From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: multipart/mixed; boundary="===============1333158288392635806==" MIME-Version: 1.0 From: Huang Ying To: lkp@lists.01.org Subject: Re: [kernel] fc7f0dd3817: -2.1% will-it-scale.per_thread_ops Date: Tue, 27 Jan 2015 09:17:11 +0800 Message-ID: <1422321431.24875.35.camel@intel.com> In-Reply-To: <23E39399-135D-485B-8AF6-FB5D2B874A9A@me.com> List-Id: --===============1333158288392635806== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable On Mon, 2015-01-26 at 12:36 -0700, Louis Langholtz wrote: > Hi Huang (and others on the lkp(a)01.org mailing list), > = > Not sure how to interpret the numbers you provided. Is there a web > page that you would suggest looking at that I might read up? Sorry we have no web page. Most words in the email is straightforward. testbox/testcase/testparams: lituya/will-it-scale/powersave-mmap2 test machine: lituya, it is a Haswell-EP machine test case: will-it-scale (a benchmark to measure performance via invoking some system call in a loop) test params: powersave-mmap2: powersave CPU frequency governor is used, the sub test case in will-it-scale is: mmap2 7ad4b4ae5757b896 fc7f0dd381720ea5ee5818645f = Here is the parent commit ID and the commit ID for your patch. ---------------- -------------------------- = %stddev %change %stddev \ | \ = 252693 =C2=B1 0% -2.2% 247031 =C2=B1 0% will-it-scale.per_t= hread_ops 252693 and 247031 is the score from the benchmark 0% is the standard deviation for the score -2.2% is the change between the parent and your patch. > It wouldn't surprise me if the changes made resulted in slightly > decreased performance - the number of commands shown in disassembly of > the code not surprisingly increases. Best Regards, Huang, Ying > On Jan 21, 2015, at 7:39 PM, Huang Ying wrote: > = > > FYI, we noticed the below changes on > > = > > commit fc7f0dd381720ea5ee5818645f7d0e9dece41cb0 ("kernel: avoid overflo= w in cmp_range") > > = > > = > > testbox/testcase/testparams: lituya/will-it-scale/powersave-mmap2 > > = > > 7ad4b4ae5757b896 fc7f0dd381720ea5ee5818645f = > > ---------------- -------------------------- = > > %stddev %change %stddev > > \ | \ ... > > Disclaimer: > > Results have been estimated based on internal Intel analysis and are pr= ovided > > for informational purposes only. Any difference in system hardware or s= oftware > > design or configuration may affect actual performance. > > = > > = > > Thanks, > > Huang, Ying > > = > > _______________________________________________ > > LKP mailing list > > LKP(a)linux.intel.com > > = > = --===============1333158288392635806==--