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2025-12-16 - 06:39

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #b, slot #8

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 rackbslot8s (updated Tue Dec 16, 2025 00:44:17)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
13195902132118,9sleep60-21swapper/619:05:506
13198442131116,9sleep70-21swapper/719:09:297
13195972131116,10sleep40-21swapper/419:05:564
13198302125110,9sleep20-21swapper/219:09:152
13198732124109,9sleep00-21swapper/019:09:530
1319840212496,9sleep30-21swapper/319:09:243
1319580212495,9sleep50-21swapper/519:05:415
13196702120105,10sleep10-21swapper/119:06:571
1320140991030,100cyclictest0-21swapper/621:55:156
1320138991030,100cyclictest0-21swapper/500:01:165
13201409910299,3cyclictest556-21snmpd21:13:496
13201409910299,3cyclictest556-21snmpd19:57:526
13201339910297,1cyclictest556-21snmpd21:57:424
1320121991020,99cyclictest0-21swapper/100:06:381
13201409910198,3cyclictest556-21snmpd22:07:156
1320140991010,101cyclictest0-21swapper/623:07:036
13201389910198,3cyclictest556-21snmpd21:05:405
13201389910198,3cyclictest556-21snmpd19:45:435
1320138991010,0cyclictest0-21swapper/520:23:415
13201339910199,2cyclictest556-21snmpd22:16:014
1320133991010,100cyclictest0-21swapper/421:53:574
1320133991010,100cyclictest0-21swapper/400:23:594
13201249910199,2cyclictest556-21snmpd20:16:082
13201249910199,2cyclictest556-21snmpd19:26:552
1320124991010,101cyclictest0-21swapper/221:00:342
1320124991010,100cyclictest0-21swapper/223:34:122
1320124991010,0cyclictest0-21swapper/223:35:032
1320121991010,99cyclictest0-21swapper/122:32:131
1320121991010,100cyclictest0-21swapper/122:43:201
1320121991010,100cyclictest0-21swapper/100:37:341
13201169910199,2cyclictest556-21snmpd22:47:560
13201169910199,2cyclictest556-21snmpd22:39:220
1320116991010,100cyclictest0-21swapper/022:40:340
1320116991010,100cyclictest0-21swapper/020:19:320
1320144991000,99cyclictest0-21swapper/723:58:077
1320144991000,99cyclictest0-21swapper/720:52:487
1320144991000,99cyclictest0-21swapper/719:36:197
1320144991000,99cyclictest0-21swapper/719:34:237
1320144991000,99cyclictest0-21swapper/719:28:587
1320144991000,100cyclictest0-21swapper/723:04:327
13201409910099,1cyclictest556-21snmpd23:43:166
13201409910099,1cyclictest556-21snmpd23:19:426
13201409910099,1cyclictest556-21snmpd22:46:176
13201409910099,1cyclictest556-21snmpd22:29:286
13201409910099,1cyclictest556-21snmpd20:46:066
13201409910099,1cyclictest556-21snmpd20:22:386
13201409910099,1cyclictest556-21snmpd20:04:086
13201409910097,3cyclictest556-21snmpd20:09:266
1320140991000,99cyclictest0-21swapper/622:30:156
1320140991000,100cyclictest0-21swapper/620:51:156
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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