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2026-09-20 - 20:50

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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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 Sep 20, 2026 12:44:43)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
32861121290,3sleep10-21swapper/111:20:151
139099960,76rtkit-daemon0-21swapper/007:05:150
23958427639,14sleep30-21swapper/307:07:433
23828627447,17sleep20-21swapper/207:05:092
23906826643,15sleep10-21swapper/107:05:281
3110412550,4sleep00-21swapper/010:30:140
2942682480,1sleep30-21swapper/309:40:243
3336842450,2sleep1333277-21/usr/sbin/munin11:35:151
3279542450,2sleep33056-21PK-Backend11:20:013
2703522430,2sleep00-21swapper/008:35:130
3335802410,4sleep33056-21PK-Backend11:35:133
3370832350,3sleep10-21swapper/111:45:131
239897993319,12cyclictest287740-21unin-run09:25:010
239899992614,8cyclictest1095-21runrttasks11:15:111
23989999251,22cyclictest255723-21runrttasks07:51:421
23989799250,9cyclictest3512942grep12:25:130
3297822240,4chrt0-21swapper/211:25:002
23990799241,9cyclictest322645-21perf11:05:003
2580032230,5sleep00-21swapper/008:00:120
239907992316,5cyclictest292915-21awk09:40:013
239902992319,3cyclictest324863-21expr11:10:142
239897992314,7cyclictest356106-21perf12:39:590
23989799230,21cyclictest296367-21apt-get09:49:590
139099230,16rtkit-daemon3056-21PK-Backend09:48:401
139099230,16rtkit-daemon0-21swapper/109:55:091
139099230,14rtkit-daemon0-21swapper/107:25:171
2884542220,4chrt0-21swapper/109:25:191
2710852220,3sleep10-21swapper/108:35:221
23990799220,1cyclictest3056-21PK-Backend11:10:133
23990299221,2cyclictest0-21swapper/207:40:122
239899992220,1cyclictest3056-21PK-Backend09:42:141
239899992220,1cyclictest0-21swapper/110:22:571
239899992220,1cyclictest0-21swapper/109:14:571
239899992220,1cyclictest0-21swapper/109:07:461
239899992219,2cyclictest3056-21PK-Backend07:21:411
239899992214,6cyclictest332271-21ntp_kernel_err11:30:181
239899992210,10cyclictest284882-21diskstats09:15:141
23989999220,21cyclictest0-21swapper/112:18:491
239897992220,1cyclictest0-21swapper/012:31:490
239897992220,1cyclictest0-21swapper/012:04:110
239897992220,1cyclictest0-21swapper/009:00:390
239897992220,1cyclictest0-21swapper/008:50:110
239897992220,1cyclictest0-21swapper/008:33:350
239897992220,1cyclictest0-21swapper/007:28:250
239897992211,9cyclictest266423-21unin-run08:25:010
23989799220,1cyclictest0-21swapper/011:59:110
139099220,14rtkit-daemon0-21swapper/108:52:531
239907992119,1cyclictest3056-21PK-Backend07:58:173
239907992118,2cyclictest3056-21PK-Backend12:25:443
23990799211,2cyclictest287953-21/usr/sbin/munin09:25:163
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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