From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756094Ab2CTS7u (ORCPT ); Tue, 20 Mar 2012 14:59:50 -0400 Received: from merlin.infradead.org ([205.233.59.134]:55341 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755777Ab2CTS7s convert rfc822-to-8bit (ORCPT ); Tue, 20 Mar 2012 14:59:48 -0400 Message-ID: <1332269976.18960.449.camel@twins> Subject: Re: extreme system load [kswapd] From: Peter Zijlstra To: Karol =?UTF-8?Q?=C5=A0ebesta?= Cc: linux-kernel@vger.kernel.org, linux-admin@vger.kernel.org, Rik van Riel Date: Tue, 20 Mar 2012 19:59:36 +0100 In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT X-Mailer: Evolution 3.2.2- Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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.