Re: [ANNOUNCE] Native Linux KVM tool v2

[Sasha Levin <levinsasha928@gmail.com>]

On Wed, 2011-06-15 at 21:13 +0100, Prasad Joshi wrote:
> On Wed, Jun 15, 2011 at 6:10 PM, Pekka Enberg <penberg@kernel.org> wrote:
> > On Wed, Jun 15, 2011 at 7:30 PM, Avi Kivity <avi@redhat.com> 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?

> 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.