From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753194AbaHSOgn (ORCPT ); Tue, 19 Aug 2014 10:36:43 -0400 Received: from cantor2.suse.de ([195.135.220.15]:53716 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753074AbaHSOgm (ORCPT ); Tue, 19 Aug 2014 10:36:42 -0400 Date: Tue, 19 Aug 2014 15:34:28 +0100 From: Mel Gorman To: Fengguang Wu Cc: LKML , lkp@01.org Subject: Re: [mm] f7b5d647946: -3.0% dbench.throughput-MB/sec Message-ID: <20140819143428.GC10146@suse.de> References: <20140819044134.GB8798@localhost> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20140819044134.GB8798@localhost> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Aug 19, 2014 at 12:41:34PM +0800, Fengguang Wu wrote: > Hi Mel, > > We noticed a minor dbench throughput regression on commit > f7b5d647946aae1647bf5cd26c16b3a793c1ac49 ("mm: page_alloc: abort fair > zone allocation policy when remotes nodes are encountered"). > > testcase: ivb44/dbench/100% > > bb0b6dffa2ccfbd f7b5d647946aae1647bf5cd26 > --------------- ------------------------- > 25692 ± 0% -3.0% 24913 ± 0% dbench.throughput-MB/sec > 6974259 ± 6% -12.1% 6127616 ± 0% meminfo.DirectMap2M > 18.43 ± 0% -4.6% 17.59 ± 0% turbostat.RAM_W > 9302 ± 0% -3.6% 8965 ± 1% time.user_time > 1425791 ± 1% -2.0% 1396598 ± 0% time.involuntary_context_switches > > Disclaimer: > Results have been estimated based on internal Intel analysis and are provided > for informational purposes only. Any difference in system hardware or software > design or configuration may affect actual performance. > DirectMap2M changing is a major surprise and doesn't make sense for this machine. Did the amount of memory in the machine change between two tests? -- Mel Gorman SUSE Labs