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2026-07-15 - 18:18

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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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 50 highest latencies:
System rack1slot6s.osadl.org (updated Wed Jul 15, 2026 12:43:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2194991000,4rtkit-daemon2193-21rtkit-daemon08:57:210
8499999819,60cyclictest475-21ssh09:10:342
8499999819,60cyclictest475-21ssh09:10:342
849999964,12cyclictest0-21swapper/209:05:392
849999954,71cyclictest0-21swapper/211:30:102
849999954,69cyclictest0-21swapper/210:30:042
8499999511,13cyclictest0-21swapper/211:15:422
8499999511,13cyclictest0-21swapper/211:15:422
849999944,69cyclictest0-21swapper/210:35:282
849999944,69cyclictest0-21swapper/210:35:282
849999944,69cyclictest0-21swapper/208:45:482
8499999418,56cyclictest0-21swapper/209:02:482
849999938,12cyclictest0-21swapper/208:39:412
849999938,12cyclictest0-21swapper/208:39:412
849999934,72cyclictest0-21swapper/208:55:382
849999925,12cyclictest1227-21runrttasks11:20:232
849999924,70cyclictest0-21swapper/210:05:392
849999924,66cyclictest0-21swapper/211:30:332
849999924,65cyclictest0-21swapper/211:07:122
849999924,14cyclictest0-21swapper/211:04:382
849999924,14cyclictest0-21swapper/209:24:332
849999924,13cyclictest0-21swapper/211:40:242
8499999218,56cyclictest14838-21ssh09:30:452
849999915,61cyclictest12431-21fschecks_time08:40:342
849999915,14cyclictest0-21swapper/209:15:432
8499999118,51cyclictest0-21swapper/207:10:492
8499999118,51cyclictest0-21swapper/207:10:492
849999904,77cyclictest30161-21grep10:40:442
849999904,72cyclictest0-21swapper/210:24:312
849999904,64cyclictest0-21swapper/211:50:262
849999904,64cyclictest0-21swapper/211:50:262
849999904,13cyclictest0-21swapper/209:40:252
849999904,13cyclictest0-21swapper/207:05:202
8499999010,69cyclictest0-21swapper/207:05:422
849999895,68cyclictest24062-21diskstats09:45:282
849999895,61cyclictest0-21swapper/210:45:392
849999894,63cyclictest0-21swapper/211:36:322
849999894,63cyclictest0-21swapper/210:34:322
849999894,63cyclictest0-21swapper/210:15:312
849999894,14cyclictest0-21swapper/210:00:022
849999894,14cyclictest0-21swapper/210:00:022
849999894,13cyclictest0-21swapper/209:35:452
849999893,20cyclictest1084-21lldpd06:54:382
849999885,63cyclictest0-21swapper/207:30:532
849999884,17cyclictest0-21swapper/210:04:432
849999884,14cyclictest0-21swapper/209:55:122
8499998822,45cyclictest0-21swapper/206:40:492
8499998812,10cyclictest0-21swapper/211:49:112
849999874,73cyclictest0-21swapper/211:10:392
849999874,68cyclictest0-21swapper/208:51:432
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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