Re: [ANNOUNCE] 4.4-rc6-rt1

From	Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Newsgroups	linux.kernel
Subject	Re: [ANNOUNCE] 4.4-rc6-rt1
Date	2016-01-13 19:00 +0100
Message-ID	<qQxSb-37P-23@gated-at.bofh.it> (permalink)
References	<qJ0xY-74S-5@gated-at.bofh.it> <qLOgV-6Ka-9@gated-at.bofh.it> <qM2ae-76b-7@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

* 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

Back to linux.kernel | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

Re: [ANNOUNCE] 4.4-rc6-rt1 Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-01-13 19:00 +0100
  Re: [ANNOUNCE] 4.4-rc6-rt1 Grygorii Strashko <grygorii.strashko@ti.com> - 2016-01-13 19:40 +0100
    Re: [ANNOUNCE] 4.4-rc6-rt1 Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-01-14 16:00 +0100
  Re: [ANNOUNCE] 4.4-rc6-rt1 Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-01-14 10:40 +0100
  Re: [ANNOUNCE] 4.4-rc6-rt1 Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-01-14 15:20 +0100
    Re: [ANNOUNCE] 4.4-rc6-rt1 Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-01-14 15:40 +0100
      Re: [ANNOUNCE] 4.4-rc6-rt1 Thomas Gleixner <tglx@linutronix.de> - 2016-01-14 15:40 +0100
        Re: [ANNOUNCE] 4.4-rc6-rt1 Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-01-14 16:00 +0100
          Re: [ANNOUNCE] 4.4-rc6-rt1 Thomas Gleixner <tglx@linutronix.de> - 2016-01-14 16:10 +0100
            Re: [ANNOUNCE] 4.4-rc6-rt1 Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-01-14 17:10 +0100

csiph-web