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2025-11-07 - 00:49

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #1, slot #6

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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  Intel
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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
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rack1slot6s.osadl.org (updated Thu Nov 06, 2025 12:43:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
8071991053,55cyclictest0-21swapper/007:32:060
8075998031,42cyclictest3196-21munin-run06:41:343
8075998031,42cyclictest3196-21munin-run06:41:343
8075997929,32cyclictest25895-21runrttasks06:21:353
8075997927,33cyclictest0-21swapper/306:36:343
8075997833,37cyclictest28893-21df08:41:453
8075997831,39cyclictest0-21swapper/309:48:583
8075997829,39cyclictest8295-21munin-node04:37:163
8075997735,35cyclictest1160-21snmpd06:09:433
8075997734,36cyclictest19594-21unixbench_singl04:57:113
8075997537,30cyclictest24503-21tail08:31:503
8075997532,26cyclictest26735-21runrttasks09:43:053
8075997526,41cyclictest0-21swapper/305:05:043
8075997433,12cyclictest4671-21aten_r1power_cu05:36:493
8075997432,28cyclictest21926-21vmstat07:17:063
8075997425,42cyclictest4304-21gltestperf06:41:543
8075997330,36cyclictest5546-21if_err_eth007:51:533
8075997329,37cyclictest0-21swapper/309:06:303
8075997329,36cyclictest15281-21munin-node09:21:503
8075997323,31cyclictest0-21swapper/304:41:523
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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