Re: Bad Performance

[Darren Blaber <dmbtech-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

Avi Kivity wrote:
> Darren Blaber wrote:
>>  Hello, I was wondering if any of you were able to to help me figure out
>> why I am getting poor performance with kvm.  When running windows as a
>> guest os, when windows is idle, using 1-2% cpu, the kvm process  uses
>> about 20-30% cpu. Whenever I am doing any kind of activity (especially
>> disk activity) its shoots right up to 99%.  Anyway, have a readprofile
>> snap shot as well as kvm stat output.
>>
>>   7383 hpet_rtc_timer_init                       35.4952
>>   2360 sys_timer_gettime                         18.4375
>>   
>
> This is suspiciously high.  Anything about hpet in dmesg?  Can you try
> a .config without hpet?
>
>
This is the information in dmes:
dmb@alpha:~$ dmesg|grep hpet
[    7.533397] hpet0: at MMIO 0xfed00000, IRQs 2, 8, 0
[    7.533401] hpet0: 3 64-bit timers, 14318180 Hz
[    0.752000] Time: hpet clocksource has been installed.
[    1.768000] hpet_resources: 0xfed00000 is busy

dmb@alpha:~$ dmesg|grep HPET
[    0.000000] ACPI: HPET 7FED4F00, 0038 (r1 DELL    M07            1
ASL        61)
[    0.000000] ACPI: HPET id: 0x8086a201 base: 0xfed00000
I will try a .config without hpet soon.

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