From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Zijlstra Subject: Re: extreme system load [kswapd] Date: Tue, 20 Mar 2012 19:59:36 +0100 Message-ID: <1332269976.18960.449.camel@twins> References: Mime-Version: 1.0 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="iso-8859-1" To: Karol =?UTF-8?Q?=C5=A0ebesta?= Cc: linux-kernel@vger.kernel.org, linux-admin@vger.kernel.org, Rik van Riel On Tue, 2012-03-20 at 10:08 +0100, Karol =C5=A0ebesta 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. >=20 >=20 > # cat /etc/redhat-release > Red Hat Enterprise Linux Server release 5.6 (Tikanga)=20 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.