X-Original-To: pgsql-performance-postgresql.org@localhost.postgresql.org Received: from localhost (av.hub.org [200.46.204.144]) by svr1.postgresql.org (Postfix) with ESMTP id D396FD76A6 for ; Sun, 20 Nov 2005 09:25:09 -0400 (AST) Received: from svr1.postgresql.org ([200.46.204.71]) by localhost (av.hub.org [200.46.204.144]) (amavisd-new, port 10024) with ESMTP id 79129-05 for ; Sun, 20 Nov 2005 13:25:12 +0000 (GMT) X-Greylist: from auto-whitelisted by SQLgrey- Received: from cassarossa.samfundet.no (cassarossa.samfundet.no [129.241.93.19]) by svr1.postgresql.org (Postfix) with ESMTP id CDF4CD735B for ; Sun, 20 Nov 2005 09:05:24 -0400 (AST) Received: from trofast.ipv6.sesse.net ([2001:700:300:dc03:20e:cff:fe36:a766] helo=trofast.sesse.net) by cassarossa.samfundet.no with esmtp (Exim 4.50) id 1Edosn-0003oP-MP for pgsql-performance@postgresql.org; Sun, 20 Nov 2005 14:05:27 +0100 Received: from sesse by trofast.sesse.net with local (Exim 3.36 #1 (Debian)) id 1Edos2-0008Bd-00 for ; Sun, 20 Nov 2005 14:04:38 +0100 Date: Sun, 20 Nov 2005 14:04:38 +0100 From: "Steinar H. Gunderson" To: pgsql-performance@postgresql.org Subject: Re: Hardware/OS recommendations for large databases ( Message-ID: <20051120130438.GA31206@uio.no> Mail-Followup-To: pgsql-performance@postgresql.org References: <437E2DF2.50906@rentec.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: X-Operating-System: Linux 2.6.14 on a i686 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 required=5 tests=[none] X-Spam-Score: 0 X-Spam-Level: X-Archive-Number: 200511/409 X-Sequence-Number: 15666 On Sat, Nov 19, 2005 at 08:13:09AM -0800, Luke Lonergan wrote: > Iowait is time spent waiting on blocking io calls. To be picky, iowait is time spent in the idle task while the I/O queue is not empty. It does not matter if the I/O is blocking or not (from userspace's point of view), and if the I/O was blocking (say, PIO) from the kernel's point of view, it would be counted in system. /* Steinar */ -- Homepage: http://www.sesse.net/