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2026-03-11 - 04:37

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 Wed Mar 11, 2026 00:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2012639212157,57sleep30-21swapper/319:08:423
200777629059,9sleep20-21swapper/219:05:082
201247328453,12sleep10-21swapper/119:06:351
201205228152,6sleep00-21swapper/019:05:250
22126892401,12sleep02212700-21sshd21:49:190
22126892401,12sleep02212700-21sshd21:49:180
201283999245,15cyclictest2500486-21taskset00:31:593
2012839992412,8cyclictest2231160-21taskset22:00:103
2012839992219,1cyclictest0-21swapper/322:05:163
24722822212,14sleep12472428-21/usr/sbin/munin00:15:201
2012839992118,1cyclictest0-21swapper/321:58:003
2012839992117,2cyclictest0-21swapper/322:55:203
201283999211,16cyclictest2308156-21taskset22:42:403
201283999210,2cyclictest0-21swapper/323:10:583
24860472201,15sleep12486210-21head00:25:141
22977632201,2sleep00-21swapper/022:35:370
22474462201,2sleep20-21swapper/222:08:572
201283999205,10cyclictest2132816-21taskset21:00:103
2012839992017,1cyclictest0-21swapper/321:20:283
2012839992016,2cyclictest0-21swapper/323:58:393
2012839992015,2cyclictest0-21swapper/300:19:373
201283999201,15cyclictest0-21swapper/323:26:503
24826272190,2sleep00-21swapper/000:21:230
21165732190,7sleep0151ktimers/020:44:590
201283999198,8cyclictest2397418-21turbostat23:39:553
2012839991917,1cyclictest0-21swapper/321:05:203
2012839991916,1cyclictest0-21swapper/323:46:143
2012839991916,1cyclictest0-21swapper/323:02:003
2012839991916,1cyclictest0-21swapper/300:10:413
2012839991915,2cyclictest0-21swapper/323:16:433
2012839991914,2cyclictest0-21swapper/321:50:143
2012839991913,4cyclictest0-21swapper/322:49:533
2012839991912,4cyclictest0-21swapper/319:35:333
201283999191,15cyclictest0-21swapper/322:39:373
201283999191,15cyclictest0-21swapper/322:28:563
201283999191,14cyclictest0-21swapper/323:40:113
201283999191,14cyclictest0-21swapper/323:07:203
2012839991910,2cyclictest0-21swapper/322:19:583
24071632182,11sleep12407954-21cat23:40:151
23687962180,3sleep10-21swapper/123:16:551
23154072181,3sleep00-21swapper/022:45:430
21771552180,1sleep20-21swapper/221:28:362
2012839991816,1cyclictest0-21swapper/319:15:133
2012839991815,1cyclictest0-21swapper/321:18:163
2012839991814,2cyclictest0-21swapper/322:50:123
2012839991814,2cyclictest0-21swapper/321:42:313
2012839991814,2cyclictest0-21swapper/300:00:013
2012839991812,3cyclictest0-21swapper/323:31:273
2012839991812,3cyclictest0-21swapper/321:36:383
201283999181,14cyclictest2430994-21taskset23:52:403
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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