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Date: Fri, 06 Feb 2015 18:24:02 -0800 From: Eric Dumazet <eric.dumazet@...il.com> To: Tom Herbert <therbert@...gle.com> Cc: David Miller <davem@...emloft.net>, netdev <netdev@...r.kernel.org>, Ying Cai <ycai@...gle.com>, Willem de Bruijn <willemb@...gle.com> Subject: Re: [PATCH net-next] net: rfs: add hash collision detection On Fri, 2015-02-06 at 14:21 -0800, Tom Herbert wrote: > Acked-by: Tom Herbert <therbert@...gle.com> > > Eric, looks awesome! Can you share any performance numbers? Right, numbers are awesome. I flood one target with ~2.3 Mpps UDP packets coming from random IP addresses. UDP server uses SO_REUSEPORT with 8 sockets (I have 8 rx queues on the host) I force a small RFS table to show that hash collisions no longer matter : echo 512 >/proc/sys/net/core/rps_sock_flow_entries softnettop tool (displaying /proc/net/softnet_stat in realtime) shows that before starting the TCP flows, only 8 cpus are receiving and process NIC irqs. cpu: recv drop time rps 26: 586720 0 0 0 29: 586982 0 0 0 32: 588582 0 0 0 35: 589266 0 0 0 38: 587796 0 0 0 41: 588146 0 0 0 44: 588158 0 0 0 47: 587548 0 0 0 *: 4703282 0 0 5 Then I start 200 netperf -t TCP_RR When the 200 TCP_RR flows start, we can see load nicely shifting, but the UDP packets still not use RFS. TCP fl cpu: recv drop time rps 0: 4254 0 0 1427 1: 4472 0 0 1460 2: 3070 0 0 1132 3: 4210 0 0 1417 4: 4472 0 0 1488 5: 2146 0 0 869 6: 4163 0 0 1456 7: 4354 0 0 1468 8: 3254 0 0 1170 9: 4468 0 0 1479 10: 4449 0 0 1521 11: 2788 0 0 1070 12: 5902 0 0 1665 13: 6160 0 0 1692 14: 2319 0 0 945 15: 5850 0 0 1686 16: 5716 0 0 1643 17: 3388 0 0 1224 18: 5936 0 0 1724 19: 6040 0 0 1691 20: 2962 0 0 1076 21: 5784 0 0 1696 22: 6094 0 0 1717 23: 2748 0 0 999 24: 1392 0 0 638 25: 1158 0 0 524 26: 577970 0 0 77 27: 1410 0 0 644 28: 1166 0 0 544 29: 575270 0 0 5 30: 1158 0 0 523 31: 972 0 0 444 32: 574306 0 0 181 33: 1248 0 0 575 34: 1094 0 0 502 35: 577116 0 0 69 36: 2142 0 0 893 37: 1384 0 0 587 38: 577470 0 0 7 39: 2029 0 0 856 40: 1858 0 0 780 41: 574744 0 0 46 42: 1946 0 0 806 43: 1711 0 0 719 44: 570190 0 0 81 45: 2210 0 0 872 46: 1670 0 0 702 47: 572758 0 0 68 *: 4729371 0 0 44858 cpu: recv drop time rps 0: 48770 0 0 13778 1: 49198 0 0 13979 2: 24580 0 0 8631 3: 48272 0 0 13642 4: 48578 0 0 13831 5: 23716 0 0 8631 6: 48034 0 0 13648 7: 49408 0 0 13848 8: 26147 0 0 9068 9: 48678 0 0 13843 10: 49515 0 0 13931 