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Within a 15ms time interval (99058.151147 -> 99058.167775), no real-time threads were scheduled, >  including the swapper idle thread. We have a 1ms-polling-rt-task running on CPU1, but it was also not scheduled during this period. >  Even the RTDM interrupts from peripherals were not responded to or processed. What could be the reason for this? > >   Architecture： x86_64 >   linux kernel：5.10.199-dovetail1 This version is 2 years old. Did you also check if the latest release (v5.10.245-cip65-dovetail1) has this issue? >   cobalt：3.2.4 >   kernel cmdline: xenomai.supported_cpus=0xf idle=halt nosmap > >   Thread-name CPU PRIO >   main-thread 0 26 >   rt-task1 1 86 >   rt-task3 1 91 >   rt-task4 1 85 > 1ms-polling-rt-task 1 94 >   rt-task2 2 85 >   rt-task5 2 92 >   rt-task6 2 92 >   rt-task7 2 85 >   rt-task8 2 85 >   rt-task13 2 90 >   rt-task15 2 85 >   kernel-drv-task11 2 98 >   kernel-drv-task10 3 94 >   kernel-drv-task12 3 98 >   kernel-drv-task14 3 98 > >  perf record -e cobalt_core:cobalt_schedule > >   swapper 0 [001] 99058.149903: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task1 56487 [001] 99058.149905: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [002] 99058.149930: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task2 56508 [002] 99058.149932: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [002] 99058.150029: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task2 56508 [002] 99058.150031: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [001] 99058.150034: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task3 56485 [001] 99058.150035: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task3 56485 [001] 99058.150036: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task4 56486 [001] 99058.150037: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [001] 99058.150052: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task1 56487 [001] 99058.150055: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [002] 99058.150073: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task5 56510 [002] 99058.150075: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [002] 99058.150078: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task6 56507 [002] 99058.150079: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [002] 99058.150127: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task7 56499 [002] 99058.150131: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task7 56499 [002] 99058.150147: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task7 56499 [002] 99058.150148: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task2 56508 [002] 99058.150149: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task8 56496 [002] 99058.150150: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [001] 99058.150184: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task3 56485 [001] 99058.150185: cobalt_core:cobalt_schedule: status=0x10000000 >   t-task3 56485 [001] 99058.150186: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task4 56486 [001] 99058.150187: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [001] 99058.150202: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task1 56487 [001] 99058.150205: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [002] 99058.150246: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task2 56508 [002] 99058.150248: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [001] 99058.150334: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task3 56485 [001] 99058.150335: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task3 56485 [001] 99058.150336: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task4 56486 [001] 99058.150337: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [002] 99058.150345: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task2 56508 [002] 99058.150347: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [001] 99058.150352: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task1 56487 [001] 99058.150355: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [003] 99058.150366: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [002] 99058.150372: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task5 56510 [002] 99058.150374: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [002] 99058.150376: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task6 56507 [002] 99058.150378: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [002] 99058.150381: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task7 56499 [002] 99058.150383: cobalt_core:cobalt_schedule: status=0x10000000 > kernel-drv-task10 24070 [003] 99058.150387: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [002] 99058.150444: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task2 56508 [002] 99058.150446: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [002] 99058.150447: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task8 56496 [002] 99058.150448: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [001] 99058.150484: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task3 56485 [001] 99058.150485: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task3 56485 [001] 99058.150486: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task4 56486 [001] 99058.150487: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [001] 99058.150502: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task1 56487 [001] 99058.150504: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [003] 99058.150505: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task1 56487 [001] 99058.150505: cobalt_core:cobalt_schedule: status=0x10000000 > kernel-drv-task10 24070 [003] 99058.150517: cobalt_core:cobalt_schedule: status=0x10000000 > main-thread 24485 [002] 99058.150543: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task2 56508 [002] 99058.150544: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [001] 99058.150564: cobalt_core:cobalt_schedule: status=0x10000000 > 1ms-polling-rt-task 56488 [001] 99058.150567: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [001] 99058.150611: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task1 56487 [001] 99058.150613: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [002] 99058.150630: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task7 56499 [002] 99058.150632: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [001] 99058.150634: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task3 56485 [001] 99058.150635: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task3 56485 [001] 99058.150636: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task4 56486 [001] 99058.150637: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [002] 99058.150642: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task2 56508 [002] 99058.150643: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [002] 99058.150671: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task5 56510 [002] 99058.150673: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [002] 99058.150675: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task6 56507 [002] 99058.150677: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [002] 99058.150740: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task2 56508 [002] 99058.150742: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [002] 99058.150745: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task8 56496 [002] 99058.150747: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [001] 99058.150761: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task1 56487 [001] 99058.150763: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [001] 99058.150783: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task3 