Re: kvm very slow

[Ulrich Schreiner <ulrich.schreiner-sZDnKEZIvs8b1SvskN2V4Q@public.gmane.org>]

no ideas what can be done? why it is so slow?

i've tried the "-L /usr/shar/kvm" to use the kvm-bios but no better
performance ...

Am Donnerstag, den 02.08.2007, 11:24 +0300 schrieb Avi Kivity:
> Ulrich Schreiner wrote:
> > dmesg|grep kvm
> >
> > SELinux: initialized (dev kvmfs, type kvmfs), uses genfs_contexts
> > kvm: emulating exchange as write
> >
> >   
> 
> There may be messages that aren't prefixed with 'kvm:' (that's a bug 
> btw).  Please check.
> 
> > now booting into a F7 image, after the system is ready (and in idle):
> >
> > top
> >    PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
> > 14917 root      20   0  332m  71m  66m S    6  0.9   1:17.05 qemu-kvm
> > 14954 root      20   0 14552 1072  812 R    0  0.0   0:00.01 top
> >      1 root      20   0 10320  680  572 S    0  0.0   0:02.02 init
> >
> > kvm_stat (snapshot):
> >
> > kvm statistics
> >
> >   exits        12254399   79079
> >   halt_exits     326543    4632
> >   invlpg              0       0
> >   io_exits      6539798   74320
> >   irq_exits       43523      29
> >   irq_window       4984       0
> >   mmio_exits    1319016       0
> >   pf_fixed      3140955      56
> >   pf_guest       448187       6
> >   request_irq         0       0
> >   signal_exit     39728       0
> >   tlb_flush       29511      31
> >   
> 
> Wow -- lots of I/O exits.  What does 'top' in the guest say? 'hdparm 
> /dev/hda' in the guest?
> 
> > when logging into the virtual machine (via ssh) the virtual world is 
> > very slow: i set the time with "ntpdate" and wait exact one minute in 
> > reality. in the virtual image only 24sec are gone!
> >
> > and everything else in the image is really slow.
> >
> >   
> 


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