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2025-08-21 - 21:27

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 50 highest latencies:
System rack3slot3s.osadl.org (updated Thu Aug 21, 2025 12:43:56)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
65564821990,2sleep2655650-21grep11:30:142
75353021700,3sleep2411rcuc/212:29:502
3283392167142,18sleep00-21swapper/007:08:120
3283592150105,15sleep20-21swapper/207:08:252
3283782146102,15sleep10-21swapper/107:08:411
328312214599,37sleep30-21swapper/307:07:503
75800721410,2sleep00-21swapper/012:30:200
328610994231,9cyclictest340494-21munin-run07:19:593
328610993828,7cyclictest666925-21uname11:35:173
328610993525,7cyclictest749517-21uname12:25:203
328610993322,9cyclictest569666-21kthreadcore10:30:183
328610993317,14cyclictest0-21swapper/312:15:223
328610993221,9cyclictest0-21swapper/312:10:123
328610993120,9cyclictest686268-21cron11:49:593
328610993117,2cyclictest0-21swapper/310:55:263
328610993116,3cyclictest545801-21fschecks_count10:15:133
328610993112,8cyclictest914-21ntpd09:10:233
328610993111,8cyclictest0-21swapper/311:21:433
328610993016,2cyclictest0-21swapper/310:05:003
328610993013,5cyclictest445102-21cut09:00:223
32861099300,17cyclictest350556-21latency_hist07:30:003
328610992913,4cyclictest625922-21gltestperf11:10:143
328610992910,8cyclictest0-21swapper/311:05:123
32861099283,16cyclictest486446-21sh09:33:363
328610992823,3cyclictest0-21swapper/311:40:133
328610992819,6cyclictest518969-21cut09:55:163
32861099281,4cyclictest262-21systemd-journal08:40:013
328610992814,3cyclictest0-21swapper/309:50:003
328610992811,6cyclictest450948-21latency_hist09:10:013
32861099279,7cyclictest736-21gdbus08:30:003
328610992722,3cyclictest712334-21gltestperf12:05:113
328610992722,3cyclictest712334-21gltestperf12:05:113
32861099271,4cyclictest0-21swapper/311:30:123
328610992711,6cyclictest495331-21ssh09:40:143
32861099271,15cyclictest603374-21basename10:55:003
328610992710,7cyclictest262-21systemd-journal10:28:463
32861099270,18cyclictest710406-21sh12:03:213
328610992622,2cyclictest0-21swapper/307:38:023
328610992620,4cyclictest355414-21turbostat.cron07:35:003
328610992613,10cyclictest595090-21runrttasks10:47:033
32861099260,18cyclictest579531-21sh10:36:073
328610992521,2cyclictest0-21swapper/308:00:283
328610992517,5cyclictest699399-21mailstats11:55:223
328610992511,5cyclictest638576-21ssh11:17:183
328610992412,8cyclictest755749-21tr12:30:173
328610992319,2cyclictest654882-21cron11:30:003
328610992316,5cyclictest691183-21grep11:50:273
328610992313,2cyclictest0-21swapper/310:20:153
328610992312,7cyclictest542662-21mailstats10:10:263
328610992312,4cyclictest511ktimers/310:05:043
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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