14:10 ` [Qemu-devel] " Benoît Canet
2012-08-16 15:53 ` Troy Benjegerdes
2012-09-18 15:12 ` Michael Tokarev [this message]
2012-09-18 15:12 ` [Qemu-devel] Windows slow boot Michael Tokarev
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=50588F68.3060708@msgid.tls.msk.ru \
--to=mjt@tls.msk.ru \
--cc=kvm@vger.kernel.org \
--cc=qemu-devel@nongnu.org \
--cc=richard@arachsys.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.