[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2

From: Anthony Liguori
Subject: Re: [Qemu-devel] Anyone seeing huge slowdown launching qemu with Linux 2.6.35?
Date: Wed, 04 Aug 2010 11:46:34 -0500
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20100713 Lightning/1.0b1 Thunderbird/3.0.6

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. It also supports SCSI level pass through which is pretty nice for enabling things like NPIV.


Anthony Liguori

reply via email to

[Prev in Thread] Current Thread [Next in Thread]