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2026-07-07 - 21:16

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, 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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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

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 rack0slot3s.osadl.org (updated Tue Jul 07, 2026 00:44:46)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2278062266202,17sleep60-21swapper/618:21:356
2279632265256,6sleep50-21swapper/518:24:005
2280492264216,16sleep40-21swapper/418:25:214
2280992260214,17sleep20-21swapper/218:26:042
2280912259217,33sleep30-21swapper/318:25:563
2279772258233,16sleep10-21swapper/118:24:141
2279402249223,17sleep00-21swapper/018:23:360
2278072245219,17sleep70-21swapper/718:21:367
228418993921,17cyclictest1390-21snmpd21:46:490
228418993921,17cyclictest1390-21snmpd21:46:490
3955742290,0sleep10-21swapper/100:11:071
22845199270,22cyclictest0-21swapper/720:17:467
228418992722,4cyclictest1390-21snmpd23:41:010
22845199260,24cyclictest0-21swapper/723:25:087
228447992620,2cyclictest0-21swapper/622:01:256
228447992619,5cyclictest0-21swapper/622:12:456
22844299260,24cyclictest0-21swapper/520:14:115
22844299260,22cyclictest0-21swapper/521:56:595
22844299260,22cyclictest0-21swapper/519:03:345
22843399260,24cyclictest0-21swapper/323:15:063
22842999260,24cyclictest0-21swapper/219:29:412
228451992518,5cyclictest0-21swapper/721:00:197
228447992521,3cyclictest1390-21snmpd20:20:256
228447992518,3cyclictest0-21swapper/623:30:206
22844799250,1cyclictest0-21swapper/621:19:036
228442992521,3cyclictest1390-21snmpd23:22:595
228442992521,3cyclictest1390-21snmpd20:03:585
228442992518,5cyclictest0-21swapper/522:45:375
228438992521,3cyclictest1390-21snmpd20:30:334
22843899250,1cyclictest0-21swapper/421:27:084
22843899250,1cyclictest0-21swapper/420:32:174
228433992521,3cyclictest1390-21snmpd20:46:013
228429992522,2cyclictest382808-21cat23:43:102
228424992521,3cyclictest1390-21snmpd22:56:311
22842499250,24cyclictest0-21swapper/123:37:141
22842499250,1cyclictest0-21swapper/123:53:031
228418992521,3cyclictest1390-21snmpd21:24:280
228418992520,4cyclictest1390-21snmpd21:05:260
228418992518,5cyclictest0-21swapper/000:38:240
228418992518,5cyclictest0-21swapper/000:38:240
22841899250,22cyclictest0-21swapper/020:01:220
22841899250,22cyclictest0-21swapper/018:59:090
22841899250,1cyclictest0-21swapper/020:44:130
22841899250,1cyclictest0-21swapper/020:09:500
22841899250,15cyclictest0-21swapper/023:31:500
22845199240,22cyclictest0-21swapper/718:57:487
22845199240,22cyclictest0-21swapper/718:49:177
22845199240,22cyclictest0-21swapper/718:49:177
22845199240,1cyclictest0-21swapper/723:54:247
228447992420,3cyclictest1390-21snmpd23:05:236
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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