On Wed, Jun 15, 2011 at 9:23 PM, Sasha Levin <levinsasha928@xxxxxxxxx> wrote: > On Wed, 2011-06-15 at 21:13 +0100, Prasad Joshi wrote: >> On Wed, Jun 15, 2011 at 6:10 PM, Pekka Enberg <penberg@xxxxxxxxxx> wrote: >> > On Wed, Jun 15, 2011 at 7:30 PM, Avi Kivity <avi@xxxxxxxxxx> wrote: >> >> On 06/15/2011 06:53 PM, Pekka Enberg wrote: >> >>> >> >>> - Fast QCOW2 image read-write support beating Qemu in fio benchmarks. See >> >>> the >> >>> following URL for test result details: https://gist.github.com/1026888 >> >> >> >> This is surprising. How is qemu invoked? >> > >> > Prasad will have the details. Please note that the above are with Qemu >> > defaults which doesn't use virtio. The results with virtio are little >> > better but still in favor of tools/kvm. >> > >> >> The qcow2 image used for testing was copied on to /dev/shm to avoid >> the disk delays in performance measurement. >> >> QEMU was invoked with following parameters >> >> $ qemu-system-x86_64 -hda <disk image on hard disk> -hdb >> /dev/shm/test.qcow2 -m 1024M >> > > Prasad, Could you please run this test with '-drive > file=/dev/shm/test.qcow2,if=virtio' instead of the '-hdb' thing? > Infact I have already tried that. Like Pekka mentioned, the results are still in favour of KVM tools. I machine that I work on is not with me at the moment, I will be able to mail the exact numbers tomorrow. Thanks and Regards, Prasad >> FIO job file used for measuring the numbers was >> >> prasad@prasad-vm:~$ cat fio-mixed.job >> ; fio-mixed.job for autotest >> >> [global] >> name=fio-sync >> directory=/mnt >> rw=randrw >> rwmixread=67 >> rwmixwrite=33 >> bsrange=16K-256K >> direct=0 >> end_fsync=1 >> verify=crc32 >> ;ioscheduler=x >> numjobs=4 >> >> [file1] >> size=50M >> ioengine=sync >> mem=malloc >> >> [file2] >> stonewall >> size=50M >> ioengine=aio >> mem=shm >> iodepth=4 >> >> [file3] >> stonewall >> size=50M >> ioengine=mmap >> mem=mmap >> direct=1 >> >> [file4] >> stonewall >> size=50M >> ioengine=splice >> mem=malloc >> direct=1 >> >> - The test generates 16 file each of ~50MB, so in total ~800MB data was written. >> - The test.qcow2 was newly created before it was used with QEMU or KVM tool >> - The size of the QCOW2 image was 1.5GB. >> - The host machine had 2GB RAM. >> - The guest machine in both the cases was started with 1GB memory. >> >> Thanks and Regards, >> Prasad >> >> >> btw the dump above is a little hard to interpret. >> > >> > It's what fio reports. The relevant bits are: >> > >> > >> > Qemu: >> > >> > Run status group 0 (all jobs): >> > READ: io=204800KB, aggrb=61152KB/s, minb=15655KB/s, maxb=17845KB/s, >> > mint=2938msec, maxt=3349msec >> > WRITE: io=68544KB, aggrb=28045KB/s, minb=6831KB/s, maxb=7858KB/s, >> > mint=2292msec, maxt=2444msec >> > >> > Run status group 1 (all jobs): >> > READ: io=204800KB, aggrb=61779KB/s, minb=15815KB/s, maxb=17189KB/s, >> > mint=3050msec, maxt=3315msec >> > WRITE: io=66576KB, aggrb=24165KB/s, minb=6205KB/s, maxb=7166KB/s, >> > mint=2485msec, maxt=2755msec >> > >> > Run status group 2 (all jobs): >> > READ: io=204800KB, aggrb=6722KB/s, minb=1720KB/s, maxb=1737KB/s, >> > mint=30178msec, maxt=30467msec >> > WRITE: io=65424KB, aggrb=2156KB/s, minb=550KB/s, maxb=573KB/s, >> > mint=29682msec, maxt=30342msec >> > >> > Run status group 3 (all jobs): >> > READ: io=204800KB, aggrb=6994KB/s, minb=1790KB/s, maxb=1834KB/s, >> > mint=28574msec, maxt=29279msec >> > WRITE: io=68192KB, aggrb=2382KB/s, minb=548KB/s, maxb=740KB/s, >> > mint=27121msec, maxt=28625msec >> > >> > Disk stats (read/write): >> > sdb: ios=60583/6652, merge=0/164, ticks=156340/672030, >> > in_queue=828230, util=82.71% >> > >> > tools/kvm: >> > >> > Run status group 0 (all jobs): >> > READ: io=204800KB, aggrb=149162KB/s, minb=38185KB/s, >> > maxb=46030KB/s, mint=1139msec, maxt=1373msec >> > WRITE: io=70528KB, aggrb=79156KB/s, minb=18903KB/s, maxb=23726KB/s, >> > mint=804msec, maxt=891msec >> > >> > Run status group 1 (all jobs): >> > READ: io=204800KB, aggrb=188235KB/s, minb=48188KB/s, >> > maxb=57932KB/s, mint=905msec, maxt=1088msec >> > WRITE: io=64464KB, aggrb=84821KB/s, minb=21751KB/s, maxb=27392KB/s, >> > mint=570msec, maxt=760msec >> > >> > Run status group 2 (all jobs): >> > READ: io=204800KB, aggrb=20005KB/s, minb=5121KB/s, maxb=5333KB/s, >> > mint=9830msec, maxt=10237msec >> > WRITE: io=66624KB, aggrb=6615KB/s, minb=1671KB/s, maxb=1781KB/s, >> > mint=9558msec, maxt=10071msec >> > >> > Run status group 3 (all jobs): >> > READ: io=204800KB, aggrb=66149KB/s, minb=16934KB/s, maxb=17936KB/s, >> > mint=2923msec, maxt=3096msec >> > WRITE: io=69600KB, aggrb=26717KB/s, minb=6595KB/s, maxb=7342KB/s, >> > mint=2530msec, maxt=2605msec >> > >> > Disk stats (read/write): >> > vdb: ios=61002/6654, merge=0/183, ticks=27270/205780, >> > in_queue=232220, util=69.46% >> > > > -- > > Sasha. > > -- 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
