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2026-05-31 - 03:52

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, slot #3

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 rack0slot3s.osadl.org (updated Sun May 31, 2026 00:44:42)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
11606262262217,17sleep30-21swapper/319:06:263
11608622261215,17sleep60-21swapper/619:09:276
11606642256215,16sleep70-21swapper/719:06:547
11607882250225,17sleep10-21swapper/119:08:241
11607102250228,13sleep50-21swapper/519:07:335
11607542247222,16sleep00-21swapper/019:08:000
11605702245221,16sleep40-21swapper/419:05:554
11608582244218,17sleep20-21swapper/219:09:232
1161219993533,1cyclictest1491634-21kworker/2:0+events20:35:192
1161219993230,1cyclictest1491634-21kworker/2:0+events21:24:592
1161219992928,1cyclictest1491634-21kworker/2:0+events22:15:192
116122899270,25cyclictest0-21swapper/420:10:494
116121999274,22cyclictest2743-21gnome-shell19:53:592
116121099270,1cyclictest0-21swapper/019:30:590
116124099260,24cyclictest0-21swapper/700:20:577
116124099260,1cyclictest0-21swapper/722:11:087
116123299260,22cyclictest0-21swapper/522:12:145
116122899260,22cyclictest0-21swapper/423:18:374
116122899260,22cyclictest0-21swapper/422:58:194
116121999260,22cyclictest0-21swapper/219:10:152
116121099260,24cyclictest0-21swapper/019:15:140
116121099260,22cyclictest0-21swapper/000:37:480
1161240992521,3cyclictest1391-21snmpd00:32:067
1161240992518,5cyclictest0-21swapper/723:29:527
1161240992518,5cyclictest0-21swapper/723:29:527
1161240992518,5cyclictest0-21swapper/721:27:017
116124099251,23cyclictest0-21swapper/721:39:317
1161237992518,5cyclictest0-21swapper/620:38:266
1161237992518,3cyclictest0-21swapper/623:30:146
1161232992522,2cyclictest1391-21snmpd23:25:015
1161232992522,2cyclictest1391-21snmpd23:25:015
1161232992518,3cyclictest0-21swapper/519:46:125
1161228992518,5cyclictest0-21swapper/419:14:444
116122899250,1cyclictest0-21swapper/400:06:394
1161223992521,3cyclictest1226268-21cat21:05:153
116122399250,23cyclictest0-21swapper/323:54:023
116122399250,23cyclictest0-21swapper/300:26:513
1161219992524,1cyclictest401ktimers/222:10:162
1161219992521,3cyclictest1491634-21kworker/2:0+events23:45:212
1161219992521,3cyclictest1391-21snmpd21:47:232
1161219992521,3cyclictest1391-21snmpd20:20:382
1161219992521,3cyclictest1391-21snmpd20:11:222
1161219992521,3cyclictest1308619-21cat23:35:172
116121999250,23cyclictest0-21swapper/221:12:302
1161214992521,3cyclictest1391-21snmpd23:42:241
1161214992521,3cyclictest1391-21snmpd19:39:361
1161214992521,3cyclictest1391-21snmpd00:27:571
1161214992518,5cyclictest0-21swapper/123:25:161
1161214992518,5cyclictest0-21swapper/123:25:161
1161214992518,5cyclictest0-21swapper/123:01:131
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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