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2026-08-09 - 12:48

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, 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 rack5slot3s.osadl.org (updated Sun Aug 09, 2026 00:44:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
152332238164,23sleep10-21swapper/119:05:471
155142236163,24sleep20-21swapper/219:09:272
155302203166,24sleep30-21swapper/319:09:403
133962202165,25sleep00-21swapper/019:05:020
1982721390,5sleep01564599cyclictest19:15:220
2513921330,4sleep01564599cyclictest21:55:180
15657998682,3cyclictest0-21swapper/223:21:512
15657998682,3cyclictest0-21swapper/223:21:512
15657997875,2cyclictest0-21swapper/222:48:562
15657997167,3cyclictest0-21swapper/200:03:302
99612570,4sleep081ktimersoftd/022:35:150
309092540,5sleep11565099cyclictest19:40:221
293702540,3sleep31566199cyclictest20:50:233
102142530,1sleep00-21swapper/020:08:390
258612520,4sleep339-21rcuc/300:25:143
258612520,4sleep339-21rcuc/300:25:143
97332490,3sleep30-21swapper/320:05:253
1565099462,32cyclictest3435-21munin-run23:35:011
1566199421,29cyclictest0-21swapper/320:57:053
1565099427,24cyclictest7836-21awk23:45:011
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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