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2025-07-12 - 11:02

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, slot #3

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 20 highest latencies:
System rack3slot3s.osadl.org (updated Sat Jul 12, 2025 00:43:55)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
51802214398,36sleep10-21swapper/119:08:541
51663214198,34sleep30-21swapper/319:07:083
516152135106,21sleep00-21swapper/019:06:320
517682132109,15sleep20-21swapper/219:08:272
52012994425,17cyclictest471585-21awk00:15:013
52012993725,8cyclictest243688-21grep21:50:293
5201299362,23cyclictest318066-21ssh22:37:503
52012993228,3cyclictest703-21dbus-daemon00:20:003
52012992924,3cyclictest279878-21cpuspeed_turbos22:15:153
52012992823,3cyclictest231717-21kthreadcore21:45:163
52012992722,3cyclictest494341-21fschecks_time00:30:153
52012992622,2cyclictest83916-21sh19:39:593
52012992622,2cyclictest295489-21perf22:25:013
52012992622,2cyclictest0-21swapper/320:40:163
52012992515,8cyclictest0-21swapper/323:10:253
52012992420,2cyclictest104855-21gltestperf20:00:153
52012992411,9cyclictest305712-21cut22:30:173
52012992411,9cyclictest259312-21ntpq22:00:223
52012992320,2cyclictest129611-21turbostat.cron20:25:013
52012992319,2cyclictest943-21runrttasks23:26:193
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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