11: 29836 0 0 10079 12: 45828 0 0 13331 13: 46654 0 0 13553 14: 19850 0 0 7452 15: 44382 0 0 13083 16: 44667 0 0 13072 17: 27196 0 0 9429 18: 44574 0 0 13069 19: 45076 0 0 13193 20: 27352 0 0 9329 21: 45468 0 0 13183 22: 46264 0 0 13435 23: 23598 0 0 8485 24: 14248 0 0 6061 25: 13624 0 0 5851 26: 508738 0 0 828 27: 14516 0 0 6214 28: 13354 0 0 5700 29: 512006 0 0 604 30: 14686 0 0 6249 31: 13866 0 0 5944 32: 491190 0 0 1101 33: 14628 0 0 6237 34: 14164 0 0 6025 35: 499178 0 0 1513 36: 13138 0 0 5687 37: 11964 0 0 5220 38: 523120 0 0 413 39: 13565 0 0 5808 40: 12742 0 0 5500 41: 485162 0 0 1343 42: 13254 0 0 5686 43: 12096 0 0 5254 44: 464680 0 0 1615 45: 13450 0 0 5781 46: 12400 0 0 5346 47: 493070 0 0 935 *: 5148480 0 0 388438 cpu: recv drop time rps 0: 46596 0 0 13977 1: 48633 0 0 14331 2: 24006 0 0 8909 3: 47844 0 0 14080 4: 47742 0 0 14067 5: 26642 0 0 9605 6: 47796 0 0 14117 7: 48806 0 0 14432 8: 27936 0 0 9934 9: 48034 0 0 14233 10: 48892 0 0 14377 11: 30650 0 0 10512 12: 45651 0 0 13614 13: 45439 0 0 13536 14: 24337 0 0 8877 15: 45379 0 0 13666 16: 45695 0 0 13643 17: 26552 0 0 9452 18: 45513 0 0 13608 19: 46588 0 0 13930 20: 26242 0 0 9273 21: 45521 0 0 13670 22: 46255 0 0 13729 23: 28166 0 0 9842 24: 13998 0 0 6086 25: 12518 0 0 5512 26: 503796 0 0 621 27: 13732 0 0 6002 28: 12802 0 0 5611 29: 507766 0 0 689 30: 13968 0 0 6044 31: 13012 0 0 5648 32: 488760 0 0 938 33: 13969 0 0 6044 34: 12666 0 0 5545 35: 497482 0 0 1497 36: 13074 0 0 5715 37: 12187 0 0 5338 38: 520414 0 0 496 39: 13752 0 0 5988 40: 12046 0 0 5297 41: 480412 0 0 904 42: 13436 0 0 5845 43: 11978 0 0 5286 44: 461146 0 0 1288 45: 12982 0 0 5655 46: 12872 0 0 5643 47: 488788 0 0 1066 *: 5122471 0 0 398172 cpu: recv drop time rps 0: 46970 0 0 13467 1: 48129 0 0 13914 2: 25876 0 0 9206 3: 47672 0 0 13723 4: 48566 0 0 13875 5: 25575 0 0 9009 6: 47342 0 0 13673 7: 48636 0 0 13889 8: 28038 0 0 9722 9: 48298 0 0 13875 10: 48662 0 0 13911 11: 28412 0 0 9777 12: 45025 0 0 13323 13: 45620 0 0 13422 14: 20808 0 0 7800 15: 44481 0 0 13271 16: 45032 0 0 13324 17: 25698 0 0 9155 18: 45125 0 0 13483 19: 46371 0 0 13627 20: 27234 0 0 9437 21: 44899 0 0 13234 22: 46065 0 0 13530 23: 24118 0 0 8629 24: 14416 0 0 6137 25: 13690 0 0 5863 26: 508418 0 0 905 27: 14780 0 0 6295 28: 13288 0 0 5716 29: 509010 0 0 1136 30: 15080 0 0 6443 31: 13378 0 0 5771 32: 489950 0 0 1302 33: 14410 0 0 6157 34: 13712 0 0 5894 35: 496760 0 0 1153 36: 13906 0 0 5978 