From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: multipart/mixed; boundary="===============3142625677211653073==" MIME-Version: 1.0 From: Mel Gorman To: lkp@lists.01.org Subject: Re: [mm] b191f9b106e: -8.8% netperf.time.minor_page_faults Date: Wed, 01 Apr 2015 08:35:57 +0100 Message-ID: <20150401073557.GB3921@suse.de> In-Reply-To: <1427858614.17170.102.camel@intel.com> List-Id: --===============3142625677211653073== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable On Wed, Apr 01, 2015 at 11:23:34AM +0800, Huang Ying wrote: > FYI, we noticed the below changes on > = > git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master > commit b191f9b106ea1a24a711dbebb2925d3313da5852 ("mm: numa: preserve PTE = write permissions across a NUMA hinting fault") > = > = > testbox/testcase/testparams: lkp-ne02/netperf/performance-300s-200%-TCP_S= ENDFILE > = > bea66fbd11af1ca9 b191f9b106ea1a24a711dbebb2 = > ---------------- -------------------------- = > %stddev %change %stddev > \ | \ = > 13115 =C2=B1 0% -8.8% 11968 =C2=B1 0% netperf.time.mino= r_page_faults > 65.63 =C2=B1 6% -14.6% 56.05 =C2=B1 7% netperf.time.user= _time > 65.63 =C2=B1 6% -14.6% 56.05 =C2=B1 7% time.user_time Hmmm, is this a positive report? It looks like it -- fewer faults at least. Lower user_time is ambiguous because the elapsed time is not included in the report and netperf has variable time depending on whether it can get a confident result or not. --===============3142625677211653073==-- From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752855AbbDAHgH (ORCPT ); Wed, 1 Apr 2015 03:36:07 -0400 Received: from cantor2.suse.de ([195.135.220.15]:57964 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752115AbbDAHgD (ORCPT ); Wed, 1 Apr 2015 03:36:03 -0400 Date: Wed, 1 Apr 2015 08:35:57 +0100 From: Mel Gorman To: Huang Ying Cc: Linus Torvalds , LKML , LKP ML Subject: Re: [LKP] [mm] b191f9b106e: -8.8% netperf.time.minor_page_faults Message-ID: <20150401073557.GB3921@suse.de> References: <1427858614.17170.102.camel@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <1427858614.17170.102.camel@intel.com> 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 Wed, Apr 01, 2015 at 11:23:34AM +0800, Huang Ying wrote: > FYI, we noticed the below changes on > > git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master > commit b191f9b106ea1a24a711dbebb2925d3313da5852 ("mm: numa: preserve PTE write permissions across a NUMA hinting fault") > > > testbox/testcase/testparams: lkp-ne02/netperf/performance-300s-200%-TCP_SENDFILE > > bea66fbd11af1ca9 b191f9b106ea1a24a711dbebb2 > ---------------- -------------------------- > %stddev %change %stddev > \ | \ > 13115 ± 0% -8.8% 11968 ± 0% netperf.time.minor_page_faults > 65.63 ± 6% -14.6% 56.05 ± 7% netperf.time.user_time > 65.63 ± 6% -14.6% 56.05 ± 7% time.user_time Hmmm, is this a positive report? It looks like it -- fewer faults at least. Lower user_time is ambiguous because the elapsed time is not included in the report and netperf has variable time depending on whether it can get a confident result or not.