From: Paolo Bonzini <pbonzini@redhat.com>
To: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Cc: zwanp@cn.ibm.com, linuxram@us.ibm.com, qemu-devel@nongnu.org,
virtualization@lists.linux-foundation.org,
Cong Meng <mc@linux.vnet.ibm.com>
Subject: Re: [PATCH 1/2 v1] blkdrv: Add queue limits parameters for sg block drive
Date: Wed, 22 Aug 2012 16:13:44 +0200 [thread overview]
Message-ID: <5034E918.4030305@redhat.com> (raw)
In-Reply-To: <20120822131348.GA3512@stefanha-thinkpad.localdomain>
Il 22/08/2012 15:13, Stefan Hajnoczi ha scritto:
> http://lists.gnu.org/archive/html/qemu-devel/2010-12/msg01741.html
>
> "This is a real problem in practice. IE. the USB CD-ROM on this POWER7
> blade limits transfers to 0x1e000 bytes for example and the Linux "sr"
> driver on the guest is going to try to give me bigger requests than that
> if I don't start limiting them, which will cause all sort of errors."
>
> It cannot be fixed for emulated SCSI HBAs in general but it can for
> virtio-scsi.
For disks, this should be fixed simply by using scsi-block instead of
scsi-generic.
CD-ROMs are indeed more complicated because burning CDs cannot be done
with syscalls. :/
Paolo
WARNING: multiple messages have this Message-ID (diff)
From: Paolo Bonzini <pbonzini@redhat.com>
To: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Cc: Stefan Hajnoczi <stefanha@gmail.com>,
zwanp@cn.ibm.com, linuxram@us.ibm.com, qemu-devel@nongnu.org,
virtualization@lists.linux-foundation.org,
Cong Meng <mc@linux.vnet.ibm.com>
Subject: Re: [Qemu-devel] [PATCH 1/2 v1] blkdrv: Add queue limits parameters for sg block drive
Date: Wed, 22 Aug 2012 16:13:44 +0200 [thread overview]
Message-ID: <5034E918.4030305@redhat.com> (raw)
In-Reply-To: <20120822131348.GA3512@stefanha-thinkpad.localdomain>
Il 22/08/2012 15:13, Stefan Hajnoczi ha scritto:
> http://lists.gnu.org/archive/html/qemu-devel/2010-12/msg01741.html
>
> "This is a real problem in practice. IE. the USB CD-ROM on this POWER7
> blade limits transfers to 0x1e000 bytes for example and the Linux "sr"
> driver on the guest is going to try to give me bigger requests than that
> if I don't start limiting them, which will cause all sort of errors."
>
> It cannot be fixed for emulated SCSI HBAs in general but it can for
> virtio-scsi.
For disks, this should be fixed simply by using scsi-block instead of
scsi-generic.
CD-ROMs are indeed more complicated because burning CDs cannot be done
with syscalls. :/
Paolo
next prev parent reply other threads:[~2012-08-22 14:13 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-21 8:23 [PATCH 1/2 v1] blkdrv: Add queue limits parameters for sg block drive Cong Meng
2012-08-21 8:23 ` [Qemu-devel] " Cong Meng
2012-08-21 8:23 ` [PATCH 2/2 v1] virtio-scsi: set per-LUN queue limits for sg devices Cong Meng
2012-08-21 8:23 ` [Qemu-devel] " Cong Meng
2012-08-21 9:56 ` Stefan Hajnoczi
2012-08-21 9:56 ` Stefan Hajnoczi
2012-08-21 8:48 ` [PATCH 1/2 v1] blkdrv: Add queue limits parameters for sg block drive Paolo Bonzini
2012-08-21 8:48 ` [Qemu-devel] " Paolo Bonzini
2012-08-21 9:41 ` Cong Meng
2012-08-21 9:41 ` [Qemu-devel] " Cong Meng
2012-08-21 9:52 ` Stefan Hajnoczi
2012-08-21 9:52 ` [Qemu-devel] " Stefan Hajnoczi
2012-08-21 10:14 ` Paolo Bonzini
2012-08-21 10:14 ` [Qemu-devel] " Paolo Bonzini
2012-08-22 11:04 ` Cong Meng
2012-08-22 11:04 ` [Qemu-devel] " Cong Meng
2012-08-22 12:09 ` Paolo Bonzini
2012-08-22 12:09 ` [Qemu-devel] " Paolo Bonzini
2012-08-22 13:13 ` Stefan Hajnoczi
2012-08-22 13:13 ` [Qemu-devel] " Stefan Hajnoczi
2012-08-22 14:13 ` Paolo Bonzini [this message]
2012-08-22 14:13 ` Paolo Bonzini
2012-08-23 9:31 ` Cong Meng
2012-08-23 9:31 ` [Qemu-devel] " Cong Meng
2012-08-23 10:03 ` Paolo Bonzini
2012-08-23 10:03 ` [Qemu-devel] " Paolo Bonzini
2012-08-23 10:08 ` Stefan Hajnoczi
2012-08-23 10:08 ` [Qemu-devel] " Stefan Hajnoczi
2012-08-23 10:52 ` Paolo Bonzini
2012-08-23 10:52 ` [Qemu-devel] " Paolo Bonzini
2012-08-23 12:08 ` Stefan Hajnoczi
2012-08-23 12:08 ` [Qemu-devel] " Stefan Hajnoczi
2012-08-24 0:45 ` Nicholas A. Bellinger
2012-08-24 7:56 ` Paolo Bonzini
2012-08-24 7:56 ` [Qemu-devel] " Paolo Bonzini
2012-08-24 10:43 ` Hannes Reinecke
2012-08-24 10:43 ` [Qemu-devel] " Hannes Reinecke
2012-08-24 9:05 ` Stefan Hajnoczi
2012-08-24 9:05 ` [Qemu-devel] " Stefan Hajnoczi
2012-08-24 9:14 ` Paolo Bonzini
2012-08-24 9:14 ` [Qemu-devel] " Paolo Bonzini
2012-08-24 0:45 ` Nicholas A. Bellinger
2012-08-21 9:49 ` Stefan Hajnoczi
2012-08-21 9:49 ` [Qemu-devel] " Stefan Hajnoczi
2012-08-21 18:31 ` Blue Swirl
2012-08-21 18:31 ` Blue Swirl
2012-08-22 8:25 ` Stefan Hajnoczi
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