From: James Bottomley Subject: Re: [PATCH 3/3] mm: slub: Default slub_max_order to 0 Date: Thu, 12 May 2011 13:36:15 -0500 Message-ID: <1305225375.2575.65.camel@mulgrave.site> References: <1305127773-10570-1-git-send-email-mgorman@suse.de> <1305127773-10570-4-git-send-email-mgorman@suse.de> <1305213359.2575.46.camel@mulgrave.site> <1305214993.2575.50.camel@mulgrave.site> <20110512154649.GB4559@redhat.com> <1305216023.2575.54.camel@mulgrave.site> <1305217843.2575.57.camel@mulgrave.site> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Cc: Christoph Lameter , Dave Jones , Mel Gorman , Andrew Morton , Colin King , Raghavendra D Prabhu , Jan Kara , Chris Mason , Rik van Riel , Johannes Weiner , linux-fsdevel , linux-mm , linux-kernel , linux-ext4 , Andrea Arcangeli To: Pekka Enberg Return-path: Received: from bedivere.hansenpartnership.com ([66.63.167.143]:44718 "EHLO bedivere.hansenpartnership.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752293Ab1ELSgU (ORCPT ); Thu, 12 May 2011 14:36:20 -0400 In-Reply-To: Sender: linux-ext4-owner@vger.kernel.org List-ID: On Thu, 2011-05-12 at 20:11 +0300, Pekka Enberg wrote: > On Thu, May 12, 2011 at 8:06 PM, Pekka Enberg wrote: > > On Thu, May 12, 2011 at 7:30 PM, James Bottomley > > wrote: > >> So suggest an alternative root cause and a test to expose it. > > > > Is your .config available somewhere, btw? > > If it's this: > > http://pkgs.fedoraproject.org/gitweb/?p=kernel.git;a=blob_plain;f=config-x86_64-generic;hb=HEAD > > I'd love to see what happens if you disable > > CONFIG_TRANSPARENT_HUGEPAGE=y > > because that's going to reduce high order allocations as well, no? So yes, it's a default FC15 config. Disabling THP was initially tried a long time ago and didn't make a difference (it was originally suggested by Chris Mason). James