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2026-04-21 - 07:37

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 Apr 21, 2026 00:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
216832970,3sleep00-21swapper/023:37:150
216832970,3sleep00-21swapper/023:37:150
273852820,2sleep30-21swapper/319:32:163
148832820,3sleep30-21swapper/323:17:243
148832820,3sleep30-21swapper/323:17:243
148832820,3sleep30-21swapper/323:17:243
181522790,3sleep10-21swapper/120:32:281
181522790,3sleep10-21swapper/120:32:281
53632720,3chrt0-21swapper/322:52:203
53632720,3chrt0-21swapper/322:52:203
296242720,2sleep10-21swapper/123:57:181
296242720,2sleep10-21swapper/123:57:181
296242720,2sleep10-21swapper/123:57:181
169982710,4sleep30-21swapper/320:32:103
234012690,3sleep30-21swapper/320:47:223
234012690,3sleep30-21swapper/320:47:223
68432680,3sleep30-21swapper/300:22:253
68432680,3sleep30-21swapper/300:22:253
224952680,2chrt22499-21switchtime23:37:241
224952680,2chrt22499-21switchtime23:37:241
98622670,3sleep30-21swapper/320:12:163
132992660,2sleep30-21swapper/323:12:263
132992660,2sleep30-21swapper/323:12:263
86502640,2chrt0-21swapper/000:27:240
86502640,2chrt0-21swapper/000:27:240
112802560,3sleep20-21swapper/220:17:062
173212550,3chrt0-21swapper/321:57:243
173212550,3chrt0-21swapper/321:57:243
173212550,3chrt0-21swapper/321:57:243
306722530,3chrt0-21swapper/322:32:263
306722530,3chrt0-21swapper/322:32:263
19667995220,27cyclictest27185-21kworker/u9:2+rpciod00:02:070
19667995220,27cyclictest27185-21kworker/u9:2+rpciod00:02:070
19667995220,27cyclictest27185-21kworker/u9:2+rpciod00:02:070
1966799470,7cyclictest19995-21taskset22:07:020
1966799470,7cyclictest19995-21taskset22:07:020
89982460,2sleep20-21swapper/221:37:132
1966799451,8cyclictest971-21taskset21:12:590
1966799451,8cyclictest971-21taskset21:12:590
5292440,3chrt0-21swapper/200:07:162
5292440,3chrt0-21swapper/200:07:162
5292440,3chrt0-21swapper/200:07:162
1966799441,7cyclictest9061-21seq20:08:150
1966799441,7cyclictest9061-21seq20:08:150
1966799431,7cyclictest4238-21runrttasks22:48:550
1966799431,7cyclictest4238-21runrttasks22:48:550
37982420,3sleep30-21swapper/319:57:053
19667994220,20cyclictest28641-21gltestperf21:02:160
19667994220,20cyclictest28641-21gltestperf21:02:160
19667994220,20cyclictest28641-21gltestperf21:02:160
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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