X-Original-To: pgsql-performance-postgresql.org@localhost.postgresql.org Received: from localhost (av.hub.org [200.46.204.144]) by postgresql.org (Postfix) with ESMTP id F39299DCDCE for ; Wed, 1 Feb 2006 13:55:36 -0400 (AST) Received: from postgresql.org ([200.46.204.71]) by localhost (av.hub.org [200.46.204.144]) (amavisd-new, port 10024) with ESMTP id 98434-04 for ; Wed, 1 Feb 2006 13:55:33 -0400 (AST) X-Greylist: from auto-whitelisted by SQLgrey- Received: from cassarossa.samfundet.no (cassarossa.samfundet.no [129.241.93.19]) by postgresql.org (Postfix) with ESMTP id 88A2E9DCD17 for ; Wed, 1 Feb 2006 13:55:31 -0400 (AST) Received: from trofast.sesse.net ([129.241.93.32]) by cassarossa.samfundet.no with esmtp (Exim 4.50) id 1F4MCY-0004q9-W0 for pgsql-performance@postgresql.org; Wed, 01 Feb 2006 18:55:31 +0100 Received: from sesse by trofast.sesse.net with local (Exim 3.36 #1 (Debian)) id 1F4MCd-0004AE-00 for ; Wed, 01 Feb 2006 18:55:35 +0100 Date: Wed, 1 Feb 2006 18:55:35 +0100 From: "Steinar H. Gunderson" To: pgsql-performance@postgresql.org Subject: Re: Huge Data sets, simple queries Message-ID: <20060201175535.GA15442@uio.no> Mail-Followup-To: pgsql-performance@postgresql.org References: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: X-Operating-System: Linux 2.6.14.3 on a x86_64 X-Message-Flag: Outlook? --> http://www.mozilla.org/products/thunderbird/ User-Agent: Mutt/1.5.11 X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, score=0.073 required=5 tests=[AWL=0.073] X-Spam-Score: 0.073 X-Spam-Level: X-Archive-Number: 200602/17 X-Sequence-Number: 17003 On Wed, Feb 01, 2006 at 09:42:12AM -0800, Luke Lonergan wrote: > This is actually interesting overall - I think what this might be showing is > that the Linux SW RAID1 is alternating I/Os to the mirror disks from > different processes (LWP or HWP both maybe?), but not within one process. Having read the code, I'm fairly certain it doesn't really care what process anything is coming from. /* Steinar */ -- Homepage: http://www.sesse.net/