Vivek Goyal wrote:> 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. Hi Vivek, Ok, I'll do it, and i'll do the performance test for IO Controller V7, and post the results as soon as i get them. > > 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%>>>>>> ============>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> > > -- RegardsGui Jianfeng _______________________________________________Containers mailing listContainers@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx://lists.linux-foundation.org/mailman/listinfo/containers
