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

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Message-ID: <20160113175845.GK29964@linutronix.de>
Date:	Wed, 13 Jan 2016 18:58:45 +0100
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Mike Galbraith <umgwanakikbuti@...il.com>
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

* 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.

Sebastian