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2026-09-08 - 18:35

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #3

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 rack5slot3s.osadl.org (updated Tue Sep 08, 2026 12:44:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
316002238161,25sleep00-21swapper/007:05:090
9772221192,19sleep10-21swapper/107:07:281
9992208132,25sleep20-21swapper/207:07:452
9322203167,23sleep30-21swapper/307:06:543
1274998576,8cyclictest0-21swapper/212:05:052
1274998178,2cyclictest0-21swapper/211:10:492
1274998178,2cyclictest0-21swapper/210:29:582
24252610,4sleep121-21rcuc/109:35:241
101222450,3sleep310124-21cpuspeed_turbos09:55:133
1262993511,11cyclictest26763-21idleruntime-cro09:20:020
218232330,4sleep011-21rcuc/009:05:250
126299326,12cyclictest7-21ksoftirqd/009:35:010
1267993110,18cyclictest6498-21expr11:00:151
1267993110,18cyclictest6498-21expr11:00:141
126299302,21cyclictest31081-21kworker/0:111:55:570
126299301,10cyclictest32664-21kworker/0:108:22:070
1274992825,2cyclictest0-21swapper/208:31:372
126299280,13cyclictest24565-21awk09:15:010
126799277,12cyclictest12050irq/123-ahci[0010:51:201
126799263,17cyclictest0-21swapper/112:34:511
126299262,16cyclictest8702-21kworker/0:212:24:570
127899251,11cyclictest31528-21sshd10:42:163
127899251,11cyclictest28717-21sshd09:22:153
1267992515,3cyclictest329-21kernelversion10:45:171
126799251,16cyclictest16922-21cstates10:10:171
126299257,15cyclictest6345-21munin-run07:20:010
126299256,16cyclictest4433-21munin-run12:10:010
126299251,12cyclictest5383-21munin-run09:45:010
127899247,3cyclictest39-21rcuc/311:01:253
127899247,3cyclictest39-21rcuc/311:01:253
127899241,16cyclictest0-21swapper/310:09:593
127899241,16cyclictest0-21swapper/308:50:253
127899241,11cyclictest21453-21ntp_states09:05:223
127899241,11cyclictest1273-21sshd10:46:163
1267992414,3cyclictest25156-21timerandwakeup11:40:251
126799241,16cyclictest19769-21entropy11:30:141
126799241,16cyclictest0-21swapper/111:28:071
126799241,16cyclictest0-21swapper/107:20:271
126299242,7cyclictest23392-21kworker/0:012:15:250
126299242,7cyclictest23392-21kworker/0:011:52:170
127899231,7cyclictest23582-21latency_hist11:40:023
127499236,9cyclictest32-21ksoftirqd/209:21:302
127499231,9cyclictest244272grep11:40:162
126799236,4cyclictest0-21swapper/110:06:261
126799231,19cyclictest13497-21df07:35:121
126299232,7cyclictest5667-21kworker/0:011:07:250
126299231,7cyclictest28702-21kworker/0:109:25:190
127899221,6cyclictest0-21swapper/310:30:333
127899221,6cyclictest0-21swapper/309:29:343
127899221,4cyclictest0-21swapper/312:02:073
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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