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2026-04-14 - 15:12

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 Tue Apr 14, 2026 12:44:45)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
26670632990,2sleep20-21swapper/209:40:232
139099960,58rtkit-daemon0-21swapper/307:06:503
261096828148,22sleep10-21swapper/107:05:121
261157326544,14sleep20-21swapper/207:05:202
261228626343,13sleep00-21swapper/007:08:040
26324222490,4sleep20-21swapper/208:05:122
26719892380,4sleep33056-21PK-Backend09:55:163
26895182360,2sleep03056-21PK-Backend10:45:130
26418342270,9sleep126-21ksoftirqd/108:30:201
2612566992614,10cyclictest2663848-21cron09:35:000
261257099254,8cyclictest2699350-21perf-exec11:14:591
2612570992512,3cyclictest2175-21JS10:27:481
139099250,4rtkit-daemon1389-21rtkit-daemon11:36:400
2612574992417,5cyclictest883-21dbus-daemon09:38:032
261257099244,7cyclictest2665608-21idleruntime-cro09:40:001
26220022230,2sleep33056-21PK-Backend07:35:143
2612574992321,1cyclictest0-21swapper/208:48:312
261257499230,3cyclictest2657558-21df_inode09:15:132
2612570992315,6cyclictest2676493-21cron10:10:001
139099230,15rtkit-daemon0-21swapper/207:30:422
2612577992213,7cyclictest2690652-21cron10:50:013
2612577992211,9cyclictest42-21ksoftirqd/312:35:003
2612574992220,1cyclictest0-21swapper/211:08:362
2612574992220,1cyclictest0-21swapper/211:03:292
2612574992220,1cyclictest0-21swapper/209:33:332
2612574992220,1cyclictest0-21swapper/208:04:302
2612574992220,1cyclictest0-21swapper/207:28:472
261257499220,20cyclictest0-21swapper/211:11:412
261257099222,7cyclictest26-21ksoftirqd/107:20:101
2612570992220,1cyclictest0-21swapper/112:10:521
2612570992220,1cyclictest0-21swapper/109:08:361
2612570992220,1cyclictest0-21swapper/108:03:251
2612570992220,1cyclictest0-21swapper/107:11:421
2612570992220,1cyclictest0-21swapper/107:11:411
2612570992219,2cyclictest3056-21PK-Backend11:45:031
2612570992219,2cyclictest0-21swapper/112:31:351
2612566992220,1cyclictest0-21swapper/012:38:040
2612566992220,1cyclictest0-21swapper/010:00:340
2612566992220,1cyclictest0-21swapper/008:58:570
2612566992220,1cyclictest0-21swapper/008:00:500
2612566992218,2cyclictest2624765-21sed07:40:210
261256699220,20cyclictest2682879-21expr10:25:210
261257799216,13cyclictest2663889-21systemd-run09:35:013
2612577992117,2cyclictest42-21ksoftirqd/308:44:593
2612574992119,1cyclictest0-21swapper/211:43:452
2612574992119,1cyclictest0-21swapper/211:30:532
2612574992119,1cyclictest0-21swapper/210:50:252
2612574992119,1cyclictest0-21swapper/209:20:272
2612574992119,1cyclictest0-21swapper/209:11:022
2612574992119,1cyclictest0-21swapper/208:28:572
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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