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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: |
Mon, 9 Feb 2015 10:53:31 +0800 |
User-agent: |
Mozilla/5.0 (Windows NT 6.1; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 |
On 2015-2-8 18:10, Paolo Bonzini wrote:
>
>
> 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
>
>
OK, thanks.
Ting
Re: [Qemu-devel] [question] the patch which affect performance of virtio-scsi, Paolo Bonzini, 2015/02/03