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Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2
From: |
Alexander Graf |
Subject: |
Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35? |
Date: |
Wed, 4 Aug 2010 18:51:33 +0200 |
On 04.08.2010, at 18:49, Anthony Liguori wrote:
> On 08/04/2010 11:48 AM, Alexander Graf wrote:
>> On 04.08.2010, at 18:46, Anthony Liguori wrote:
>>
>>
>>> On 08/04/2010 11:44 AM, Avi Kivity wrote:
>>>
>>>> On 08/04/2010 03:53 PM, Anthony Liguori wrote:
>>>>
>>>>> So how do we enable support for more than 20 disks? I think a
>>>>> virtio-scsi is inevitable..
>>>>>
>>>> Not only for large numbers of disks, also for JBOD performance. If you
>>>> have one queue per disk you'll have low queue depths and high interrupt
>>>> rates. Aggregating many spindles into a single queue is important for
>>>> reducing overhead.
>>>>
>>> Right, the only question is, to you inject your own bus or do you just
>>> reuse SCSI. On the surface, it seems like reusing SCSI has a significant
>>> number of advantages. For instance, without changing the guest's drivers,
>>> we can implement PV cdroms or PC tape drivers.
>>>
>> What exactly would keep us from doing that with virtio-blk? I thought that
>> supports scsi commands already.
>>
>
> I think the toughest change would be making it appear as a scsi device within
> the guest. You could do that to virtio-blk but it would be a flag day as
> reasonable configured guests will break.
>
> Having virtio-blk device show up as /dev/vdX was a big mistake. It's been
> nothing but a giant PITA. There is an amazing amount of software that only
> looks at /dev/sd* and /dev/hd*.
I completely agree and yes, we should move in that direction IMHO. I don't see
why virtio-blk should be any different from megasas for example.
Alex
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, (continued)
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Anthony Liguori, 2010/08/03
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Paolo Bonzini, 2010/08/03
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Anthony Liguori, 2010/08/03
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Paolo Bonzini, 2010/08/04
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Avi Kivity, 2010/08/04
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Anthony Liguori, 2010/08/04
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Avi Kivity, 2010/08/04
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Anthony Liguori, 2010/08/04
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Alexander Graf, 2010/08/04
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Anthony Liguori, 2010/08/04
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?,
Alexander Graf <=
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Paolo Bonzini, 2010/08/04
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Avi Kivity, 2010/08/04
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Alexander Graf, 2010/08/04
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Anthony Liguori, 2010/08/04
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Avi Kivity, 2010/08/04
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Anthony Liguori, 2010/08/04
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Alexander Graf, 2010/08/04
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Avi Kivity, 2010/08/04
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Jamie Lokier, 2010/08/03
- Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?, Avi Kivity, 2010/08/04