linux-kernel - Re: remove cpu hotplug bustification in cpufreq.

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Message-ID: <20060725150606.GA8566@harddisk-recovery.com>
Date:	Tue, 25 Jul 2006 17:06:07 +0200
From:	Erik Mouw <erik@...ddisk-recovery.com>
To:	Linus Torvalds <torvalds@...l.org>
Cc:	Chuck Ebbert <76306.1226@...puserve.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Ashok Raj <ashok.raj@...el.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>, Andrew Morton <akpm@...l.org>
Subject: Re: remove cpu hotplug bustification in cpufreq.

On Mon, Jul 24, 2006 at 05:59:23PM -0700, Linus Torvalds wrote:
> On Mon, 24 Jul 2006, Chuck Ebbert wrote:
> > 
> > I thought just the 'ondemand' governor was a problem?
> 
> The ondemand governor seems to be singled out not because it has unique 
> problems, but because it seems to be used by Fedora Core for some strange 
> reason.
> 
> I would judge that any bugs in cpufreq_ondemand.c are likely equally 
> evident in cpufreq_conservative.c, for example. I think the two have the 
> same background, and seem to have the same broken locking.

The "conservative" governor switches less often, so the locking
condition just happens less often.

After some strange lockups with 2.6.18-rc* I switched from "ondemand"
to "conservative" and now my laptop survives the night. Sheer luck, I
guess. I'd rather switch to "powersave" or "performance".


Erik

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| Lab address: Delftechpark 26, 2628 XH, Delft, The Netherlands
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