Content-Type: multipart/mixed; boundary="===============3614762146858485015==" MIME-Version: 1.0 From: Aaron Lu To: lkp@lists.01.org Subject: Re: [lkp-robot] [sched/fair] d519329f72: unixbench.score -9.9% regression Date: Wed, 24 Oct 2018 14:41:00 +0800 Message-ID: <20181024064100.GA27054@intel.com> In-Reply-To: <20180402032000.GD3101@yexl-desktop> List-Id: --===============3614762146858485015== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable On Mon, Apr 02, 2018 at 11:20:00AM +0800, Ye, Xiaolong wrote: > = > Greeting, > = > FYI, we noticed a -9.9% regression of unixbench.score due to commit: > = > = > commit: d519329f72a6f36bc4f2b85452640cfe583b4f81 ("sched/fair: Update uti= l_est only on util_avg updates") > https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master > = > in testcase: unixbench > on test machine: 8 threads Intel(R) Core(TM) i7 CPU 870 @ 2.93GHz with 6G= memory > with following parameters: > = > runtime: 300s > nr_task: 100% > test: execl > = > test-description: UnixBench is the original BYTE UNIX benchmark suite aim= s to test performance of Unix-like system. > test-url: https://github.com/kdlucas/byte-unixbench I tested this workload on different machines with this commit d519329f72a6f36bc4f2b85452 and its parent a07630b8b2c16f82, I also tested with v4.19-rc8 to see if the regression is gone - the performance drop is there with v4.19-rc8 and with different machines so I assume this regression is not solved yet. Here are detailed data: cmdline used to run this workload: ./Run execl -c $nr_cpu -i 30 lkp-ivb-d04(Ivybridge desktop, 4 CPUs) a07630b8b2c16f82 d519329f72a6f36bc4f2b85452 ---------------- -------------------------- %stddev %change %stddev \ | \ 2924 -8.7% 2669 unixbench.score = a07630b8b2c16f82fd5b71d890079f4dd7599c1d/avg.json: "unixbench.score": 2924= .3333333333335, d519329f72a6f36bc4f2b85452640cfe583b4f81/avg.json: "unixbench.score": 2669= .5333333333333, v4.19-rc8/avg.json: "unixbench.score": 2611.733333333333, lkp-hsw-d01(Haswell desktop, 8 CPUs) a07630b8b2c16f82 d519329f72a6f36bc4f2b85452 ---------------- -------------------------- %stddev %change %stddev \ | \ 7090 -9.4% 6421 unixbench.score = a07630b8b2c16f82fd5b71d890079f4dd7599c1d/avg.json: "unixbench.score": 7090= .400000000001, d519329f72a6f36bc4f2b85452640cfe583b4f81/avg.json: "unixbench.score": 6421= .233333333333, v4.19-rc8/avg.json: "unixbench.score": 6431.933333333333, lkp-skl-2sp2(2 sockets Skylake, 80 CPUs) a07630b8b2c16f82 d519329f72a6f36bc4f2b85452 ---------------- -------------------------- = = %stddev %change %stddev = = \ | \ = = 9657 =C2=B1 2% -3.3% 9334 unixbench.score = a07630b8b2c16f82fd5b71d890079f4dd7599c1d/avg.json: "unixbench.score": 9657= .6, d519329f72a6f36bc4f2b85452640cfe583b4f81/avg.json: "unixbench.score": 9334= .9, v4.19-rc8/avg.json: "unixbench.score": 9278.333333333334, Please let me know if you need other information, thanks. --===============3614762146858485015==--