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Re: [Qemu-devel] [question] the patch which affect performance of virtio
From: |
Wangting (Kathy) |
Subject: |
Re: [Qemu-devel] [question] the patch which affect performance of virtio-scsi |
Date: |
Tue, 3 Feb 2015 10:56:43 +0800 |
User-agent: |
Mozilla/5.0 (Windows NT 6.1; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 |
Sorry, I find that the patch of "virtio-scsi: Optimize virtio_scsi_init_req"
can slove this problem.
By the way, can you tell me the reason of the change about cdb and sense?
On 2015-2-3 10:31, Wangting (Kathy) wrote:
> Hi Paolo,
>
> Recently I test IO performance with virtio-scsi, and find out that the patch
> of
> "virtio-scsi: add support for the any_layout feature" affects IO performance
> of model
> with 4KB 32iodepth sequence read.
>
> Why cdb and sense is removed from the struct of VirtIOSCSICmdReq and
> VirtIOSCSICmdResp?
> How do you consider the impact of the changes to the performance?
> Although the latest version of qemu can optimize the performance by the way
> of reading merger,
> I think the affect of this patch cannot be ignored.
>
> Best wishes,
>
> Ting
>
Re: [Qemu-devel] [question] the patch which affect performance of virtio-scsi, Paolo Bonzini, 2015/02/03