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Re: [Qemu-devel] poor virtio-scsi performance
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] poor virtio-scsi performance |
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Date: |
Mon, 08 Jun 2015 15:46:16 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0 |
On 08/06/2015 15:10, Andrey Korolyov wrote:
>
> You are probably hitting the (more or less fundamental) ceiling which
> was the reason for introducing dataplane backend recently, in other
> words, it does not matter how fast your backend is, the operation
> number will be limited by 50..100kIOPS without dataplane. As far as I
> remember the recent development made possible using it with
> virtio-scsi as well as with virtio-blk, so you`d possibly want to try
> it.
virtio-scsi dataplane is not yet 100% thread-safe, but in practice it
should work in 2.3+. It's definitely good enough for benchmarking.
Paolo