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Re: [Qemu-devel] [question] the patch which affect performance of virtio
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [question] the patch which affect performance of virtio-scsi |
Date: |
Sun, 08 Feb 2015 11:10:24 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0 |
On 07/02/2015 12:26, Wangting (Kathy) wrote:
> OK, Thank you very much for your detailed explanation.
>
> But I have another question about the big change from qemu-1.5.3 to
> qemu-1.6.0-rc0.
>
> When I use ramdisk for IO performance testing, the result is as follows.
>
> [fio-test] rw bs iodepth jobs bw
> iops
> ------------------------------------------------------------------------------------
> qemu-1.5.3 read 4k 32 1 285MB/s
> 73208
> qemu-1.6.0-rc0 read 4k 32 1 253MB/s
> 64967
>
> And virtio-blk is the same.
>
> I know there are so many differences between qemu-1.5 and qemu-1.6, but I am
> confused about
> what new features impact the performance so much. Do you know it?
No, sorry. Please try newer versions first and see if this was fixed.
QEMU 1.6 is more than a year old.
Paolo
Re: [Qemu-devel] [question] the patch which affect performance of virtio-scsi, Paolo Bonzini, 2015/02/03