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