37: 12198 0 0 5326 38: 520846 0 0 444 39: 13206 0 0 5709 40: 13020 0 0 5636 41: 482136 0 0 1029 42: 13068 0 0 5616 43: 12982 0 0 5636 44: 462626 0 0 1378 45: 13342 0 0 5765 46: 12784 0 0 5608 47: 491690 0 0 717 *: 5131348 0 0 391890 cpu: recv drop time rps 0: 45472 0 0 13241 1: 46628 0 0 13471 2: 25556 0 0 8988 3: 46082 0 0 13369 4: 45573 0 0 13263 5: 28061 0 0 9506 6: 45806 0 0 13329 7: 46890 0 0 13631 8: 28321 0 0 9711 9: 45826 0 0 13339 10: 46522 0 0 13569 11: 27168 0 0 9467 12: 47750 0 0 13717 13: 47630 0 0 13619 14: 20660 0 0 7846 15: 47224 0 0 13707 16: 48439 0 0 13884 17: 23894 0 0 8646 18: 47019 0 0 13666 19: 47532 0 0 13811 20: 26957 0 0 9465 21: 47380 0 0 13703 22: 48520 0 0 14014 23: 24379 0 0 8775 24: 13100 0 0 5633 25: 13210 0 0 5696 26: 506252 0 0 887 27: 13564 0 0 5865 28: 12258 0 0 5294 29: 510674 0 0 1436 30: 12892 0 0 5551 31: 13112 0 0 5668 32: 492734 0 0 1633 33: 13480 0 0 5775 34: 12400 0 0 5367 35: 497366 0 0 1371 36: 14236 0 0 6109 37: 12728 0 0 5552 38: 519158 0 0 365 39: 14322 0 0 6096 40: 13432 0 0 5801 41: 481236 0 0 832 42: 14584 0 0 6242 43: 14200 0 0 6099 44: 463266 0 0 1242 45: 14130 0 0 6056 46: 13574 0 0 5824 47: 490142 0 0 778 *: 5131339 0 0 390909 cpu: recv drop time rps 0: 46704 0 0 13515 1: 46175 0 0 13421 2: 22761 0 0 8388 3: 47142 0 0 13758 4: 46908 0 0 13532 5: 27770 0 0 9681 6: 47210 0 0 13638 7: 47645 0 0 13657 8: 28668 0 0 9829 9: 47806 0 0 13763 10: 47638 0 0 13621 11: 30896 0 0 10260 12: 47778 0 0 13721 13: 48396 0 0 13753 14: 18130 0 0 7339 15: 46427 0 0 13522 16: 47578 0 0 13659 17: 25465 0 0 8996 18: 47052 0 0 13537 19: 48184 0 0 13839 20: 27105 0 0 9526 21: 48230 0 0 13697 22: 49176 0 0 13919 23: 20728 0 0 7863 24: 13626 0 0 5844 25: 11770 0 0 5112 26: 532288 0 0 549 27: 13960 0 0 6030 28: 13534 0 0 5863 29: 537130 0 0 1374 30: 14702 0 0 6259 31: 13776 0 0 5923 32: 520046 0 0 1242 33: 14292 0 0 6095 34: 13684 0 0 5868 35: 524026 0 0 1466 36: 14931 0 0 6375 37: 10918 0 0 4738 38: 545740 0 0 119 39: 15372 0 0 6580 40: 13984 0 0 5992 41: 507908 0 0 1185 42: 15540 0 0 6595 43: 14538 0 0 6243 44: 486684 0 0 1202 45: 15100 0 0 6417 46: 13423 0 0 5781 47: 515604 0 0 333 *: 5354148 0 0 393619 cpu: recv drop time rps 0: 49981 0 0 14007 1: 51769 0 0 14362 2: 21066 0 0 7982 3: 51477 0 0 14326 4: 50566 0 0 14090 5: 21334 0 0 8299 6: 50853 0 0 14238 7: 52091 0 0 14379 8: 22447 0 0 8502 9: 51318 0 0 14373 10: 52682 0 0 14605 11: 31434 0 0 10542 12: 45672 0 0 