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2026-05-06 - 00:42

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 Tue May 05, 2026 12:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3011321020,1chrt30115-21sed11:27:401
3011321020,1chrt30115-21sed11:27:401
3011321020,1chrt30115-21sed11:27:401
156602700,3chrt0-21swapper/107:42:361
156602700,3chrt0-21swapper/107:42:361
156602700,3chrt0-21swapper/107:42:361
229002670,2chrt22898-21users11:07:410
229002670,2chrt22898-21users11:07:410
159982560,2sleep20-21swapper/210:52:272
159982560,2sleep20-21swapper/210:52:272
211052550,2chrt0-21swapper/112:32:281
211052550,2chrt0-21swapper/112:32:281
297272460,3chrt0-21swapper/109:52:291
3428994426,15cyclictest12636-21gltestperf10:42:310
3428994426,15cyclictest12636-21gltestperf10:42:310
3428994425,17cyclictest3427-21cyclictest08:47:310
3428994425,17cyclictest3427-21cyclictest08:47:310
166662430,3sleep30-21swapper/312:17:383
166662430,3sleep30-21swapper/312:17:383
3428994219,21cyclictest30818-21irqstats09:57:320
3428994219,21cyclictest30818-21irqstats09:57:320
185062420,2sleep20-21swapper/209:17:322
185062420,2sleep20-21swapper/209:17:322
185062420,2sleep20-21swapper/209:17:322
185062420,2sleep20-21swapper/209:17:322
304422410,2sleep30-21swapper/309:57:303
304422410,2sleep30-21swapper/309:57:303
279512400,2sleep127989-21ntp_states11:22:341
279512400,2sleep127989-21ntp_states11:22:341
227452400,3sleep30-21swapper/312:37:163
5242390,3sleep30-21swapper/310:07:303
5242390,3sleep30-21swapper/310:07:303
5242390,3sleep30-21swapper/310:07:303
3429993930,7cyclictest1673-21netstat08:32:341
3429993930,7cyclictest1673-21netstat08:32:341
275102390,2sleep027511-21sshd08:16:490
275102390,2sleep027511-21sshd08:16:490
3428993827,8cyclictest1455-21kernelversion08:32:320
3428993827,8cyclictest1455-21kernelversion08:32:320
342899381,12cyclictest32687-21latency_hist10:07:210
342899381,12cyclictest32687-21latency_hist10:07:210
3428993729,6cyclictest17141-21sendmail12:22:170
3428993729,6cyclictest17141-21sendmail12:22:170
3428993717,17cyclictest0-21swapper/010:07:310
3428993717,17cyclictest0-21swapper/010:07:310
3428993717,17cyclictest0-21swapper/010:07:310
342899371,13cyclictest12004-21cron09:02:170
342899371,13cyclictest12004-21cron09:02:170
342899371,12cyclictest9755-21cat12:02:210
342899371,12cyclictest9755-21cat12:02:210
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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