Re: kvm very slow

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

/sbin/hdparm /dev/sda

/dev/sda:
  IO_support   =  0 (default 16-bit)
  readonly     =  0 (off)
  readahead    = 256 (on)
  geometry     = 3263/255/63, sectors = 52428800, start = 0

top in the guest-vm shows nothing special

top - 10:27:37 up 13:09,  2 users,  load average: 0.05, 0.07, 0.02
Tasks:  74 total,   2 running,  72 sleeping,   0 stopped,   0 zombie
Cpu(s):  0.0%us,  0.0%sy,  0.0%ni, 99.7%id,  0.3%wa,  0.0%hi,  0.0%si, 
0.0%st
Mem:    255396k total,   161060k used,    94336k free,     8728k buffers
Swap:  1048568k total,        4k used,  1048564k free,    42716k cached

   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
  4592 root      15   0  2204  976  792 R  0.3  0.4   0:00.04 top
     1 root      18   0  2140  636  548 S  0.0  0.2   0:01.44 init
     2 root      RT   0     0    0    0 S  0.0  0.0   0:00.00 migration/0
     3 root      34  19     0    0    0 S  0.0  0.0   0:00.00 ksoftirqd/0

dmesg in the host: well i cannot find any entries of interest. here is a 
link to the dmesg:

http://usc.innuendo.de/kvm/dmesg.txt

Avi Kivity schrieb:
> 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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