From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 81FA0CA9EAE for ; Tue, 29 Oct 2019 09:16:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3519020830 for ; Tue, 29 Oct 2019 09:16:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731581AbfJ2JQA (ORCPT ); Tue, 29 Oct 2019 05:16:00 -0400 Received: from mx2.suse.de ([195.135.220.15]:39554 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729876AbfJ2JP7 (ORCPT ); Tue, 29 Oct 2019 05:15:59 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id B3F7EAF6B; Tue, 29 Oct 2019 09:15:55 +0000 (UTC) Message-ID: Subject: Re: [RFC PATCH v3 00/16] Core scheduling v3 From: Dario Faggioli To: Aaron Lu , Aubrey Li Cc: Tim Chen , Julien Desfossez , "Li, Aubrey" , Subhra Mazumdar , Vineeth Remanan Pillai , Nishanth Aravamudan , Peter Zijlstra , Ingo Molnar , Thomas Gleixner , Paul Turner , Linus Torvalds , Linux List Kernel Mailing , =?ISO-8859-1?Q?Fr=E9d=E9ric?= Weisbecker , Kees Cook , Greg Kerr , Phil Auld , Valentin Schneider , Mel Gorman , Pawan Gupta , Paolo Bonzini Date: Tue, 29 Oct 2019 10:15:53 +0100 In-Reply-To: <277737d6034b3da072d3b0b808d2fa6e110038b0.camel@suse.com> References: <20190726152101.GA27884@sinkpad> <7dc86e3c-aa3f-905f-3745-01181a3b0dac@linux.intel.com> <20190802153715.GA18075@sinkpad> <69cd9bca-da28-1d35-3913-1efefe0c1c22@linux.intel.com> <20190911140204.GA52872@aaronlu> <7b001860-05b4-4308-df0e-8b60037b8000@linux.intel.com> <20190912120400.GA16200@aaronlu> <20190915141402.GA1349@aaronlu> <277737d6034b3da072d3b0b808d2fa6e110038b0.camel@suse.com> Organization: SUSE Content-Type: multipart/signed; micalg="pgp-sha256"; protocol="application/pgp-signature"; boundary="=-XbK6MDKfXOQ62Mn7nYyD" User-Agent: Evolution 3.34.1 MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-XbK6MDKfXOQ62Mn7nYyD Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2019-10-29 at 10:11 +0100, Dario Faggioli wrote: > On Sun, 2019-09-15 at 22:14 +0800, Aaron Lu wrote: > > I'm using the following branch as base which is v5.1.5 based: > > https://github.com/digitalocean/linux-coresched coresched-v3- > > v5.1.5- > > test > >=20 > > And I have pushed Tim's branch to: > > https://github.com/aaronlu/linux coresched-v3-v5.1.5-test-tim > >=20 > > Mine: > > https://github.com/aaronlu/linux coresched-v3-v5.1.5-test- > > core_vruntime > >=20 > Hello, >=20 > As anticipated, I've been trying to follow the development of this > feature and, in the meantime, I have done some benchmarks. >=20 > I actually have a lot of data (and am planning for more), so I am > sending a few emails, each one with a subset of the