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SubjectRe: [RFC] IO scheduler based IO controller V6
Vivek Goyal wrote:
> On Mon, Jul 27, 2009 at 10:10:34AM +0800, Gui Jianfeng wrote:
>> Hi,
>>
>> Here are some fio test results for IO Controller V6 built and not built.
>> Iozone test results are also attached.
>>
>
> Hi Gui,
>
> Thanks a lot for some performance numbers. It seems to be a mixed chart.
> Performance gains at some places and loss at others. I am curious about
> that -7.0% for normal writes. Not sure what can contribute to that.
>
> What was the value of "fairness" parameter when you ran those tests? Can you
> please set fairness = 0 and re-run the tests (if you have already not done so).
>
> By default fairness is set to 1 in V6. With fairness = 0, we should be very
> close to existing CFQ behavior. If not, then we need to dive deeper and
> see why variations are happening.

Hi Vivek,

I re-run the fio test under V6 for normal reads and writes with fairness == 0.
It seems the performance gets a little better for normal writes than before.


Mode Normal read | Random read | Normal write | Random write
2.6.31-rc1 53,547KiB/s 2,894KiB/s 44,088KiB/s 8,450KiB/s

V6(fairness = 0) 53,199KiB/s 2,847KiB/s 41,898KiB/s 8,582KiB/s

Performance 0% -1.6% -4.9% +1.5%

>
> Is it also possible to run the same tests with V7.
>
> Thanks
> Vivek
>
>> Arch: X86
>> Mem: 1G
>> Disk: 320G
>> IO Scheduler: CFQ
>>
>> ============
>> By normal read and write syscall.
>>
>> Block Size:32K
>> File Size: 1G * 10
>>
>> Mode Normal read | Random read | Normal write | Random write | Direct read | Direct write
>>
>> 2.6.31-rc1 47,932KiB/s 3,566KiB/s 45,693KiB/s 8,501KiB/s 50,088KiB/s 43,473KiB/s
>>
>> 2.6.31-rc1-Vivek-V6 47,231KiB/s 3,411KiB/s 42,451KiB/s 8,714KiB/s 51,284KiB/s 42,341KiB/s
>>
>> Performance -1.5% -4.4% -7.0% +2.5% +2.4% -2.6%
>>
>> ============
>>
>> By mmap.
>>
>> Block Size:32K
>> File Size: 500M
>>
>> Mode Normal read | Random read | Normal write | Random write
>>
>> 2.6.31-rc1 49,951KiB/s 3,245KiB/s 21,950KiB/s 2,771KiB/s
>>
>> 2.6.31-rc1-Vivek-V6 49,951KiB/s 3,154KiB/s 22,593KiB/s 2,648KiB/s
>>
>> Performance 0% -2.8% +2.9% -4.4%
>>
>> ============
>>
>> By libaio calls
>>
>> Block Size:32K
>> File Size: 500M
>>
>> Mode Normal read | Random read | Normal write | Random write
>>
>> 2.6.31-rc1 49,447KiB/s 3,296KiB/s 57,519KiB/s 21,093KiB/s
>>
>> 2.6.31-rc1-Vivek-V6 50,142KiB/s 3,238KiB/s 57,791KiB/s 21,283KiB/s
>>
>> Performance +1.4% -1.8% 0% +0.1%
>>
>> ============
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
>
>
>
>

--
Regards
Gui Jianfeng


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