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2025-12-04 - 05:03

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 Thu Dec 04, 2025 00:43:59)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1449070212998,10sleep10-21swapper/119:06:091
1449189211760,53sleep30-21swapper/319:07:393
144915828659,19sleep00-21swapper/019:07:160
144928627661,9sleep20-21swapper/219:08:542
15787712291,18sleep01578801-21perf21:10:000
1449502992824,2cyclictest0-21swapper/321:12:393
1449502992622,2cyclictest0-21swapper/323:00:263
1449502992522,1cyclictest0-21swapper/321:40:003
1449502992520,3cyclictest0-21swapper/322:20:153
1449502992519,3cyclictest0-21swapper/323:35:203
1449502992421,1cyclictest0-21swapper/322:55:143
1449502992420,2cyclictest0-21swapper/322:25:193
1449502992320,1cyclictest0-21swapper/320:55:133
144950299231,19cyclictest1724634-21taskset22:37:543
144950299231,19cyclictest1724634-21taskset22:37:543
16748942221,11sleep21674900-21ssh22:07:112
144950299222,14cyclictest1594157-21taskset21:18:443
144950299222,13cyclictest1806217-21taskset23:26:493
1449502992219,1cyclictest0-21swapper/323:49:083
1449502992218,2cyclictest0-21swapper/321:50:003
1449502992218,2cyclictest0-21swapper/300:35:263
1449502992218,2cyclictest0-21swapper/300:00:173
144950299221,17cyclictest1644163-21taskset21:50:033
144950299212,13cyclictest1790359-21taskset23:17:473
144950299212,13cyclictest1774425-21taskset23:08:253
144950299212,13cyclictest1674286-21taskset22:06:153
1449502992118,1cyclictest0-21swapper/321:20:193
144950299211,14cyclictest1709507-21sleep22:34:553
144950299201,7cyclictest0-21swapper/323:12:103
1449502992016,2cyclictest0-21swapper/319:22:133
144950299201,14cyclictest1792729-21chrt23:20:153
144950299201,14cyclictest1578791-21turbostat21:10:003
18887932190,10sleep01578785-21diskmemload00:19:140
17895622191,2sleep00-21swapper/023:16:360
144950299192,13cyclictest1830451-21taskset23:41:083
144950299192,13cyclictest1618717-21taskset21:34:003
144950299192,12cyclictest1880298-21taskset00:12:473
144950299192,12cyclictest1667409-21taskset22:03:183
144950299192,11cyclictest1866163-21taskset00:05:093
1449502991916,1cyclictest0-21swapper/300:25:193
1449502991916,1cyclictest0-21swapper/300:25:183
1449502991915,2cyclictest0-21swapper/322:15:253
1449502991914,3cyclictest0-21swapper/300:15:203
1449502991912,4cyclictest0-21swapper/323:30:103
1449502991911,4cyclictest16352082sleep321:44:113
144950299191,14cyclictest0-21swapper/300:30:033
144950299191,10cyclictest1855327-21taskset23:56:233
1449502991910,5cyclictest16573882sleep321:55:333
144950299190,14cyclictest0-21swapper/321:25:093
18728732181,11sleep11578785-21diskmemload00:08:291
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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