13385 13: 46592 0 0 13574 14: 19514 0 0 7595 15: 45765 0 0 13409 16: 45518 0 0 13260 17: 22627 0 0 8526 18: 45697 0 0 13382 19: 46958 0 0 13667 20: 25211 0 0 9039 21: 46581 0 0 13685 22: 46623 0 0 13493 23: 22625 0 0 8326 24: 15724 0 0 6612 25: 13978 0 0 5959 26: 555430 0 0 296 27: 16266 0 0 6831 28: 14319 0 0 6139 29: 557434 0 0 232 30: 17372 0 0 7232 31: 14600 0 0 6244 32: 541476 0 0 601 33: 17265 0 0 7225 34: 15755 0 0 6693 35: 550066 0 0 1764 36: 14554 0 0 6240 37: 12873 0 0 5575 38: 569992 0 0 323 39: 14685 0 0 6306 40: 13202 0 0 5755 41: 531414 0 0 571 42: 15002 0 0 6467 43: 13336 0 0 5746 44: 512364 0 0 1019 45: 14469 0 0 6158 46: 13390 0 0 5813 47: 541256 0 0 644 *: 5562623 0 0 397491 cpu: recv drop time rps 0: 49230 0 0 13561 1: 48356 0 0 13262 2: 25240 0 0 8872 3: 48772 0 0 13475 4: 49256 0 0 13579 5: 26330 0 0 9117 6: 49474 0 0 13638 7: 50230 0 0 13808 8: 27763 0 0 9450 9: 49538 0 0 13641 10: 50428 0 0 13888 11: 26006 0 0 9110 12: 46391 0 0 13273 13: 46546 0 0 13354 14: 18240 0 0 7144 15: 45833 0 0 13084 16: 46194 0 0 13148 17: 26255 0 0 9218 18: 46387 0 0 13280 19: 47606 0 0 13546 20: 22683 0 0 8411 21: 47091 0 0 13458 22: 47880 0 0 13577 23: 22779 0 0 8252 24: 15551 0 0 6458 25: 14146 0 0 5986 26: 558688 0 0 779 27: 15856 0 0 6559 28: 13980 0 0 5886 29: 562008 0 0 1002 30: 16178 0 0 6766 31: 14736 0 0 6213 32: 542428 0 0 1121 33: 15828 0 0 6541 34: 14944 0 0 6336 35: 547546 0 0 829 36: 13882 0 0 5942 37: 11804 0 0 5165 38: 571056 0 0 227 39: 15422 0 0 6529 40: 12786 0 0 5514 41: 532399 0 0 1073 42: 14810 0 0 6316 43: 13254 0 0 5721 44: 509890 0 0 649 45: 14717 0 0 6280 46: 12160 0 0 5294 47: 538686 0 0 547 *: 5557263 0 0 388879 cpu: recv drop time rps 0: 48494 0 0 13610 1: 48450 0 0 13667 2: 18908 0 0 7389 3: 47301 0 0 13496 4: 48212 0 0 13626 5: 24524 0 0 8817 6: 48055 0 0 13477 7: 50226 0 0 13908 8: 26093 0 0 9198 9: 49130 0 0 13734 10: 50252 0 0 14079 11: 30880 0 0 10275 12: 46759 0 0 13098 13: 48464 0 0 13494 14: 21192 0 0 7887 15: 47295 0 0 13352 16: 48224 0 0 13641 17: 27363 0 0 9500 18: 46990 0 0 13353 19: 48559 0 0 13695 20: 24237 0 0 8670 21: 48024 0 0 13583 22: 49013 0 0 13651 23: 22739 0 0 8365 24: 14664 0 0 6240 25: 10190 0 0 4505 26: 556422 0 0 301 27: 14702 0 0 6260 28: 13725 0 0 5924 29: 560214 0 0 826 30: 15144 0 0 6412 31: 14250 0 0 6075 32: 540102 0 0 972 33: 15122 0 0 6408 34: 14358 0 0 6157 35: 549364 0 0 1676 36: 14894 0 0 6302 37: 13023 0 0 5569 38: 571308 0 0 496 