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2026-08-09 - 12:05

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 Sun Aug 09, 2026 00:44:47)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
144349821190,2sleep10-21swapper/120:35:191
141102821160,14sleep1261ksoftirqd/119:05:191
144659321090,4sleep23056-21PK-Backend20:45:152
14107152730,8sleep30-21swapper/319:05:133
141192827250,14sleep20-21swapper/219:10:012
141158126747,14sleep00-21swapper/019:05:320
14521172580,4sleep0161rcuc/021:00:170
15205822480,2sleep00-21swapper/000:15:210
14488302470,4sleep03056-21PK-Backend20:50:220
14740722460,14sleep013-21ksoftirqd/022:05:000
14264962460,2sleep00-21swapper/019:48:350
14151072450,3sleep342-21ksoftirqd/319:15:173
14242202370,3sleep01424221-21ps19:40:200
14237832330,2sleep10-21swapper/119:40:141
14902012270,4sleep33056-21PK-Backend22:50:153
1412061992618,2cyclictest0-21swapper/021:25:150
139099260,4rtkit-daemon1389-21rtkit-daemon22:08:222
14867232250,4sleep10-21swapper/122:40:151
139099250,4rtkit-daemon1389-21rtkit-daemon23:46:593
139099250,4rtkit-daemon1389-21rtkit-daemon00:05:022
139099240,4rtkit-daemon1389-21rtkit-daemon23:30:323
139099240,3rtkit-daemon0-21swapper/019:29:010
14286112230,4sleep33056-21PK-Backend19:55:113
14286112230,4sleep33056-21PK-Backend19:55:113
141207199230,1cyclictest3056-21PK-Backend23:27:163
1412067992318,4cyclictest1514249-21latency_hist00:00:002
1412061992314,7cyclictest883-21dbus-daemon19:15:000
141206199230,21cyclictest1506431-21sh23:35:200
139099230,3rtkit-daemon1389-21rtkit-daemon21:31:422
1412071992218,3cyclictest1447712-21munin-run20:50:003
141207199220,20cyclictest3056-21PK-Backend22:07:123
1412067992220,1cyclictest0-21swapper/222:42:412
1412067992220,1cyclictest0-21swapper/221:07:162
1412067992220,1cyclictest0-21swapper/220:14:032
1412067992220,1cyclictest0-21swapper/219:49:092
141206799220,21cyclictest0-21swapper/223:03:372
1412064992220,1cyclictest0-21swapper/121:48:521
1412064992220,1cyclictest0-21swapper/120:08:271
1412064992220,1cyclictest0-21swapper/119:46:301
1412064992216,4cyclictest1482597-21cron22:30:001
141206499220,21cyclictest0-21swapper/122:38:541
141206199220,21cyclictest1413400-21chrt19:10:570
141206199220,1cyclictest0-21swapper/021:40:500
139099220,4rtkit-daemon1389-21rtkit-daemon21:42:252
139099220,4rtkit-daemon1389-21rtkit-daemon20:36:322
139099220,15rtkit-daemon3056-21PK-Backend22:44:173
139099220,15rtkit-daemon0-21swapper/323:05:373
15221322210,4sleep33056-21PK-Backend00:20:133
14589362210,3sleep00-21swapper/021:20:130
1412071992119,1cyclictest3056-21PK-Backend23:57:103
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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