linux-kernel - Re: Idle loadavg of ~1, maybe MD related

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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@...ba.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	benh@...nel.crashing.org, "Robin H. Johnson" <robbat2@...too.org>,
	linux-kernel@...r.kernel.org
Subject: Re: Idle loadavg of ~1, maybe MD related

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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