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2025-11-14 - 14:38

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #1

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.

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 rack4slot1s.osadl.org (updated Fri Nov 14, 2025 12:44:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1161321380,3chrt0-21swapper/309:38:433
1161321380,3chrt0-21swapper/309:38:433
674121370,3chrt0-21swapper/210:48:532
674121370,3chrt0-21swapper/210:48:532
2767021220,3chrt0-21swapper/308:53:493
1971521100,3sleep20-21swapper/211:23:462
1971521100,3sleep20-21swapper/211:23:462
21079999791,3cyclictest0-21swapper/010:58:440
21079999791,3cyclictest0-21swapper/010:58:440
139382930,2sleep013941-21gltestperf08:18:440
195292900,2sleep30-21swapper/308:33:433
136002900,3sleep30-21swapper/308:18:393
96372840,3chrt0-21swapper/309:33:403
96372840,3chrt0-21swapper/309:33:403
157002670,2sleep00-21swapper/012:38:500
157002670,2sleep00-21swapper/012:38:500
180402660,2chrt18039-21latency08:28:501
2108099653,9cyclictest181rcu_preempt12:03:421
2108099653,9cyclictest181rcu_preempt12:03:421
81442610,2sleep10-21swapper/112:18:491
81442610,2sleep10-21swapper/112:18:491
2108099606,5cyclictest181rcu_preempt12:13:411
2108099606,5cyclictest181rcu_preempt12:13:411
233662590,3chrt23368-21fschecks_count08:43:450
2107999561,2cyclictest0-21swapper/008:08:410
2107999561,2cyclictest0-21swapper/008:08:410
2107999561,2cyclictest0-21swapper/007:33:400
2107999561,2cyclictest0-21swapper/007:33:400
324812550,3sleep30-21swapper/309:08:323
324812550,3sleep30-21swapper/309:08:323
2107999551,2cyclictest0-21swapper/009:28:410
2107999551,2cyclictest0-21swapper/009:28:410
312082530,3sleep20-21swapper/211:53:492
2107999520,5cyclictest30490-21apt-get11:53:400
2108099511,10cyclictest0-21swapper/109:08:391
2108099511,10cyclictest0-21swapper/109:08:391
2107999512,41cyclictest0-21swapper/011:03:430
2107999512,41cyclictest0-21swapper/011:03:430
21079995118,21cyclictest171ktimers/009:43:410
21079995118,21cyclictest171ktimers/009:43:410
2107999508,25cyclictest0-21swapper/008:55:050
2107999502,5cyclictest32618-21apt-get09:08:390
2107999502,5cyclictest32618-21apt-get09:08:390
2107999502,45cyclictest0-21swapper/007:58:400
2107999501,7cyclictest12981-21seq09:41:250
2107999501,7cyclictest12981-21seq09:41:250
2107999501,11cyclictest29913-21chrt11:49:210
2107999501,11cyclictest29913-21chrt11:49:210
2107999501,10cyclictest26183-21runrttasks11:40:000
2107999501,10cyclictest26183-21runrttasks11:40:000
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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