numbers in it, > instead than just one which would be beyond giant! :-) >=20 HACKBENCH-PROCESS-PIPES =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D http://xenbits.xen.org/people/dariof/benchmarks/results/linux/core-sched/mm= tests/boxes/wayrath/coresched-email-2_hackbench.txt v v = BM BM BM BM= BM BM BM-HT BM-noHT = HT noHT csc-HT csc_stallfix-HT= csc_tim-HT csc_vruntime-HT Amean 1 0.4372 ( 0.00%) 0.6714 * -53.57%* 0.4242 ( = 2.97%) 0.6654 * -52.20%* 1.1748 *-168.71%* 1.1666 *-166.83%*= 1.1496 *-162.95%* 1.3696 *-213.27%* Amean 3 1.1466 ( 0.00%) 2.0284 * -76.91%* 1.1700 ( -= 2.04%) 2.0320 * -77.22%* 6.8484 *-497.28%* 6.7128 *-485.45%*= 6.8068 *-493.65%* 7.9702 *-595.12%* Amean 5 2.0140 ( 0.00%) 2.7834 * -38.20%* 2.0116 ( = 0.12%) 2.6688 * -32.51%* 11.9494 *-493.32%* 11.9450 *-493.10%*= 12.0904 *-500.32%* 14.4190 *-615.94%* Amean 7 2.5396 ( 0.00%) 3.3064 * -30.19%* 2.6002 ( -= 2.39%) 2.9074 * -14.48%* 16.0142 *-530.58%* 16.3418 *-543.48%*= 17.0896 *-572.92%* 20.2050 *-695.60%* Amean 12 3.2930 ( 0.00%) 2.9830 ( 9.41%) 3.4226 ( -= 3.94%) 2.8522 ( 13.39%) 28.1482 *-754.79%* 27.3916 *-731.81%*= 28.5938 *-768.32%* 34.6184 *-951.27%* Amean 18 3.9452 ( 0.00%) 4.0806 ( -3.43%) 3.7950 ( = 3.81%) 3.8938 ( 1.30%) 41.7120 *-957.28%* 42.1062 *-967.28%*= 44.2136 *-1020.69%* 51.0200 *-1193.22%* Amean 24 4.1618 ( 0.00%) 4.8466 * -16.45%* 4.2258 ( -= 1.54%) 5.0720 * -21.87%* 56.8598 *-1266.23%* 57.3568 *-1278.17= %* 61.2660 *-1372.10%* 68.2538 *-1540.01%* Amean 30 4.7790 ( 0.00%) 5.9726 * -24.98%* 4.8756 ( -= 2.02%) 5.9434 * -24.36%* 72.1602 *-1409.94%* 75.8036 *-1486.18= %* 80.0066 *-1574.13%* 81.3768 *-1602.80%* Amean 32 5.1680 ( 0.00%) 6.6000 * -27.71%* 5.2004 ( -= 0.63%) 6.5490 * -26.72%* 78.1974 *-1413.11%* 82.9812 *-1505.67= %* 87.7340 *-1597.64%* 85.6876 *-1558.04%* Stddev 1 0.0173 ( 0.00%) 0.0624 (-259.99%) 0.0129 ( 2= 5.54%) 0.0451 (-160.36%) 0.0727 (-319.12%) 0.0954 (-450.05%)= 0.0545 (-214.16%) 0.0960 (-453.74%) Stddev 3 0.0471 ( 0.00%) 0.3035 (-544.20%) 0.0547 ( -1= 6.12%) 0.2745 (-482.52%) 0.2029 (-330.60%) 0.1102 (-133.97%)= 0.2391 (-407.38%) 0.1864 (-295.62%) Stddev 5 0.1492 ( 0.00%) 0.4178 (-180.05%) 0.1419 ( = 4.88%) 0.2569 ( -72.22%) 0.3878 (-159.96%) 0.2584 ( -73.22%)= 0.4259 (-185.47%) 0.3340 (-123.89%) Stddev 7 0.2077 ( 0.00%) 0.2941 ( -41.59%) 0.2281 ( -= 9.85%) 0.2049 ( 1.33%) 0.3922 ( -88.86%) 0.8178 (-293.78%)= 0.4064 ( -95.67%) 0.6127 (-195.02%) Stddev 12 0.5560 ( 0.00%) 0.2038 ( 63.34%) 0.2113 ( 6= 2.00%) 0.2490 ( 55.21%) 1.0797 ( -94.21%) 0.7564 ( -36.06%)= 1.0225 ( -83.91%) 1.5233 (-174.01%) Stddev 18 0.3556 ( 0.00%) 0.3110 ( 12.55%) 0.3054 ( 1= 4.11%) 0.1265 ( 64.43%) 1.0258 (-188.47%) 1.4386 (-304.53%)= 1.1818 (-232.33%) 2.6710 (-651.08%) Stddev 24 0.1844 ( 0.00%) 0.1614 ( 12.46%) 0.1135 ( 3= 8.46%) 0.3679 ( -99.54%) 2.0997 (-1038.84%) 1.1493 (-523.36%= ) 0.5214 (-182.79%) 2.9229 (-1485.35%) Stddev 30 0.1420 ( 0.00%) 0.0875 ( 38.37%) 0.1799 ( -2= 6.66%) 0.1076 ( 24.26%) 4.5079 (-3073.51%) 1.5704 (-1005.58= %) 1.4054 (-889.42%) 4.5743 (-3120.26%) Stddev 32 0.2184 ( 0.00%) 0.2427 ( -11.11%) 0.3143 ( -4= 3.92%) 0.3517 ( -61.01%) 3.7345 (-1609.81%) 1.3564 (-521.00%= ) 2.1822 (-899.11%) 4.0896 (-1772.40%) v v = VM VM VM VM= VM VM VM-HT VM-noHT = HT noHT csc-HT csc_stallfix-HT= csc_tim-HT csc_vruntime-HT Amean 1 0.6762 ( 0.00%) 1.6824 *-148.80%* 0.6630 ( = 1.95%) 1.5706 *-132.27%* 0.6600 ( 2.40%) 0.6514 ( 3.67%)= 0.6780 ( -0.27%) 0.6964 * -2.99%* Amean 3 1.7130 ( 0.00%) 2.2806 * -33.13%* 1.8074 * -= 5.51%* 2.1882 * -27.74%* 1.7992 ( -5.03%) 1.7896 * -4.47%*= 1.7760 ( -3.68%) 1.8264 * -6.62%* Amean 5 2.8688 ( 0.00%) 2.8048 ( 2.23%) 2.5880 * = 9.79%* 2.8474 ( 0.75%) 2.5486 * 11.16%* 2.7896 ( 2.76%)= 2.4402 * 14.94%* 2.6020 * 9.30%* Amean 7 3.3432 ( 0.00%) 3.3434 ( -0.01%) 3.4564 ( -= 3.39%) 3.4704 ( -3.80%) 3.2424 ( 3.02%) 3.5620 ( -6.54%)= 3.0352 ( 9.21%) 3.0874 ( 7.65%) Amean 12 5.8936 ( 0.00%) 4.9968 * 15.22%* 5.1560 * 1= 2.52%* 5.0670 * 14.03%* 4.2722 * 27.51%* 5.6570 ( 4.01%)= 4.8270 * 18.10%* 4.2514 * 27.86%* Amean 18 6.3938 ( 0.00%) 7.0542 ( -10.33%) 6.4900 ( -= 1.50%) 6.9682 ( -8.98%) 5.6478 ( 11.67%) 7.4324 ( -16.24%)= 6.3160 ( 1.22%) 6.5124 ( -1.85%) Amean 24 7.6278 ( 0.00%) 9.5096 * -24.67%* 7.0062 * = 8.15%* 9.0278 * -18.35%* 7.5650 ( 0.82%) 8.2604 ( -8.29%)= 8.5372 ( -11.92%) 7.7008 ( -0.96%) Amean 30 10.5534 ( 0.00%) 10.9456 ( -3.72%) 11.4470 ( -= 8.47%) 11.1330 ( -5.49%) 8.8486 ( 16.15%) 10.8508 ( -2.82%)= 12.6182 ( -19.57%) 10.5836 ( -0.29%) Amean 32 11.6024 ( 0.00%) 12.6052 ( -8.64%) 10.8236 ( = 6.71%) 11.2156 ( 3.33%) 9.0654 * 21.87%* 11.5074 ( 0.82%)= 10.3592 ( 10.72%) 11.7174 ( -0.99%) Stddev 1 0.0143 ( 0.00%) 0.3700 (-2480.08%) 0.0261 ( -= 82.29%) 0.1206 (-741.16%) 0.0444 (-209.74%) 0.0270 ( -88.42%= ) 0.0238 ( -65.73%) 0.0180 ( -25.17%) Stddev 3 0.0473 ( 0.00%) 0.1384 (-192.63%) 0.0739 ( -5= 6.38%) 0.0714 ( -51.01%) 0.0931 ( -96.94%) 0.0517 ( -9.28%)= 0.0960 (-103.02%) 0.0553 ( -17.04%) Stddev 5 0.1236 ( 0.00%) 0.2251 ( -82.10%) 0.1607 ( -2= 9.98%) 0.1464 ( -18.41%) 0.1319 ( -6.69%) 0.1842 ( -48.96%)= 0.0647 ( 47.66%) 0.1977 ( -59.92%) Stddev 7 0.3597 ( 0.00%) 0.1105 ( 69.27%) 0.2288 ( 3= 6.38%) 0.1335 ( 62.90%) 0.3131 ( 12.94%) 0.2958 ( 17.76%)= 