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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

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