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2026-06-07 - 05:44

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 Sat Jun 06, 2026 00:44:47)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
296401621180,18sleep2331rcuc/219:05:212
305237221150,4sleep20-21swapper/223:15:152
299849821080,2sleep03056-21PK-Backend20:40:200
30402072950,2sleep234-21ksoftirqd/222:40:142
139099790,69rtkit-daemon0-21swapper/319:09:323
296458627537,13sleep10-21swapper/119:06:501
296433427143,19sleep00-21swapper/019:05:280
30805402480,2sleep33056-21PK-Backend00:35:123
30687392430,5sleep30-21swapper/300:00:193
30162712370,2sleep13056-21PK-Backend21:30:211
30067502270,4sleep23006752-21cpuspeed_turbos21:05:122
30067502270,4sleep23006752-21cpuspeed_turbos21:05:112
139099260,4rtkit-daemon1389-21rtkit-daemon21:37:353
296496499250,23cyclictest2989037-21chrt20:15:122
139099250,4rtkit-daemon1389-21rtkit-daemon22:39:090
139099250,16rtkit-daemon3078501-21apt00:30:112
139099240,17rtkit-daemon0-21swapper/200:37:422
139099240,16rtkit-daemon3056-21PK-Backend21:00:571
139099240,15rtkit-daemon0-21swapper/222:35:232
2964964992315,7cyclictest2019-21gmain20:55:012
139099230,4rtkit-daemon1389-21rtkit-daemon23:35:520
139099230,4rtkit-daemon1389-21rtkit-daemon20:46:050
139099230,19rtkit-daemon1020-21ntpd20:07:042
139099230,18rtkit-daemon1020-21ntpd21:13:502
139099230,18rtkit-daemon1020-21ntpd21:13:502
139099230,16rtkit-daemon3056-21PK-Backend21:57:001
139099230,16rtkit-daemon3056-21PK-Backend21:40:521
139099230,16rtkit-daemon3056-21PK-Backend21:38:151
30300162220,3chrt0-21swapper/222:10:162
30300162220,3chrt0-21swapper/222:10:162
2964968992219,2cyclictest3056-21PK-Backend22:12:503
2964968992219,2cyclictest3056-21PK-Backend22:12:493
296496899220,20cyclictest3033811-21switchtime22:20:213
2964960992220,1cyclictest0-21swapper/100:34:231
2964960992219,2cyclictest3056-21PK-Backend19:47:081
2964960992219,2cyclictest3056-21PK-Backend00:29:301
2964960992219,2cyclictest3056-21PK-Backend00:13:421
2964960992218,3cyclictest0-21swapper/122:50:191
139099220,4rtkit-daemon1389-21rtkit-daemon22:58:320
139099220,4rtkit-daemon1389-21rtkit-daemon22:23:160
139099220,16rtkit-daemon3056-21PK-Backend22:29:303
139099220,16rtkit-daemon3056-21PK-Backend20:22:041
139099220,15rtkit-daemon0-21swapper/120:25:241
296496899219,4cyclictest42-21ksoftirqd/320:17:283
296496899217,8cyclictest42-21ksoftirqd/322:35:133
2964968992119,1cyclictest3056-21PK-Backend23:21:323
2964968992119,1cyclictest3056-21PK-Backend22:34:343
2964968992119,1cyclictest0-21swapper/323:50:043
2964968992119,1cyclictest0-21swapper/322:59:213
2964968992119,1cyclictest0-21swapper/321:52:213
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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