0.1581 ( 56.05%) 0.2361 ( 34.37%) Stddev 12 0.4677 ( 0.00%) 0.0846 ( 81.91%) 0.6319 ( -3= 5.11%) 0.1526 ( 67.37%) 0.3591 ( 23.23%) 0.6898 ( -47.48%)= 0.4853 ( -3.76%) 0.2963 ( 36.64%) Stddev 18 1.2289 ( 0.00%) 0.1849 ( 84.95%) 1.1160 ( = 9.18%) 0.2497 ( 79.68%) 0.9843 ( 19.90%) 0.9542 ( 22.35%)= 0.6621 ( 46.12%) 0.7668 ( 37.60%) Stddev 24 0.5202 ( 0.00%) 0.9344 ( -79.60%) 0.1940 ( 6= 2.71%) 0.4706 ( 9.53%) 0.8362 ( -60.73%) 1.0819 (-107.96%)= 1.0229 ( -96.63%) 0.8881 ( -70.72%) Stddev 30 2.1557 ( 0.00%) 0.7984 ( 62.96%) 1.2499 ( 4= 2.02%) 0.9804 ( 54.52%) 0.4846 ( 77.52%) 1.2901 ( 40.15%)= 1.5532 ( 27.95%) 1.2932 ( 40.01%) Stddev 32 2.2255 ( 0.00%) 1.1321 ( 49.13%) 2.2380 ( -= 0.56%) 0.2127 ( 90.44%) 0.3654 ( 83.58%) 1.5727 ( 29.33%)= 2.3291 ( -4.66%) 2.0936 ( 5.93%) v v = VM VM VM VM= VM VM VM-v4-HT VM-v4-noHT = v4-HT v4-noHT v4-csc-HT v4-csc_stallfix-HT= v4-csc_tim-HT v4-csc_vruntime-HT Amean 1 1.2194 ( 0.00%) 1.1974 ( 1.80%) 1.0308 * 1= 5.47%* 1.1054 * 9.35%* 1.0522 * 13.71%* 1.2290 ( -0.79%)= 1.1392 * 6.58%* 1.0524 * 13.70%* Amean 3 2.2568 ( 0.00%) 2.0588 ( 8.77%) 2.0708 ( = 8.24%) 2.2352 ( 0.96%) 2.1808 ( 3.37%) 2.2820 ( -1.12%)= 2.1682 ( 3.93%) 2.2598 ( -0.13%) Amean 5 2.9848 ( 0.00%) 2.9912 ( -0.21%) 2.4938 * 1= 6.45%* 2.4634 * 17.47%* 2.6890 ( 9.91%) 2.8908 ( 3.15%)= 2.8636 ( 4.06%) 2.4158 * 19.06%* Amean 7 3.4500 ( 0.00%) 3.2538 ( 5.69%) 3.3646 ( = 2.48%) 3.2666 ( 5.32%) 3.0800 ( 10.72%) 4.2206 ( -22.34%)= 3.1016 ( 10.10%) 3.2186 ( 6.71%) Amean 12 6.0414 ( 0.00%) 5.0624 ( 16.20%) 5.1276 ( 1= 5.13%) 5.1066 ( 15.47%) 4.7728 * 21.00%* 5.5068 ( 8.85%)= 4.7544 * 21.30%* 5.8920 ( 2.47%) Amean 16 7.5510 ( 0.00%) 7.6888 ( -1.82%) 6.9732 ( = 7.65%) 5.9098 * 21.73%* 6.5542 * 13.20%* 6.9492 ( 7.97%)= 6.4372 * 14.75%* 6.1968 * 17.93%* Stddev 1 0.0786 ( 0.00%) 0.1166 ( -48.34%) 0.1762 (-12= 4.09%) 0.0712 ( 9.45%) 0.1541 ( -95.99%) 0.0814 ( -3.55%)= 0.0452 ( 42.57%) 0.1817 (-131.05%) Stddev 3 0.2220 ( 0.00%) 0.1887 ( 15.03%) 0.2174 ( = 2.07%) 0.1368 ( 38.37%) 0.1928 ( 13.17%) 0.4342 ( -95.57%)= 0.2353 ( -5.97%) 0.1753 ( 21.06%) Stddev 5 0.4586 ( 0.00%) 0.4689 ( -2.23%) 0.3202 ( 3= 0.19%) 0.2666 ( 41.88%) 0.3108 ( 32.24%) 0.2876 ( 37.29%)= 0.4067 ( 11.33%) 0.3010 ( 34.37%) Stddev 7 0.3769 ( 0.00%) 0.5242 ( -39.09%) 0.2523 ( 3= 3.06%) 0.2498 ( 33.71%) 0.4527 ( -20.13%) 1.5089 (-300.36%)= 0.3998 ( -6.09%) 0.4018 ( -6.62%) Stddev 12 1.0604 ( 0.00%) 0.5194 ( 51.02%) 0.5646 ( 4= 6.75%) 0.5255 ( 50.45%) 0.4872 ( 54.06%) 0.3447 ( 67.49%)= 0.5492 ( 48.21%) 0.5487 ( 48.26%) Stddev 16 0.6245 ( 0.00%) 0.5220 ( 16.40%) 0.6914 ( -1= 0.71%) 0.6984 ( -11.83%) 