Re: high load with win7 & usb tablet

[Avi Kivity <avi@redhat.com>]

  On 09/10/2010 05:47 PM, Michael Tokarev wrote:
> 10.09.2010 16:50, Avi Kivity wrote:
> []
>>> During this shot, host CPU was about 30..35% in use - higher
>>> than usual 25%, but I guess it's due to perfmon.
>> Please build qemu with --disable-strip and use 'perf' to profile it.
> Done, I tried several different options, but I can't find
> anything intesting in there.  Attaching a screenshot of
> 3 - win7 guest (~5 minutes after startup), `perf top'
> in xterm and `top' in another xterm.
>
> Here are random snapshots of both, in text form:
>
> ---------------------------------------------------------------------------------------
>     PerfTop:    1409 irqs/sec  kernel:79.6%  exact:  0.0% [1000Hz cycles],  (all, 2 CPUs)
> ---------------------------------------------------------------------------------------
>
>               samples  pcnt function                        DSO
>               _______ _____ _______________________________ _______________________
>
>              11837.00 64.9% native_safe_halt                [kernel.kallsyms]
>                570.00  3.1% rb_next                         [kernel.kallsyms]
>                206.00  1.1% hpet_next_event                 [kernel.kallsyms]
>                149.00  0.8% do_select                       [kernel.kallsyms]
>                149.00  0.8% svm_vcpu_run                    [kvm_amd]
>                134.00  0.7% schedule                        [kernel.kallsyms]
>
>
> Tasks: 199 total,   2 running, 196 sleeping,   0 stopped,   1 zombie
> Cpu(s): 13.4%us, 10.2%sy,  0.0%ni, 76.3%id,  0.0%wa,  0.0%hi,  0.2%si,  0.0%st
> Mem:   5860724k total,  4601132k used,  1259592k free,    18508k buffers
> Swap:  4192928k total,   286928k used,  3906000k free,  1593908k cached
>
>    PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
> 28492 mjt       20   0 1111m 1.0g 5456 R   27 17.7   3:50.79 qemu-system-x86
> 28763 root      20   0  105m  30m 6176 S   11  0.5 184:08.58 Xorg
> 29263 mjt       20   0  637m 212m  11m S    6  3.7  92:08.82 firefox-bin
> 28845 mjt       20   0 58612 5840 2372 S    2  0.1  49:27.17 compiz
>
> I'm still not sure where to look at.. :)
>

Strange.  Can you also post a few lines of 'vmstat 1'?

Maybe we'll see a lot of context switches in there.

-- 
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