Re: [PATCH] softirq: let ksoftirqd do its job

From: Peter Zijlstra
Date: Thu Sep 01 2016 - 07:54:04 EST


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?