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Re: [Qemu-devel] virtio-blk and virtio-scsi performance comparison


From: Paolo Bonzini
Subject: Re: [Qemu-devel] virtio-blk and virtio-scsi performance comparison
Date: Thu, 16 Apr 2015 10:04:18 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0


On 16/04/2015 03:27, Fam Zheng wrote:
> 
> virtio-scsi, on the other hand, provides more features and means to be more
> scalable (you won't need to painfully mess with pci bridges to attach 1000
> disks).
> 
> Anyway, we are working on improving virtio-scsi performance, although it's
> theoretically impossible to make it faster or even equally fast.
> 
> Regarding your test, I think with current code base, it generally performs
> better if you use io=native. Have you compared that?

Also, make sure you're using the deadline scheduler in both host and guest.

Paolo



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