From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751344AbcFFJvm (ORCPT ); Mon, 6 Jun 2016 05:51:42 -0400 Received: from mga14.intel.com ([192.55.52.115]:16530 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750884AbcFFJvl (ORCPT ); Mon, 6 Jun 2016 05:51:41 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.26,426,1459839600"; d="scan'208";a="996058455" Date: Mon, 6 Jun 2016 12:51:36 +0300 From: "Kirill A. Shutemov" To: kernel test robot Cc: Linus Torvalds , Michal Hocko , Minchan Kim , Rik van Riel , Mel Gorman , Michal Hocko , Vinayak Menon , Andrew Morton , LKML , lkp@01.org Subject: Re: [lkp] [mm] 5c0a85fad9: unixbench.score -6.3% regression Message-ID: <20160606095136.GA79951@black.fi.intel.com> References: <20160606022724.GA26227@yexl-desktop> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20160606022724.GA26227@yexl-desktop> User-Agent: Mutt/1.5.23.1 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jun 06, 2016 at 10:27:24AM +0800, kernel test robot wrote: > > FYI, we noticed a -6.3% regression of unixbench.score due to commit: > > commit 5c0a85fad949212b3e059692deecdeed74ae7ec7 ("mm: make faultaround produce old ptes") > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master > > in testcase: unixbench > on test machine: lituya: 16 threads Haswell High-end Desktop (i7-5960X 3.0G) with 16G memory > with following parameters: cpufreq_governor=performance/nr_task=1/test=shell8 > > > Details are as below: > --------------------------------------------------------------------------------------------------> > > > ========================================================================================= > compiler/cpufreq_governor/kconfig/nr_task/rootfs/tbox_group/test/testcase: > gcc-4.9/performance/x86_64-rhel/1/debian-x86_64-2015-02-07.cgz/lituya/shell8/unixbench > > commit: > 4b50bcc7eda4d3cc9e3f2a0aa60e590fedf728c5 > 5c0a85fad949212b3e059692deecdeed74ae7ec7 > > 4b50bcc7eda4d3cc 5c0a85fad949212b3e059692de > ---------------- -------------------------- > fail:runs %reproduction fail:runs > | | | > 3:4 -75% :4 kmsg.DHCP/BOOTP:Reply_not_for_us,op[#]xid[#] > %stddev %change %stddev > \ | \ > 14321 ± 0% -6.3% 13425 ± 0% unixbench.score > 1996897 ± 0% -6.1% 1874635 ± 0% unixbench.time.involuntary_context_switches > 1.721e+08 ± 0% -6.2% 1.613e+08 ± 0% unixbench.time.minor_page_faults > 758.65 ± 0% -3.0% 735.86 ± 0% unixbench.time.system_time > 387.66 ± 0% +5.4% 408.49 ± 0% unixbench.time.user_time > 5950278 ± 0% -6.2% 5583456 ± 0% unixbench.time.voluntary_context_switches That's weird. I don't understand why the change would reduce number or minor faults. It should stay the same on x86-64. Rise of user_time is puzzling too. Hm. Is reproducible? Across reboot? -- Kirill A. Shutemov