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2026-04-03 - 22:21

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, slot #4

Rack #0/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #1/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #2/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #3/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #4/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #5/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #6/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #7/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #8/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #9/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #a/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #b/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #c/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #d/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #e/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #f/#0 #1 #2 #3 #4 #5 #6 #7 #8 
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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

Data to construct the above plot have been generated using the RT test utility cyclictest.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack0slot4s.osadl.org (updated Fri Apr 03, 2026 00:46:07)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
38453322406387,13sleep30-21swapper/319:06:359
38452512372352,13sleep70-21swapper/719:05:3513
38452362368360,5sleep00-21swapper/019:05:280
38455762361321,14sleep120-21swapper/1219:09:414
38452872361343,12sleep20-21swapper/219:06:028
38453122358347,7sleep80-21swapper/819:06:2414
38453922357316,14sleep40-21swapper/419:07:2410
38454092355336,13sleep130-21swapper/1319:07:345
38455082354335,12sleep110-21swapper/1119:08:523
38454582354312,14sleep50-21swapper/519:08:1511
38455122353333,13sleep150-21swapper/1519:08:567
38454382352332,13sleep60-21swapper/619:08:0012
38453592352333,12sleep100-21swapper/1019:06:582
38454432351331,13sleep90-21swapper/919:08:0215
38452862351332,12sleep10-21swapper/119:06:011
38452812351331,13sleep140-21swapper/1419:05:586
3846045999535,31cyclictest0-21swapper/020:10:010
384605699946,14cyclictest782-21systemd-journal20:10:0010
3846077999336,28cyclictest0-21swapper/1020:09:592
3846052997315,28cyclictest0-21swapper/320:10:009
3846075996361,0cyclictest0-21swapper/920:10:0015
3846071996362,1cyclictest3318-21Xorg20:10:0114
384609199624,28cyclictest0-21swapper/1420:09:596
384608699612,29cyclictest0-21swapper/1320:09:595
3846093995352,1cyclictest3318-21Xorg20:10:007
3846084995251,1cyclictest3318-21Xorg20:10:004
384606699484,44cyclictest0-21swapper/720:10:0013
384609199426,11cyclictest0-21swapper/1423:39:356
3846060994241,1cyclictest0-21swapper/519:10:2011
384609199402,25cyclictest0-21swapper/1419:16:006
3846081994039,1cyclictest3318-21Xorg20:10:003
3846061993938,1cyclictest3318-21Xorg20:09:5912
384609199380,24cyclictest0-21swapper/1419:48:566
3846060993824,14cyclictest0-21swapper/520:09:5911
3846050993837,1cyclictest3318-21Xorg20:09:598
3846091993434,0cyclictest0-21swapper/1400:30:276
3846075993434,0cyclictest0-21swapper/900:34:1315
3846052993434,0cyclictest0-21swapper/300:12:519
384609199339,0cyclictest0-21swapper/1421:16:496
3846091993333,0cyclictest0-21swapper/1420:23:146
3846091993333,0cyclictest0-21swapper/1419:54:346
3846091993333,0cyclictest0-21swapper/1419:14:566
3846091993331,1cyclictest3814645-21kworker/u32:0+events_unbound20:45:126
3846084993328,5cyclictest1774-21snmpd00:35:194
384607799330,30cyclictest0-21swapper/1023:33:582
384607799330,1cyclictest0-21swapper/1022:29:092
3846075993332,1cyclictest3986195-21kworker/u32:4+events_unbound21:40:1915
3846075993332,1cyclictest1769-21arpwatch00:36:1815
3846075993329,4cyclictest0-21swapper/920:17:4615
384607199330,29cyclictest0-21swapper/819:20:1314
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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