56485 [001] 99058.150785: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task3 56485 [001] 99058.150786: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task4 56486 [001] 99058.150787: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [002] 99058.150839: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task2 56508 [002] 99058.150841: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [002] 99058.150879: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task7 56499 [002] 99058.150881: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [001] 99058.150911: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task1 56487 [001] 99058.150913: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [001] 99058.150933: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task3 56485 [001] 99058.150934: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task3 56485 [001] 99058.150935: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task4 56486 [001] 99058.150936: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [002] 99058.150938: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task2 56508 [002] 99058.150940: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [002] 99058.150970: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task5 56510 [002] 99058.150971: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [002] 99058.150974: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task6 56507 [002] 99058.150975: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [002] 99058.151037: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task2 56508 [002] 99058.151039: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [002] 99058.151044: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task8 56496 [002] 99058.151046: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [001] 99058.151060: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task1 56487 [001] 99058.151063: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [001] 99058.151082: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task3 56485 [001] 99058.151084: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task3 56485 [001] 99058.151085: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task4 56486 [001] 99058.151086: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [002] 99058.151138: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task7 56499 [002] 99058.151143: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task2 56508 [002] 99058.151147: cobalt_core:cobalt_schedule: status=0x10000000 > (---schedule delay 15ms---) >   swapper 0 [003] 99058.167775: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [001] 99058.167776: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [002] 99058.167777: cobalt_core:cobalt_schedule: status=0x10000000 > 1ms-polling-rt-task 56488 [001] 99058.167792: cobalt_core:cobalt_schedule: status=0x10000000 > kernel-drv-task11 24077 [002] 99058.167794: cobalt_core:cobalt_schedule: status=0x10000000 > 1ms-polling-rt-task 56488 [001] 99058.167795: cobalt_core:cobalt_schedule: status=0x10000000 > kernel-drv-task12 24088 [003] 99058.167797: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task3 56485 [001] 99058.167798: cobalt_core:cobalt_schedule: status=0x10000000 > kernel-drv-task11 24077 [002] 99058.167801: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task5 56510 [002] 99058.167803: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task1 56487 [001] 99058.167804: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task6 56507 [002] 99058.167805: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task4 56486 [001] 99058.167807: cobalt_core:cobalt_schedule: status=0x10000000 > rt-task13 56506 [002] 99058.167808: cobalt_core:cobalt_schedule: status=0x10000000 > kernel-drv-task10 24070 [003] 99058.167809: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task2 56508 [002] 99058.167810: cobalt_core:cobalt_schedule: status=0x10000000 > kernel-drv-task10 24070 [003] 99058.167811: cobalt_core:cobalt_schedule: status=0x10000000 > rt-task13 56506 [002] 99058.167816: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [003] 99058.167817: cobalt_core:cobalt_schedule: status=0x10000000 > rt-task13 56506 [002] 99058.167824: cobalt_core:cobalt_schedule: status=0x10000000 > rt-task13 56506 [002] 99058.167826: cobalt_core:cobalt_schedule: status=0x10000000 > kernel-drv-task10 24070 [003] 99058.167827: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task8 56496 [002] 99058.167828: cobalt_core:cobalt_schedule: status=0x10000000 > kernel-drv-task10 24070 [003] 99058.167829: cobalt_core:cobalt_schedule: status=0x10000000 > rt-task13 56506 [002] 99058.167833: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [003] 99058.167834: cobalt_core:cobalt_schedule: status=0x10000000 > kernel-drv-task10 24070 [003] 99058.167843: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [001] 99058.167893: cobalt_core:cobalt_schedule: status=0x10000000 > rt-task13 56506 [002] 99058.167894: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task7 56499 [002] 99058.167896: cobalt_core:cobalt_schedule: status=0x10000000 > 1ms-polling-rt-task 56488 [001] 99058.167897: cobalt_core:cobalt_schedule: status=0x10000000 > rt-task15 56598 [002] 99058.167898: cobalt_core:cobalt_schedule: status=0x10000000 > rt-task13 56506 [002] 99058.167906: cobalt_core:cobalt_schedule: status=0x10000000 > rt-task13 56506 [002] 99058.167921: cobalt_core:cobalt_schedule: status=0x10000000 > rt-task15 56598 [002] 99058.167933: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task2 56508 [002] 99058.167934: cobalt_core:cobalt_schedule: status=0x10000000 >  main-thread 24483 [001] 99058.167945: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task3 56485 [001] 99058.167948: cobalt_core:cobalt_schedule: status=0x10000000 >  main-thread 56538 [003] 99058.167950: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task3 56485 [001] 99058.167950: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task3 56485 [001] 99058.167952: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task3 56485 [001] 99058.167953: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task3 56485 [001] 99058.167954: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [002] 99058.167955: cobalt_core:cobalt_schedule: status=0x10000000 > kernel-drv-task10 24070 [003] 99058.167955: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task3 56485 [001] 99058.167956: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task1 56487 [001] 99058.167960: cobalt_core:cobalt_schedule: status=0x10000000 >  rt-task4 56486 [001] 99058.167962: cobalt_core:cobalt_schedule: status=0x10000000 > kernel-drv-task11 24077 [002] 99058.167968: cobalt_core:cobalt_schedule: status=0x10000000 > kernel-drv-task14 24083 [003] 99058.167976: cobalt_core:cobalt_schedule: status=0x10000000 > kernel-drv-task14 24083 [003] 99058.167977: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [002] 99058.167977: cobalt_core:cobalt_schedule: status=0x10000000 > kernel-drv-task12 24088 [003] 99058.167989: cobalt_core:cobalt_schedule: status=0x10000000 > kernel-drv-task11 24077 [002] 99058.167990: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [002] 99058.167993: cobalt_core:cobalt_schedule: status=0x10000000 > kernel-drv-task10 24070 [003] 99058.167996: cobalt_core:cobalt_schedule: status=0x10000000 >   swapper 0 [001] 99058.167997: cobalt_core:cobalt_schedule: status=0x10000000 > kernel-drv-task14 24083 [003] 99058.168000: cobalt_core:cobalt_schedule: status=0x10000000 > For a deeper analysis, it would be good to trace all cobalt* and all irq* events. Those may tell us if we are not getting irqs at all or if something is blocking their processing. Jan -- Siemens AG, Foundational Technologies Linux Expert Center