39: 15154 0 0 6391 40: 14430 0 0 6116 41: 530950 0 0 945 42: 15478 0 0 6571 43: 13633 0 0 5849 44: 511994 0 0 1052 45: 14892 0 0 6327 46: 13216 0 0 5686 47: 541362 0 0 559 *: 5557975 0 0 391184 cpu: recv drop time rps 0: 49414 0 0 13841 1: 50425 0 0 14087 2: 19888 0 0 7699 3: 49729 0 0 14059 4: 49847 0 0 13937 5: 20906 0 0 7860 6: 49566 0 0 13901 7: 49948 0 0 13943 8: 26602 0 0 9373 9: 50721 0 0 14104 10: 50977 0 0 14123 11: 31706 0 0 10511 12: 47948 0 0 13746 13: 48042 0 0 13843 14: 17106 0 0 7039 15: 47788 0 0 13749 16: 47675 0 0 13651 17: 22882 0 0 8337 18: 47063 0 0 13544 19: 48308 0 0 13791 20: 23578 0 0 8637 21: 48128 0 0 13847 22: 48846 0 0 13843 23: 20482 0 0 7744 24: 15436 0 0 6517 25: 12962 0 0 5592 26: 555592 0 0 216 27: 16100 0 0 6811 28: 13358 0 0 5712 29: 558520 0 0 572 30: 15792 0 0 6618 31: 14698 0 0 6277 32: 540146 0 0 1166 33: 15970 0 0 6711 34: 15034 0 0 6345 35: 548184 0 0 2099 36: 15194 0 0 6493 37: 12204 0 0 5338 38: 570088 0 0 77 39: 15828 0 0 6732 40: 13156 0 0 5694 41: 528860 0 0 906 42: 15874 0 0 6783 43: 13476 0 0 5795 44: 510034 0 0 973 45: 15476 0 0 6624 46: 13382 0 0 5816 47: 538046 0 0 551 *: 5550985 0 0 395627 cpu: recv drop time rps 0: 42896 0 0 12157 1: 43502 0 0 12338 2: 24072 0 0 8449 3: 42853 0 0 12258 4: 43146 0 0 12331 5: 21194 0 0 7741 6: 42003 0 0 12066 7: 43034 0 0 12182 8: 22830 0 0 7946 9: 43633 0 0 12347 10: 43731 0 0 12329 11: 24231 0 0 8449 12: 43542 0 0 12251 13: 44341 0 0 12409 14: 19231 0 0 7209 15: 43392 0 0 12284 16: 43544 0 0 12189 17: 24620 0 0 8463 18: 42781 0 0 12012 19: 44263 0 0 12439 20: 22462 0 0 8016 21: 43984 0 0 12512 22: 44554 0 0 12435 23: 19194 0 0 7287 24: 13028 0 0 5565 25: 11452 0 0 4959 26: 558724 0 0 850 27: 13408 0 0 5708 28: 11022 0 0 4745 29: 559438 0 0 645 30: 13428 0 0 5695 31: 12946 0 0 5524 32: 543112 0 0 1045 33: 13006 0 0 5520 34: 12110 0 0 5191 35: 547556 0 0 838 36: 13546 0 0 5723 37: 12582 0 0 5456 38: 571372 0 0 424 39: 14040 0 0 5898 40: 12936 0 0 5525 41: 536642 0 0 978 42: 14164 0 0 5957 43: 13158 0 0 5671 44: 518283 0 0 975 45: 13834 0 0 5860 46: 11914 0 0 5093 47: 542846 0 0 489 *: 5457580 0 0 354433 TCP_RR workload ends.... cpu: recv drop time rps 26: 588684 0 0 0 29: 589572 0 0 0 32: 589626 0 0 0 35: 588128 0 0 0 38: 589176 0 0 0 41: 589258 0 0 0 44: 589546 0 0 0 47: 587540 0 0 0 *: 4711633 0 0 12 Thanks -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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