On 09/10/2010 03:44 PM, Michael Tokarev wrote:
10.09.2010 16:19, Avi Kivity wrote:
On 09/03/2010 03:21 PM, Michael Tokarev wrote:
Hello.
I noticed that window7, unlike windowsXP as I played with
previously, poses quite high load on host when idle. On
my machine, host cpu usage is about 25% when one single-cpu
win7 guest is running with "-usbdevice tablet" option.
Here's a typical kvm_stats when such a guest is idling:
[]
That's pretty good for an idle guest.
Hm. Well. Sometimes it goes "a bit" further than that:
efer_reload 0 0
exits 6307547 12445
This still isn't worth 25% cpu.
What does the guest think it is doing? The Windows performance monitor?
Nothing. It shows perfmon.exe using 3% CPU, and that's about
it. I'm attaching a .png screenshot of the KVM window with
w7 perfmon running. Unfortunately I don't have English
version handy, it's all in Russian, and I weren't able to
change system language to English. But it is still readable.
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.
Also, I haven't found a way to see, for example, individual
interrupt activity in windows (like /proc/interrupts in
linux).
irq_injections is very low anyway.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
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