linux-kernel - Re: high system cpu load during intense disk i/o

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Message-Id: <20070805182811.a8992126.akpm@linux-foundation.org>
Date:	Sun, 5 Aug 2007 18:28:11 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Dimitrios Apostolou <jimis@....net>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: high system cpu load during intense disk i/o

On Sun, 5 Aug 2007 19:03:12 +0300 Dimitrios Apostolou <jimis@....net> wrote:

> was my report so complicated?

We're bad.

Seems that your context switch rate when running two instances of
badblocks against two different disks went batshit insane.  It doesn't
happen here.

Please capture the `vmstat 1' output while running the problematic
workload.

The oom-killing could have been unrelated to the CPU load problem.  iirc
badblocks uses a lot of memory, so it might have been genuine.  Keep an eye
on the /proc/meminfo output and send the kernel dmesg output from the
oom-killing event.
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