linux-kernel - Re: extreme system load [kswapd]

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Message-ID: <1332269976.18960.449.camel@twins>
Date:	Tue, 20 Mar 2012 19:59:36 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Karol Šebesta <sebesta.karol@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-admin@...r.kernel.org,
	Rik van Riel <riel@...hat.com>
Subject: Re: extreme system load [kswapd]

On Tue, 2012-03-20 at 10:08 +0100, Karol Šebesta wrote:
> We have a problem on our production machine with high CPU utilization
> caused by kswapd3 daemon. Server is 128GB of physical memory and 81GB
> of SWAP.
> 
> 
> # cat /etc/redhat-release
> Red Hat Enterprise Linux Server release 5.6 (Tikanga) 

That's a very very old kernel, I would suggest you upgrade to something
that has the reclaim rewrite Rik did to deal with large memory systems.

I think they're in RHEL6, but I'm sure Rik knows.

Also, since you're running this dinosaur, contact RHT, they're the only
ones that care about it -- but I guess you're going to get the same
suggestion.
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