Re: [Qemu-devel] [Bug 950692] Re: High CPU usage in Host (revisited)

[Mulyadi Santosa]

On Sun, Mar 11, 2012 at 05:30, PetaMem <address@hidden> wrote:
> *Newsflash*
>
> We do have a "well-behaving" KVM Host with 3.2.9 kernel on machine C

Note: I am not Qemu developer :)

OK, I read your bug report many times. I think you need deeper
profiling here. Perhaps "perf top" is the best bet. Just make sure the
kernel has debug symbols included so "perf" has as little difficulties
as possible to interpret addresses into symbol names.

Once you found the culprit, it could be easier to fix it.

NB: -smp triggered it? hmmmmm bad locking somewhere perhaps? Anyway, i
am not sure Qemu/KVM could really flawlessly implement SMP. So maybe
it points to hidden bug in the vCPU parallel execution code somewhere.


-- 
regards,

Mulyadi Santosa
Freelance Linux trainer and consultant

blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com