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2025-11-23 - 02:11

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 Sun Nov 23, 2025 00:43:58)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
224967622430,9sleep10-21swapper/100:35:221
1778114213661,68sleep30-21swapper/319:05:143
178269128856,10sleep20-21swapper/219:08:542
178248828352,10sleep10-21swapper/119:06:201
178263627555,14sleep00-21swapper/019:08:120
20405472261,3sleep00-21swapper/022:25:320
178290299252,17cyclictest2125133-21taskset23:20:113
178290299252,17cyclictest1937317-21taskset21:25:143
1782902992511,11cyclictest0-21swapper/321:19:053
19456912241,11sleep01945721-21forks21:30:120
1782902992420,2cyclictest0-21swapper/300:30:373
22212392231,2sleep00-21swapper/000:19:510
1782902992320,1cyclictest0-21swapper/323:17:453
1782902992320,1cyclictest0-21swapper/320:40:013
1782902992320,1cyclictest0-21swapper/300:20:193
1782902992317,2cyclictest0-21swapper/322:41:033
1782902992311,9cyclictest1846350-21chrt20:05:173
178290299231,16cyclictest1975765-21chrt21:46:513
178290299222,13cyclictest2197231-21taskset00:04:093
178290299222,13cyclictest2197231-21taskset00:04:083
1782902992219,1cyclictest0-21swapper/300:35:173
1782902992218,2cyclictest0-21swapper/323:30:003
1782902992217,3cyclictest0-21swapper/321:31:173
1782902992217,2cyclictest0-21swapper/323:05:113
21315302211,3sleep10-21swapper/123:22:551
20102282216,9sleep01912456-21diskmemload22:09:330
19693982211,3sleep00-21swapper/021:44:390
178290299219,9cyclictest1843074-21chrt20:00:573
178290299212,13cyclictest2156598-21taskset23:38:483
178290299212,13cyclictest2041113-21taskset22:26:243
178290299212,12cyclictest1991279-21taskset21:55:333
178290299211,9cyclictest2057941-21taskset22:37:223
1782902992117,2cyclictest0-21swapper/322:55:153
1782902992117,2cyclictest0-21swapper/300:15:013
178290299211,16cyclictest2204831-21chrt00:08:413
178290299211,15cyclictest2093376-21chrt23:00:143
20914412204,4sleep2431ktimers/222:58:342
178290299202,14cyclictest2165485-21sleep23:44:593
1782902992018,1cyclictest0-21swapper/321:00:213
1782902992018,1cyclictest0-21swapper/300:25:123
1782902992017,1cyclictest0-21swapper/322:46:183
1782902992016,2cyclictest0-21swapper/319:19:423
1782902992015,2cyclictest0-21swapper/322:50:153
1782902992014,3cyclictest0-21swapper/323:56:243
1782902992014,3cyclictest0-21swapper/322:21:103
178290299201,15cyclictest1969384-21chrt21:44:373
178290299200,13cyclictest2017948-21taskset22:13:483
178290299192,13cyclictest2049906-21taskset22:32:283
178290299192,13cyclictest2024729-21taskset22:16:333
178290299192,11cyclictest1978751-21taskset21:50:153
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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