Received: from magus.postgresql.org ([87.238.57.229]) by malur.postgresql.org with esmtp (Exim 4.72) (envelope-from ) id 1TCEef-0003uA-O7 for pgsql-performance@postgresql.org; Thu, 13 Sep 2012 19:00:49 +0000 Received: from mh10.mail.rice.edu ([128.42.201.30]) by magus.postgresql.org with esmtp (Exim 4.72) (envelope-from ) id 1TCEec-0006Uh-Kl for pgsql-performance@postgresql.org; Thu, 13 Sep 2012 19:00:49 +0000 Received: from mh10.mail.rice.edu (localhost.localdomain [127.0.0.1]) by mh10.mail.rice.edu (Postfix) with ESMTP id F2860603DF for ; Thu, 13 Sep 2012 14:00:43 -0500 (CDT) Received: from mh10.mail.rice.edu (localhost.localdomain [127.0.0.1]) by mh10.mail.rice.edu (Postfix) with ESMTP id F13AB603DC for ; Thu, 13 Sep 2012 14:00:43 -0500 (CDT) X-Virus-Scanned: by amavis-2.7.0 at mh10.mail.rice.edu, auth channel Received: from mh10.mail.rice.edu ([127.0.0.1]) by mh10.mail.rice.edu (mh10.mail.rice.edu [127.0.0.1]) (amavis, port 10026) with ESMTP id UrXiTA-cau9h for ; Thu, 13 Sep 2012 14:00:43 -0500 (CDT) Received: from descarte (staff-71-wless94-039.rice.edu [10.71.94.39]) (using TLSv1 with cipher RC4-MD5 (128/128 bits)) (No client certificate requested) (Authenticated sender: reedstrm) by mh10.mail.rice.edu (Postfix) with ESMTPSA id D510A603DA for ; Thu, 13 Sep 2012 14:00:43 -0500 (CDT) Received: by descarte (Postfix, from userid 1000) id 5B3BE3C0858; Thu, 13 Sep 2012 14:00:43 -0500 (CDT) Date: Thu, 13 Sep 2012 14:00:43 -0500 From: Ross Reedstrom To: pgsql-performance@postgresql.org Subject: Re: Linux machine aggressively clearing cache Message-ID: <20120913190043.GD26745@rice.edu> References: <807948699.229132.1332959858793.JavaMail.root@mail-1.01.com> <4F765515.3050203@agliodbs.com> <4F86F92E.2000108@pinpointresearch.com> <4F8F57B9.2030301@agliodbs.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4F8F57B9.2030301@agliodbs.com> User-Agent: Mutt/1.5.21 (2010-09-15) X-Pg-Spam-Score: -2.4 (--) X-Archive-Number: 201209/61 X-Sequence-Number: 47807 On Wed, Apr 18, 2012 at 05:09:29PM -0700, Josh Berkus wrote: > On 4/12/12 8:47 AM, Steve Crawford wrote: > > On 03/30/2012 05:51 PM, Josh Berkus wrote: > >> > >> So this turned out to be a Linux kernel issue. Will document it on > >> www.databasesoup.com. > > Anytime soon? About to build two PostgreSQL servers and wondering if you > > have uncovered a kernel version or similar issue to avoid. > > Yeah, I'll blog it. Since I'm doing some backlog catchup, I'll do some community/archive service and provide the link: http://www.databasesoup.com/2012/04/red-hat-kernel-cache-clearing-issue.html Ross -- Ross Reedstrom, Ph.D. reedstrm@rice.edu Systems Engineer & Admin, Research Scientist phone: 713-348-6166 Connexions http://cnx.org fax: 713-348-3665 Rice University MS-375, Houston, TX 77005 GPG Key fingerprint = F023 82C8 9B0E 2CC6 0D8E F888 D3AE 810E 88F0 BEDE