From: Cong Meng <mc@linux.vnet.ibm.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>,
Stefan Hajnoczi <stefanha@gmail.com>,
zwanp@cn.ibm.com, linuxram@us.ibm.com, qemu-devel@nongnu.org,
virtualization@lists.linux-foundation.org
Subject: Re: [Qemu-devel] [PATCH 1/2 v1] blkdrv: Add queue limits parameters for sg block drive
Date: Thu, 23 Aug 2012 17:31:31 +0800 [thread overview]
Message-ID: <5035F873.6090305@linux.vnet.ibm.com> (raw)
In-Reply-To: <5034E918.4030305@redhat.com>
On Wed 22 Aug 2012 10:13:44 PM CST, Paolo Bonzini wrote:
> 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. :/
>
So, as the problem exist to CD-ROM, I will continue to get these
patches move on.
As Paolo pointed out, the only limit is max_sectors (the total size of
a scatter-list),
I will drop the other 2 parameters.
Paolo, what's your opinion?
Cong
> Paolo
>
next prev parent reply other threads:[~2012-08-23 9:31 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-21 8:23 [Qemu-devel] [PATCH 1/2 v1] blkdrv: Add queue limits parameters for sg block drive Cong Meng
2012-08-21 8:23 ` [Qemu-devel] [PATCH 2/2 v1] virtio-scsi: set per-LUN queue limits for sg devices Cong Meng
2012-08-21 9:56 ` Stefan Hajnoczi
2012-08-21 8:48 ` [Qemu-devel] [PATCH 1/2 v1] blkdrv: Add queue limits parameters for sg block drive Paolo Bonzini
2012-08-21 9:41 ` Cong Meng
2012-08-21 9:52 ` Stefan Hajnoczi
2012-08-21 10:14 ` Paolo Bonzini
2012-08-22 11:04 ` Cong Meng
2012-08-22 12:09 ` Paolo Bonzini
2012-08-22 13:13 ` Stefan Hajnoczi
2012-08-22 14:13 ` Paolo Bonzini
2012-08-23 9:31 ` Cong Meng [this message]
2012-08-23 10:03 ` Paolo Bonzini
2012-08-23 10:08 ` Stefan Hajnoczi
2012-08-23 10:52 ` Paolo Bonzini
2012-08-23 12:08 ` Stefan Hajnoczi
2012-08-24 0:45 ` Nicholas A. Bellinger
2012-08-24 7:56 ` Paolo Bonzini
2012-08-24 10:43 ` Hannes Reinecke
2012-08-24 9:05 ` Stefan Hajnoczi
2012-08-24 9:14 ` Paolo Bonzini
2012-08-21 9:49 ` Stefan Hajnoczi
2012-08-21 18:31 ` Blue Swirl
2012-08-22 8:25 ` Stefan Hajnoczi
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