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. 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% > > ============ > > > > > > > > > > > -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