0.3543 ( 43.27%) 0.5137 ( 17.74%)= 0.5083 ( 18.61%) 1.0744 ( -72.04%) v v = VMx2 VMx2 VMx2 VMx2= VMx2 VMx2 VMx2-HT VMx2-noHT = HT noHT csc-HT csc_stallfix-HT= csc_tim-HT csc_vruntime-HT Amean 1 0.6780 ( 0.00%) 2.1522 *-217.43%* 1.6790 *-14= 7.64%* 2.2440 *-230.97%* 15.6090 *-2202.21%* 9.1920 *-1255.75= %* 2.0732 *-205.78%* 2.2390 *-230.24%* Amean 3 1.8452 ( 0.00%) 3.2456 * -75.89%* 2.5214 * -3= 6.65%* 3.3944 * -83.96%* 13.7258 *-643.87%* 9.7654 *-429.23%*= 2.6668 * -44.53%* 2.9044 * -57.40%* Amean 5 2.8564 ( 0.00%) 4.2548 * -48.96%* 3.2500 * -1= 3.78%* 4.3958 * -53.89%* 11.6808 *-308.93%* 8.4724 *-196.61%*= 3.4000 * -19.03%* 3.5298 * -23.58%* Amean 7 3.3712 ( 0.00%) 5.1056 * -51.45%* 4.1636 * -2= 3.50%* 4.9874 * -47.94%* 14.0516 (-316.81%) 9.1454 *-171.28%*= 4.1396 * -22.79%* 4.3570 * -29.24%* Amean 12 4.8134 ( 0.00%) 7.4516 * -54.81%* 6.1254 * -2= 7.26%* 7.3488 * -52.67%* 13.7680 *-186.03%* 13.7400 *-185.45%*= 6.0424 * -25.53%* 6.3404 * -31.72%* Amean 18 6.1980 ( 0.00%) 10.4126 * -68.00%* 8.5942 * -3= 8.66%* 9.7554 * -57.40%* 10.7234 * -73.01%* 13.5214 *-118.16%*= 8.6628 * -39.77%* 8.5910 * -38.61%* Amean 24 8.2116 ( 0.00%) 12.7570 * -55.35%* 10.9386 * -3= 3.21%* 12.9032 * -57.13%* 17.8492 *-117.37%* 14.4432 * -75.89%*= 10.7488 * -30.90%* 11.1930 * -36.31%* Amean 30 9.3264 ( 0.00%) 15.3704 * -64.81%* 13.6630 * -4= 6.50%* 15.4806 * -65.99%* 16.9272 * -81.50%* 18.4184 * -97.49%*= 13.6174 * -46.01%* 13.5026 * -44.78%* Amean 32 10.1954 ( 0.00%) 16.5494 * -62.32%* 14.7450 * -4= 4.62%* 16.4650 * -61.49%* 13.9146 * -36.48%* 17.5790 * -72.42%*= 14.6072 * -43.27%* 14.0346 * -37.66%* Stddev 1 0.0129 ( 0.00%) 0.2665 (-1959.36%) 0.2262 (-1= 647.54%) 0.0703 (-443.26%) 9.5450 (-73651.40%) 6.3226 (-4875= 2.57%) 0.1736 (-1241.41%) 0.3070 (-2272.09%) Stddev 3 0.1156 ( 0.00%) 0.3653 (-215.89%) 0.1388 ( -2= 0.00%) 0.2067 ( -78.77%) 3.3781 (-2821.39%) 3.2241 (-2688.20= %) 0.0970 ( 16.10%) 0.1247 ( -7.87%) Stddev 5 0.0817 ( 0.00%) 0.2968 (-263.19%) 0.0938 ( -1= 4.79%) 0.1367 ( -67.25%) 3.1273 (-3726.47%) 3.9175 (-4693.34= %) 0.1155 ( -41.31%) 0.1864 (-128.10%) Stddev 7 0.1190 ( 0.00%) 0.1337 ( -12.31%) 0.3136 (-16= 3.48%) 0.2034 ( -70.91%) 17.1856 (-14336.96%) 2.8676 (-2308.9= 4%) 0.0794 ( 33.32%) 0.1362 ( -14.42%) Stddev 12 0.5237 ( 0.00%) 0.2929 ( 44.08%) 0.1386 ( 7= 3.53%) 0.2330 ( 55.51%) 7.1869 (-1272.26%) 8.0085 (-1429.13= %) 0.2535 ( 51.59%) 0.1441 ( 72.49%) Stddev 18 0.4791 ( 0.00%) 0.1528 ( 68.10%) 0.4254 ( 1= 1.21%) 0.2953 ( 38.37%) 2.8492 (-494.71%) 4.3767 (-813.54%)= 0.3205 ( 33.10%) 0.3094 ( 35.43%) Stddev 24 1.1591 ( 0.00%) 0.2616 ( 77.43%) 0.2446 ( 