From: Jesper Dangaard Brouer <brouer@redhat.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Eric Dumazet <eric.dumazet@gmail.com>,
David Miller <davem@davemloft.net>,
Rik van Riel <riel@redhat.com>, Paolo Abeni <pabeni@redhat.com>,
Hannes Frederic Sowa <hannes@redhat.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
netdev <netdev@vger.kernel.org>, Jonathan Corbet <corbet@lwn.net>,
brouer@redhat.com
Subject: Re: [PATCH] softirq: let ksoftirqd do its job
Date: Fri, 2 Sep 2016 10:35:34 +0200 [thread overview]
Message-ID: <20160902103534.670b8f6a@redhat.com> (raw)
In-Reply-To: <20160901152802.GV10153@twins.programming.kicks-ass.net>
On Thu, 1 Sep 2016 17:28:02 +0200
Peter Zijlstra <peterz@infradead.org> wrote:
> On Thu, Sep 01, 2016 at 03:30:42PM +0200, Jesper Dangaard Brouer wrote:
> > Still... enabled!
> > Hmmm.. more idea how to disable this???
>
> I think you ought to be able to assign yourself to the root cgroup,
> something like:
>
> echo $$ > /cgroup/tasks
>
> or wheverever the cpu-cgroup controller is mounted at.
>
> But its been a fair while since I touched any of that, its not a CONFIG
> I have enabled much.
I could not figure out how to disable autogroups, so I ended up
compiling the kernel without CONFIG_SCHED_AUTOGROUP.
PID PR S %CPU TIME+ COMMAND
3 20 R 20.7 0:53.05 ksoftirqd/0
9299 20 R 16.3 0:03.62 udp_sink
9296 20 S 16.0 0:03.59 udp_sink
9297 20 R 16.0 0:03.58 udp_sink
9298 20 R 16.0 0:03.57 udp_sink
9295 20 R 15.3 0:03.43 udp_sink
Top new shows the CPU distribution is more correct, thus we can
concluded the artifact I saw was indeed caused by autogroup.
I can also confirm that my netperf UDP_STREAM tests now work again,
but I need around 32 parallel netperf to counter the effectiveness of
the ksoftirqd process. While I only need 5 udp_sink programs.
--
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
next prev parent reply other threads:[~2016-09-02 8:35 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <4f1c4b38528762619fff1fa963de8971006c1234.1472460085.git.pabeni@redhat.com>
[not found] ` <20160831100854.23dad2d8@redhat.com>
[not found] ` <1472650472.14381.317.camel@edumazet-glaptop3.roam.corp.google.com>
[not found] ` <1472650688.32433.115.camel@redhat.com>
[not found] ` <1472652643.14381.320.camel@edumazet-glaptop3.roam.corp.google.com>
[not found] ` <20160831164216.2901190c@redhat.com>
[not found] ` <1472661956.14381.335.camel@edumazet-glaptop3.roam.corp.google.com>
2016-08-31 17:42 ` [PATCH] softirq: let ksoftirqd do its job Eric Dumazet
2016-08-31 19:40 ` Jesper Dangaard Brouer
2016-08-31 20:42 ` Eric Dumazet
2016-08-31 21:51 ` Jesper Dangaard Brouer
2016-08-31 22:27 ` Eric Dumazet
2016-08-31 22:47 ` Rick Jones
2016-08-31 23:11 ` Eric Dumazet
2016-08-31 23:29 ` Rick Jones
2016-09-01 10:38 ` Jesper Dangaard Brouer
2016-09-01 13:06 ` Eric Dumazet
2016-09-01 11:02 ` Jesper Dangaard Brouer
2016-09-01 11:11 ` Hannes Frederic Sowa
2016-09-01 11:53 ` Peter Zijlstra
2016-09-01 12:29 ` Jesper Dangaard Brouer
2016-09-01 12:38 ` Jesper Dangaard Brouer
2016-09-01 12:48 ` Peter Zijlstra
2016-09-01 13:30 ` Jesper Dangaard Brouer
2016-09-01 15:28 ` Peter Zijlstra
2016-09-02 8:35 ` Jesper Dangaard Brouer [this message]
2016-09-01 12:57 ` Eric Dumazet
2016-09-01 13:00 ` Hannes Frederic Sowa
2016-09-01 13:25 ` Eric Dumazet
2016-09-01 12:05 ` Hannes Frederic Sowa
2016-09-01 12:51 ` Eric Dumazet
2016-09-01 12:01 ` Hannes Frederic Sowa
2016-09-02 6:39 ` David Miller
2016-09-23 11:35 ` Daniel Borkmann
2016-09-23 11:53 ` Peter Zijlstra
2016-09-23 16:51 ` Jesper Dangaard Brouer
2016-09-23 21:16 ` Peter Zijlstra
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