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2026-10-21 - 00:50

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #5

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 rackeslot5s.osadl.org (updated Tue Oct 20, 2026 12:44:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
512699270,26cyclictest0-21swapper/210:20:042
5124992726,1cyclictest62550irq/127-eno109:17:580
5127992623,2cyclictest14852-21runrttasks09:23:113
5126992621,5cyclictest31303-21diskmemload11:40:182
5126992620,5cyclictest0-21swapper/209:45:172
512699260,21cyclictest24851-21sed10:00:272
5124992625,1cyclictest13-21ksoftirqd/012:15:520
5127992524,1cyclictest34-21ksoftirqd/311:49:383
512799250,24cyclictest31303-21diskmemload12:32:453
512799250,24cyclictest31303-21diskmemload10:53:263
512799250,24cyclictest31303-21diskmemload09:57:213
512799250,1cyclictest331rcuc/311:53:013
5126992523,2cyclictest0-21swapper/211:37:102
5126992523,1cyclictest6847-21sed09:15:262
5126992523,1cyclictest0-21swapper/210:49:072
5126992522,3cyclictest0-21swapper/210:38:422
5126992520,0cyclictest0-21swapper/212:25:012
512699250,24cyclictest0-21swapper/209:43:312
512699250,21cyclictest31303-21diskmemload11:26:502
512699250,21cyclictest14086-21apt-get10:50:172
512499250,24cyclictest31303-21diskmemload10:05:350
512499250,24cyclictest27533-21apt-get12:00:180
512499250,0cyclictest131ksoftirqd/010:28:200
5127992422,1cyclictest34-21ksoftirqd/307:50:003
5127992422,0cyclictest34-21ksoftirqd/311:01:023
5127992422,0cyclictest34-21ksoftirqd/309:18:533
512799240,24cyclictest0-21swapper/312:00:183
512799240,23cyclictest31303-21diskmemload10:36:103
512799240,23cyclictest23540-21ssh11:26:273
512799240,23cyclictest0-21swapper/311:37:343
512799240,23cyclictest0-21swapper/310:58:293
512799240,0cyclictest31303-21diskmemload10:45:183
5126992422,1cyclictest0-21swapper/211:46:362
5126992421,3cyclictest0-21swapper/209:10:202
5126992420,0cyclictest0-21swapper/212:08:052
5126992420,0cyclictest0-21swapper/212:08:052
5126992419,1cyclictest1858-21apt-get10:10:162
512699240,23cyclictest0-21swapper/212:16:312
512699240,23cyclictest0-21swapper/209:55:022
512699240,23cyclictest0-21swapper/209:51:542
512699240,20cyclictest0-21swapper/211:52:412
512699240,1cyclictest0-21swapper/211:07:062
512699240,0cyclictest0-21swapper/211:22:272
5125992423,1cyclictest31303-21diskmemload11:50:111
512599240,24cyclictest0-21swapper/109:41:311
512599240,23cyclictest31658-21idleruntime-cro11:35:011
512599240,23cyclictest29936-21ssh12:01:121
512599240,23cyclictest0-21swapper/110:23:451
512599240,23cyclictest0-21swapper/109:23:401
512599240,0cyclictest0-21swapper/110:11:151
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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