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Message-ID: <18304.47573.556627.975776@cargo.ozlabs.ibm.com>
Date: Sun, 6 Jan 2008 22:21:57 +1100
From: Paul Mackerras <paulus@samba.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: benh@kernel.crashing.org, "Robin H. Johnson" <robbat2@gentoo.org>,
       linux-kernel@vger.kernel.org
Subject: Re: Idle loadavg of ~1, maybe MD related
In-Reply-To: <20080105190506.38dcf45e.akpm@linux-foundation.org>
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	<20080105013037.a354b33a.akpm@linux-foundation.org>
	<20080105100455.GB911@curie-int.orbis-terrarum.net>
	<1199528332.7291.53.camel@pasglop>
	<20080105190506.38dcf45e.akpm@linux-foundation.org>
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Andrew Morton writes:

> Maybe, but we can usually work around it pretty comfortably.
> 
> If smu_set_fan() is only ever called by a kernel thread then we can simply
> flip it over to using wait_for_completion_interruptible().
> 
> If smu_set_fan() is also called from user processes then things aren't so
> easy...

I believe most of the time spent waiting is actually spent inside the
i2c layer in uninterruptible sleeps.

Robin, what does the "motherboard" line in /proc/cpuinfo say on your
machine?

Paul.
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