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SubjectRe: [RFC] IO scheduler based IO controller V6
On Mon, Jul 27, 2009 at 08:55:03AM -0400, 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.
>

Gui, can you also try with CONFIG_TRACK_ASYNC_CONTEXT=n and see if it improves
buffered write performance.

Thanks
Vivek

> 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.
>
> 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%
> >
> > ============
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
>
>
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