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2025-12-11 - 12:42

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, slot #7

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 rackcslot7s.osadl.org (updated Thu Dec 11, 2025 00:44:56)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1623991430,10rtkit-daemon1622-21rtkit-daemon19:35:353
162399960,9rtkit-daemon1622-21rtkit-daemon20:31:382
3419532950,6sleep21358-1kworker/u9:120:45:202
307214999222,53cyclictest407659-21/usr/sbin/munin23:50:010
30721499882,21cyclictest1753-21gnome-shell23:42:030
30721499862,20cyclictest1753-21gnome-shell23:39:590
30701428569,10sleep10-21swapper/119:09:171
307218998313,17cyclictest26-21ksoftirqd/123:48:021
30722099827,13cyclictest1753-21gnome-shell23:56:292
307218998210,19cyclictest26-21ksoftirqd/100:11:591
307218998114,17cyclictest26-21ksoftirqd/123:39:591
307220997969,6cyclictest0-21swapper/223:52:232
307220997969,6cyclictest0-21swapper/223:52:232
162399790,5rtkit-daemon0-21swapper/100:21:031
30722499785,13cyclictest42-21ksoftirqd/300:03:473
162399780,5rtkit-daemon0-21swapper/123:09:451
162399780,5rtkit-daemon0-21swapper/123:09:441
30721499762,48cyclictest1753-21gnome-shell00:11:340
162399760,8rtkit-daemon1622-21rtkit-daemon19:15:412
162399760,5rtkit-daemon0-21swapper/123:14:251
30721499743,12cyclictest1753-21gnome-shell23:59:460
30721499736,12cyclictest141rcu_preempt00:08:200
30680627354,13sleep30-21swapper/319:06:323
162399730,5rtkit-daemon0-21swapper/123:20:561
30722499726,48cyclictest42-21ksoftirqd/323:50:203
30722499726,48cyclictest42-21ksoftirqd/323:50:193
307224997250,16cyclictest42-21ksoftirqd/323:57:423
30722499723,64cyclictest1753-21gnome-shell23:45:153
30721499722,46cyclictest408965-21timerwakeupswit23:50:330
30721499722,46cyclictest408965-21timerwakeupswit23:50:330
30687727240,26sleep20-21swapper/219:07:292
162399720,5rtkit-daemon0-21swapper/123:02:031
162399720,5rtkit-daemon0-21swapper/120:40:431
30721499702,10cyclictest1069-21runrttasks00:00:150
162399700,5rtkit-daemon0-21swapper/121:10:341
307214996826,38cyclictest362730-21pool-org.gnome.21:44:500
307224996736,10cyclictest1753-21gnome-shell00:06:093
307220996743,18cyclictest413923-21ntpq00:05:302
30722099668,16cyclictest34-21ksoftirqd/200:00:252
30685326638,22sleep00-21swapper/019:07:110
307224996556,5cyclictest42-21ksoftirqd/323:45:013
30722099652,19cyclictest1753-21gnome-shell23:43:142
307224996417,43cyclictest42-21ksoftirqd/323:39:563
30721899642,19cyclictest1753-21gnome-shell23:40:271
162399640,4rtkit-daemon0-21swapper/322:34:523
307224996322,5cyclictest42-21ksoftirqd/300:10:163
30721899632,57cyclictest1753-21gnome-shell23:57:281
30721899632,51cyclictest408387-21irqstats23:50:241
30721899632,51cyclictest408387-21irqstats23:50:241
30722099622,19cyclictest1753-21gnome-shell00:10:562
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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