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2026-08-16 - 13:42

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 16, 2026 00:44:47)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
118001721310,3sleep20-21swapper/219:50:232
118613221030,2sleep20-21swapper/220:10:042
12792632990,3sleep30-21swapper/300:35:153
139099830,70rtkit-daemon0-21swapper/319:09:133
116375027536,33sleep20-21swapper/219:06:362
116253527443,20sleep10-21swapper/119:05:061
116253426242,12sleep00-21swapper/019:05:050
12686732550,3sleep33056-21PK-Backend00:05:153
11664902550,3sleep234-21ksoftirqd/219:15:032
12473332490,3sleep33056-21PK-Backend23:05:123
12671682390,3sleep11267174-21needreboot00:00:201
1164233992713,12cyclictest1262771-21unin-run23:50:000
12567602250,13sleep013-21ksoftirqd/023:30:200
12057552250,4chrt3056-21PK-Backend21:05:131
139099240,3rtkit-daemon1389-21rtkit-daemon20:41:250
139099240,3rtkit-daemon1389-21rtkit-daemon19:57:350
1164237992417,5cyclictest1168056-21cron19:17:001
116423399240,22cyclictest1788620-21WebKitWebProces21:13:260
139099230,15rtkit-daemon0-21swapper/021:54:570
11791152230,3sleep01179121-21cpuspeed_turbos19:50:130
1164233992315,5cyclictest1178703-21sh19:50:000
139099220,14rtkit-daemon3056-21PK-Backend22:48:220
12709642220,2sleep00-21swapper/000:10:220
11753472220,2sleep20-21swapper/219:40:012
1164237992216,5cyclictest1278647-21systemctl00:35:001
1164237992216,5cyclictest1278647-21systemctl00:35:001
116423799220,2cyclictest1788620-21WebKitWebProces19:13:201
116423799220,20cyclictest1389-21rtkit-daemon20:31:361
116423399222,17cyclictest1171757-21cron19:30:000
1164233992220,1cyclictest0-21swapper/023:05:470
1164233992220,1cyclictest0-21swapper/020:39:190
1164233992220,1cyclictest0-21swapper/020:18:100
1164233992214,3cyclictest13-21ksoftirqd/023:20:010
1164233992210,9cyclictest1192864-21unin-run20:30:000
1164233992210,9cyclictest1192864-21unin-run20:30:000
1164253992115,4cyclictest1224313-21idleruntime-cro22:00:003
1164253992113,6cyclictest436-20systemd-journal21:15:003
116425399210,20cyclictest3056-21PK-Backend22:59:333
116425399210,20cyclictest3056-21PK-Backend22:38:443
116425399210,20cyclictest3056-21PK-Backend21:34:093
116425399210,20cyclictest3056-21PK-Backend20:50:523
116425399210,20cyclictest3056-21PK-Backend19:11:403
116425399210,19cyclictest3056-21PK-Backend23:38:133
116425399210,19cyclictest3056-21PK-Backend20:46:443
116425399210,19cyclictest3056-21PK-Backend20:16:563
116425399210,19cyclictest3056-21PK-Backend19:25:463
1164247992119,1cyclictest0-21swapper/200:12:572
116424799210,20cyclictest0-21swapper/223:56:342
116424799210,20cyclictest0-21swapper/220:50:522
116424799210,20cyclictest0-21swapper/219:22:242
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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