linux-kernel - Re: [PATCH] softirq: let ksoftirqd do its job

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Message-ID: <20160901115356.GT10153@twins.programming.kicks-ass.net>
Date:   Thu, 1 Sep 2016 13:53:56 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     Eric Dumazet <eric.dumazet@...il.com>,
        David Miller <davem@...emloft.net>,
        Rik van Riel <riel@...hat.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Hannes Frederic Sowa <hannes@...hat.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>, Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH] softirq: let ksoftirqd do its job

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?