On Fri, Feb 10, 2012 at 2:36 PM, Dongsu Park <dongsu.park@xxxxxxxxxxxxxxxx> wrote: > Now I'm running benchmarks with both qemu-kvm 0.14.1 and 1.0. > > - Sequential read (Running inside guest) > # fio -name iops -rw=read -size=1G -iodepth 1 \ > -filename /dev/vdb -ioengine libaio -direct=1 -bs=4096 > > - Sequential write (Running inside guest) > # fio -name iops -rw=write -size=1G -iodepth 1 \ > -filename /dev/vdb -ioengine libaio -direct=1 -bs=4096 > > For each one, I tested 3 times to get the average. > > Result: > > seqread with qemu-kvm 0.14.1 67,0 MByte/s > seqread with qemu-kvm 1.0 30,9 MByte/s > > seqwrite with qemu-kvm 0.14.1 65,8 MByte/s > seqwrite with qemu-kvm 1.0 30,5 MByte/s Please retry with the following commit or simply qemu-kvm.git/master. Avi discovered a performance regression which was introduced when the block layer was converted to use coroutines: $ git describe 39a7a362e16bb27e98738d63f24d1ab5811e26a8 v1.0-327-g39a7a36 (This commit is not in 1.0!) Please post your qemu-kvm command-line. 67 MB/s sequential 4 KB read means 67 * 1024 / 4 = 17152 requests per second, so 58 microseconds per request. Please post the fio output so we can double-check what is reported. Stefan -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
