From owner-freebsd-questions@FreeBSD.ORG Mon Mar 9 15:50:09 2009 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 1A2C3106566C for ; Mon, 9 Mar 2009 15:50:09 +0000 (UTC) (envelope-from nicolas@boiteameuh.org) Received: from popple.boiteameuh.org (popple.boiteameuh.org [82.232.215.170]) by mx1.freebsd.org (Postfix) with ESMTP id CAC478FC18 for ; Mon, 9 Mar 2009 15:50:08 +0000 (UTC) (envelope-from nicolas@boiteameuh.org) Received: by popple.boiteameuh.org (Postfix, from userid 1000) id 521E84EFF3; Mon, 9 Mar 2009 16:30:58 +0100 (CET) Date: Mon, 9 Mar 2009 16:30:58 +0100 From: Nicolas Haller To: freebsd-questions@freebsd.org Message-ID: <20090309153057.GD1481@boiteameuh.org> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline User-Agent: Mutt/1.5.17+20080114 (2008-01-14) Subject: Busy disk and page fault X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 09 Mar 2009 15:50:09 -0000 Hi all, I'm asking myself about a problem I have with a Postgresql server on FreeBSD 7.1-RELEASE. The server is overload, the disk is 100% busy with 250 write operations per second and a throuput of 6MB/s. My first idea is because of mass random access/write on the disk. But I also see the server can make 20k page fault per second. So, did you think I really have a disk contention or this high number of page fault can be a problem (and if it can, how to resolve it). Thanks, -- Nicolas Haller