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SubjectRe: [PATCH] softirq: let ksoftirqd do its job
On Thu, 1 Sep 2016 13:53:56 +0200
Peter Zijlstra <peterz@infradead.org> wrote:

> On Thu, Sep 01, 2016 at 01:02:31PM +0200, Jesper Dangaard Brouer wrote:
> > PID S %CPU TIME+ COMMAND
> > 3 R 50.0 29:02.23 ksoftirqd/0
> > 10881 R 10.7 1:01.61 udp_sink
> > 10837 R 10.0 1:05.20 udp_sink
> > 10852 S 10.0 1:01.78 udp_sink
> > 10862 R 10.0 1:05.19 udp_sink
> > 10844 S 9.7 1:01.91 udp_sink
> >
> > This is strange, why is ksoftirqd/0 getting 50% of the CPU time???
>
> Do you run your udp_sink thingy in a cpu-cgroup?

That was also Paolo's feedback (IRC). I'm not aware of it, but it
might be some distribution (Fedora 22) default thing.

How do I verify/check if I have enabled a cpu-cgroup?

--
Best regards,
Jesper Dangaard Brouer
MSc.CS, Principal Kernel Engineer at Red Hat
Author of http://www.iptv-analyzer.org
LinkedIn: http://www.linkedin.com/in/brouer

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