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 improvesbuffered write performance. ThanksVivek > 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%> > > > ============> > > > > > > > > > > > > > > > > > > > > > > > > _______________________________________________Containers mailing listContainers@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx://lists.linux-foundation.org/mailman/listinfo/containers
