Re: Guest OS lock up with 100% cpu usage when using tap

[Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

Daniel Paquet wrote:
> Just tried -no-kvmirqchip and it's a no go, and after it I tryed 
> without taskset and -no-kvmirqchip and it worked... Anyway I will 
> allways use taskset until now.
>

Sorry, hard to piece all the info from the scattered reports.  Please 
report, for each of:

- regular
- -no-kvm-irqchip
- taskset

Whether you get

- reliable failure
- sometimes works, sometimes doesn't
- always works

so I can try to find a pattern.

Also, is tap required to reproduce the problem, or do you occasionally 
get it with -net user?


> On 9/19/07, * Avi Kivity* <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org <mailto:avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>> 
> wrote:
>
>     Daniel Paquet wrote:
>     > Well well, that did it!!!
>     >
>     > For now I even restarted my host machine and the guest os boots
>     > flawlessly now with taskset! Oh well, I now know a new nice
>     linux app
>     > taskset :)
>     >
>     > I saw similar problems with some games under windows, that you
>     had to
>     > set the affinity to a specific core, if not you were getting those
>     > kind of small hang, like I was having with kvm and my guest
>     machines.
>     >
>     > And you guessed right I have a dual core cpu.
>     >
>     > Anyone have an idea why this is only happening when using a tap
>     > network interface? I am curious...
>
>     No idea.
>
>     Can you try one more thing?  -no-kvm-irqchip, but no taskset.  I'm
>     trying to find out if the smp issue is with the apic code or
>     elsewhere.
>
>     --
>     error compiling committee.c: too many arguments to function
>
>
>
>
> -- 
> Ubuntu est un ancien mot africain qui veut dire "Je ne peux pas 
> configurer Debian"
> --
> Daniel Paquet 


-- 
Any sufficiently difficult bug is indistinguishable from a feature.


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