linux-kernel - Re: [ANNOUNCE] 4.4-rc6-rt1

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Date:	Thu, 14 Jan 2016 10:33:18 +0100
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	Clark Williams <williams@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [ANNOUNCE] 4.4-rc6-rt1

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