dummynet: waking up pipe
Luigi Rizzo
rizzo at iet.unipi.it
Fri Jan 22 13:38:06 UTC 2010
On Fri, Jan 22, 2010 at 04:35:35PM +0300, Evgenii Davidov wrote:
...
> > > > my problem is that dummynet cpu usage jumps from 0 to 99%:
> > > >
> > > > 33 root 1 -68 - 0K 8K - 1 512.6H 86.18% dummynet
> > > > 33 root 1 -68 - 0K 8K - 1 512.6H 85.89% dummynet
> > > > 33 root 1 -68 - 0K 8K - 1 512.6H 88.28% dummynet
> > > > 33 root 1 -68 - 0K 8K - 0 512.6H 78.17% dummynet
> > > > 33 root 1 -68 - 0K 8K - 0 512.6H 0.88% dummynet
> > > > 33 root 1 -68 - 0K 8K - 1 512.6H 0.10% dummynet
> > > > 33 root 1 -68 - 0K 8K - 1 512.7H 0.00% dummynet
> > > > 33 root 1 -68 - 0K 8K - 1 512.7H 0.10% dummynet
> >
> > i am not too clear on why this happens -- there shuold be only
> > one instance of the dummynet thread, not 8 as in your case.
>
> no-no, one instance, it's a grep of a top log
ok then it's rather normal -- the task wakes up every millisecond and
it might have hundreds of packets to send at once, especially when
the machine is heavily loaded as in your case.
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