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2026-01-10 - 21:10

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 Sat Jan 10, 2026 12:43:55)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2662423212658,63sleep30-21swapper/307:05:113
266701928367,10sleep20-21swapper/207:05:502
266705028056,6sleep00-21swapper/007:06:110
266725827862,10sleep10-21swapper/107:08:541
27599472410,10sleep1331ktimers/108:35:141
2667471992720,3cyclictest2974699-21turbostat12:00:003
28158352251,11sleep22815880-21open_files09:25:212
28801702241,11sleep22880346-21grep10:30:152
2667471992421,1cyclictest0-21swapper/309:25:243
266747199219,8cyclictest2716921-21sleep07:55:003
2667471992118,1cyclictest0-21swapper/310:30:273
27803352201,1sleep00-21swapper/008:55:090
266747199202,12cyclictest2964501-21taskset11:50:103
266747199202,11cyclictest2720197-21taskset07:55:153
2667471992018,1cyclictest0-21swapper/307:35:123
2667471991915,2cyclictest0-21swapper/311:20:243
2667471991915,2cyclictest0-21swapper/309:45:123
2667471991915,2cyclictest0-21swapper/307:15:003
266747199191,4cyclictest2948455-21sleep11:35:003
266747199191,15cyclictest0-21swapper/308:00:123
266747199191,14cyclictest0-21swapper/312:25:163
266747199191,14cyclictest0-21swapper/308:24:013
266747199191,14cyclictest0-21swapper/307:25:123
266747199191,13cyclictest2796083-21chrt09:10:103
266747199191,11cyclictest2735037-21taskset08:10:153
2667471991910,5cyclictest28853922sleep310:35:123
27855932182,5sleep12785612-21apt-get09:00:111
266747199184,10cyclictest2928518-21chrt11:15:153
266747199182,10cyclictest2957451-21taskset11:40:163
2667471991816,1cyclictest0-21swapper/308:35:153
2667471991815,1cyclictest0-21swapper/311:45:183
2667471991815,1cyclictest0-21swapper/307:40:153
2667471991814,2cyclictest0-21swapper/311:10:163
266747199181,13cyclictest0-21swapper/308:45:183
28420102171,11sleep12842124-21rt-features09:50:221
28420102171,11sleep12842124-21rt-features09:50:211
266747199172,10cyclictest2893164-21taskset10:40:173
266747199172,10cyclictest2806276-21taskset09:20:013
2667471991715,1cyclictest0-21swapper/308:20:003
2667471991714,1cyclictest0-21swapper/310:55:163
2667471991714,1cyclictest0-21swapper/309:35:153
2667471991714,1cyclictest0-21swapper/307:15:263
2667471991713,2cyclictest0-21swapper/308:44:593
2667471991713,2cyclictest0-21swapper/308:30:003
2667471991712,3cyclictest0-21swapper/310:25:093
266747199171,10cyclictest2941174-21taskset11:25:143
266747199171,10cyclictest2848445-21taskset10:00:003
266747199170,13cyclictest0-21swapper/309:40:103
29069522161,3sleep22908046-21kthreadcore10:55:152
27381302161,3sleep10-21swapper/108:15:101
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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