7= 8.90%) 0.4363 ( 62.36%) 5.3380 (-360.53%) 3.2433 (-179.81%)= 0.2704 ( 76.67%) 0.4402 ( 62.02%) Stddev 30 0.6561 ( 0.00%) 0.4008 ( 38.91%) 0.2670 ( 5= 9.31%) 0.1451 ( 77.88%) 4.5765 (-597.54%) 4.2380 (-545.95%)= 0.4768 ( 27.33%) 0.2693 ( 58.96%) Stddev 32 1.2197 ( 0.00%) 0.4459 ( 63.44%) 0.5496 ( 5= 4.94%) 0.4179 ( 65.74%) 1.3553 ( -11.12%) 4.3537 (-256.96%)= 0.5602 ( 54.07%) 0.5312 ( 56.45%) So, situation looks pretty *terrible* on baremetal. Well, something to investigate, I guess. In VMs, on the other hand, things don't look too bad. Although, it's a bit weird that the benchmark seems to be sensitive to HT when run on baremetal, but not so much when run in VMs. Among the various core scheduling implementations/patches, plain v3 seems to have issues with this workload, while Tim's and vruntime are better. It is confirmed that, in virtualization scenario, under overcommittment, core scheduling is more effective than disabling HyperThreading, at least either with Tim's or with vruntime patches. Overhead wise, it is an hard call. Numbers vary a lot, and I think each group of measurements needs to be looked at carefully to come up with a sensible analysis. Overhead is there, that's for sure, in the baremetal case. Also, it looks more severe when HT is disabled (e.g., comapre v-BM-noHT with BM- noHT). In virt cases, it's really an hard call. E.g., when a VM with 4 vCPUs is used, core scheduling seems to be able to make the system significantly faster! :-O --=20 Dario Faggioli, Ph.D http://about.me/dario.faggioli Virtualization Software Engineer SUSE Labs, SUSE https://www.suse.com/ ------------------------------------------------------------------- <> (Raistlin Majere) --=-XbK6MDKfXOQ62Mn7nYyD Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEES5ssOj3Vhr0WPnOLFkJ4iaW4c+4FAl24A0kACgkQFkJ4iaW4 c+41WRAA1Fymi0jurt1HSRQrrZgabOco9bkFgt9M+BK0zWXf9yPFWJFPeecVF8P8 gf3lUy8NskSHxeY8ibRMnqqHBJyQ4feng+43YFhDTRnnGFg5wV5CUQvz4kZe+Nb9 OWtHFnLI4gBqsk8CGa6dUKnLWDi8CTj5NPZRs732cT6Ul+Bq6ohDpi1syo2xpn3+ lnoWyILRg2tvEvBHdszpL3NJsWFioA947TvJ7W98vVei6vpyFO9aTP2cjyX4YMx/ beyuSx3RxXvMFva3Bu0HgNo4FwBVjNFW3tQtPhlV1Q3KcGfuh3NSObas31AzJmV+ qZMN0iL4JY3A3FKHsWN5PMKSKZAoYSh9z03ZmDC2r0ZtHZ9TM4p+M0RQ9Luiv2L2 u71aFeXe9Ck+i4fTypg2Vrs+XEXF4gjhWFVlV2+EzKLye6lEXjYp84TUAxDbu8om 0Oqj5wJPcOR7CLgsxpTgEnds4FK9PTbPjWmWEGKr5gkGkq6kdZgeZnApkUnn0GO9 yoDHdCwvBBr2VjaTr0gTAYVuspb7liolpFTMwxspHUqCQ5hjMO81Lirs2iAEW8kv anD8ih0O39M2/yIbTclIYY7y1+XuIT51+PZ/wCyiR0/v6+Y1tMTcRZ7fTeHm4v/q ESdeVxle2VFLlvPJ6WldiN4yj1OznY51pOYKHDl8SGyIOlnaAJk= =itAS -----END PGP SIGNATURE----- --=-XbK6MDKfXOQ62Mn7nYyD--