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So >>> we enable 63 rx queues. But we found the rate of interrupt growth >>> on cpu 0~15 is faster than other cpus(almost twice). >> ... >>> I am confused that why ixgbe NIC can dispatch the packets >>> to the rx queues that not specified in RSS configuration. >> >> Hypothesis: it isn't doing so, RX is only happening on cpus (and >> queues) 0-15, but the other CPUs are still sending traffic and >> thus getting TX completion interrupts from their TX queues. >> `ethtool -S` output has per-queue traffic stats which should >> confirm this. >> > > I use ethtool -S to check the rx_queus stats and here is the result. > > According to the below stats, all cpus have new packets received. + Alex and Piotr What's your ntuple filter setting? If it's off, I suspect it may be the Flow Director ATR (Application Targeting Routing) feature which will utilize all queues. I believe if you turn on ntuple filters this will turn that feature off. Thanks, Tony > > cpu t1(bytes) t2(bytes) delta(bytes) > > 0 154155550267550 154156433828875 883561325 > 1 148748566285840 148749509346247 943060407 > 2 148874911191685 148875798038140 886846455 > 3 152483460327704 152484251468998 791141294 > 4 147790981836915 147791775847804 794010889 > 5 146047892285722 146048778285682 885999960 > 6 142880516825921 142881213804363 696978442 > 7 152016735168735 152017707542774 972374039 > 8 146019936404393 146020739070311 802665918 > 9 147448522715540 147449258018186 735302646 > 10 145865736299432 145866601503106 865203674 > 11 149548527982122 149549289026453 761044331 > 12 146848384328236 146849303547769 919219533 > 13 152942139118542 152942769029253 629910711 > 14 150884661854828 150885556866976 895012148 > 15 149222733506734 149223510491115 776984381 > 16 34150226069524 34150375855113 149785589 > 17 34115700500819 34115914271025 213770206 > 18 33906215129998 33906448044501 232914503 > 19 33983812095357 33983986258546 174163189 > 20 34156349675011 34156565159083 215484072 > 21 33574293379024 33574490695725 197316701 > 22 33438129453422 33438297911151 168457729 > 23 32967454521585 32967612494711 157973126 > 24 33507443427266 33507604828468 161401202 > 25 33413275870121 33413433901940 158031819 > 26 33852322542796 33852527061150 204518354 > 27 33131162685385 33131330621474 167936089 > 28 33407661780251 33407823112381 161332130 > 29 34256799173845 34256944837757 145663912 > 30 33814458585183 33814623673528 165088345 > 31 33848638714862 33848775218038 136503176 > 32 18683932398308 18684069540891 137142583 > 33 19454524281229 19454647908293 123627064 > 34 19717744365436 19717900618222 156252786 > 35 20295086765202 20295245869666 159104464 > 36 20501853066588 20502000738936 147672348 > 37 20954631043374 20954797204375 166161001 > 38 21102911073326 21103062510369 151437043 > 39 21376404644179 21376515307288 110663109 > 40 20935812784743 20935983891491 171106748 > 41 20721278456831 20721435955715 157498884 > 42 21268291801465 21268425244578 133443113 > 43 21661413672829 21661629019091 215346262 > 44 21696437732484 21696568800049 131067565 > 45 21027869000890 21028020401214 151400324 > 46 21707137252644 21707293761990 156509346 > 47 20655623913790 20655740452889 116539099 > 48 32692002128477 32692138244468 136115991 > 49 33548445851486 33548569927672 124076186 > 50 33197264968787 33197448645817 183677030 > 51 33379544010500 33379746565576 202555076 > 52 33503579011721 33503722596159 143584438 > 53 33145734550468 33145892305819 157755351 > 54 33422692741858 33422844156764 151414906 > 55 32750945531107 32751131302251 185771144 > 56 33404955373530 33405157766253 202392723 > 57 33701185654471 33701313174725 127520254 > 58 33014531699810 33014700058409 168358599 > 59 32948906758429 32949151147605 244389176 > 60 33470813725985 33470993164755 179438770 > 61 33803771479735 33803971758441 200278706 > 62 33509751180818 33509926649969 175469151 > > Thanks! > >> (But Eric is right that if you _want_ RX to use every CPU you >> should just change the indirection table.) >