linux-kernel - Re: Problem: Load average of 6, no I/O, 25% idle time. Why?

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Message-ID: <9871ee5f0807201639l229280abg1d6a25fcbeaa2b4d@mail.gmail.com>
Date:	Sun, 20 Jul 2008 19:39:24 -0400
From:	"Timothy Normand Miller" <theosib@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: Problem: Load average of 6, no I/O, 25% idle time. Why?

On Fri, Jul 18, 2008 at 8:49 AM, Timothy Normand Miller
<theosib@...il.com> wrote:
> I have a four processor box, running three compute loads.  The kernel
> I'm running is 2.6.25-gentoo-r5.
>
> One process has four threads, and it's niced to 19.
> Another process has one thread and is niced to -10
> The last process has one thread and is niced to 0
>
> One processor is always idle.
>
> If I change either the 0 to a -10 or the -10 to a zero, then all four
> cores are properly utilized.
>
> Does this make sense to anyone?  Besides messing with the nice levels,
> is there another way to fix this?

I updated to kernel 2.6.26-gentoo, and I no longer see any of the
problems I observed.  No idle time under any circumstances where the
system has plenty of work to do and no I/O waiting.

Thanks, everyone!

-- 
Timothy Normand Miller
http://www.cse.ohio-state.edu/~millerti
Open Graphics Project
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