Received: from localhost (unknown [200.46.204.183]) by developer.postgresql.org (Postfix) with ESMTP id 149092E007F for ; Fri, 11 Apr 2008 16:56:49 -0300 (ADT) Received: from developer.postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 70759-01-4 for ; Fri, 11 Apr 2008 16:56:43 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.5 Received: from westnet.com (westnet.com [216.187.52.2]) by developer.postgresql.org (Postfix) with ESMTP id EF85D2E008C for ; Fri, 11 Apr 2008 16:56:39 -0300 (ADT) Received: from westnet.com (localhost [127.0.0.1]) by westnet.com (8.14.0/8.14.0) with ESMTP id m3BJubZH025198; Fri, 11 Apr 2008 15:56:37 -0400 (EDT) Received: from localhost (gsmith@localhost) by westnet.com (8.14.0/8.13.2/Submit) with ESMTP id m3BJuaiD025193; Fri, 11 Apr 2008 15:56:37 -0400 (EDT) X-Authentication-Warning: westnet.com: gsmith owned process doing -bs Date: Fri, 11 Apr 2008 15:56:36 -0400 (EDT) From: Greg Smith X-X-Sender: gsmith@westnet.com To: Craig Ringer cc: pgsql-performance@postgresql.org Subject: Re: Performance increase with elevator=deadline In-Reply-To: <47FFA7FF.10801@postnewspapers.com.au> Message-ID: References: <47FFA7FF.10801@postnewspapers.com.au> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200804/160 X-Sequence-Number: 29653 On Sat, 12 Apr 2008, Craig Ringer wrote: > Speaking of I/O performance with PostgreSQL, has anybody here done any > testing to compare results with LVM to results with the same filesystem on a > conventionally partitioned or raw volume? There was some chatter on this topic last year; a quick search finds http://archives.postgresql.org/pgsql-performance/2007-06/msg00005.php which is a fair statement of the situation. I don't recall any specific benchmarks. -- * Greg Smith gsmith@gregsmith.com http://www.gregsmith.com Baltimore, MD