From: Mike Galbraith <umgwanakikbuti@gmail.com>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Clark Williams <williams@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
LKML <linux-kernel@vger.kernel.org>,
linux-rt-users <linux-rt-users@vger.kernel.org>,
Steven Rostedt <rostedt@goodmis.org>
Subject: Re: [ANNOUNCE] 4.4-rc6-rt1
Date: Thu, 14 Jan 2016 10:33:18 +0100 [thread overview]
Message-ID: <1452763998.3460.83.camel@gmail.com> (raw)
In-Reply-To: <20160113175845.GK29964@linutronix.de>
On Wed, 2016-01-13 at 18:58 +0100, Sebastian Andrzej Siewior wrote:
> * Mike Galbraith | 2016-01-01 08:19:41 [+0100]:
>
> > > PID USER PR NI VIRT RES SHR S %CPU %MEM
> > > TIME+ COMMAND
> > > 3 root -2 0 0 0 0 S 37.3 0.0
> > > 307:52.44 ksoftirqd/0
> > > 32 root -2 0 0 0 0 S 37.3 0.0
> > > 308:08.72 ksoftirqd/2
> > > 42 root -2 0 0 0 0 R 37.3 0.0
> > > 308:32.84 ksoftirqd/3
> > > 22 root -2 0 0 0 0 S 26.9 0.0
> > > 222:29.82 ksoftirqd/1
> > > 1 root 20 0 46628 6980 4976 S 1.3 0.2
> > > 0:13.98 systemd
> > > 22358 williams 20 0 159980 4552 3780 R 1.0 0.1
> > > 0:00.39 top
> >
> > Heh, I didn't notice immediately because I throttle nohz, am seeing
> > only tiny utilization (but nohz idle isn't working). With throttle
> > patch removed, box is screaming, expires=4294990471 pokes eyeball.
>
> This is due to NO_HZ as far as I can tell. My AMD A10 in idle mode
> has
> 0.7% utilisation of ksoftirqd/ with CONFIG_HZ_PERIODIC and with
> CONFIG_NO_HZ_FULL it shows about 25% on all CPU threads.
Thomas said the hrtimer adjustments went a little out of round. I
started rummaging, but then the world woke up from the holidays, so I
didn't get _to_ square one, much lest past it. Hohum.
-Mike
next prev parent reply other threads:[~2016-01-14 9:33 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-23 22:57 [ANNOUNCE] 4.4-rc6-rt1 Sebastian Andrzej Siewior
2015-12-31 16:24 ` Clark Williams
2016-01-01 7:19 ` Mike Galbraith
2016-01-01 9:14 ` Thomas Gleixner
2016-01-01 9:45 ` Mike Galbraith
[not found] ` <568CF08F.3070001@caviumnetworks.com>
2016-01-13 11:45 ` [ANNOUNCE] 4.4-rc6-rt1 (arm64) Jaggi, Manish
2016-01-13 13:45 ` Sebastian Andrzej Siewior
2016-01-14 11:50 ` Jaggi, Manish
2016-01-13 17:58 ` [ANNOUNCE] 4.4-rc6-rt1 Sebastian Andrzej Siewior
2016-01-13 18:36 ` Grygorii Strashko
2016-01-14 14:59 ` Sebastian Andrzej Siewior
2016-01-14 9:33 ` Mike Galbraith [this message]
2016-01-14 14:17 ` Sebastian Andrzej Siewior
2016-01-14 14:29 ` Mike Galbraith
2016-01-14 14:30 ` Thomas Gleixner
2016-01-14 14:57 ` Mike Galbraith
2016-01-14 15:07 ` Thomas Gleixner
2016-01-14 16:05 ` Mike Galbraith
2016-01-16 13:23 ` Mike Galbraith
2016-01-16 13:43 ` Thomas Gleixner
2016-01-16 13:52 ` Mike Galbraith
2016-01-16 13:59 ` Thomas Gleixner
2016-01-16 14:09 ` Mike Galbraith
2016-01-07 12:15 ` Tim Sander
2016-01-13 13:40 ` Sebastian Andrzej Siewior
2016-01-22 15:35 ` Grygorii Strashko
2016-01-22 15:48 ` Sebastian Andrzej Siewior
2016-01-22 20:44 ` Sebastian Andrzej Siewior
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