linux-kernel - Re: processors core stuck in full throttle after waking up from s2ram

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Message-ID: <20081123172426.GA7447@ucw.cz>
Date:	Sun, 23 Nov 2008 18:24:26 +0100
From:	Pavel Machek <pavel@...e.cz>
To:	"Justin P. Mattock" <justinmattock@...il.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: processors core stuck in full throttle after waking up from
	s2ram

Hi!


> > > the processor is full throttle on one of the cores.
> > 
> > Surely not.  The first core shows 2.16 GHz.
> > 
> > Anyway, it certainly is not related to the s2ram program in any way.
> 
> 
> Normally I would see cpu MHz: 1000 under both entries,
> this time upon wakeup theres 1000 and 2167.00. the 2167.00 doesn't move
> down to 1000 i.g. example of system normally:
>  cat /proc/cpuinfo <below>


> will move between 2167.00 to 1000 simultaneously under load with both
> cores, but then back down to 1000, for both when settled down.
> in this situation as I reported, the 2167.00 just
> stays at that number for one of the cores(if thats what I'm seeing) when
> waking up from suspend for some reason or another. 

Can you check with top that no process is running/eating time?

If you change cpufreq governor to powersave, will it react?

Can you check with powertop if the cpu is idle (C2/C3)or if it is
running something?

Actually, booting with nosmp might be useful. Is it always same core?
-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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