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2026-06-09 - 06:20

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 Jun 09, 2026 00:44:45)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
21140182286218,16sleep40-21swapper/419:05:544
21143172270262,5sleep70-21swapper/719:09:437
21141802270219,16sleep10-21swapper/119:07:521
21142792247223,16sleep20-21swapper/219:09:142
21142982245220,17sleep30-21swapper/319:09:313
21142742245220,17sleep60-21swapper/619:09:106
21140032243219,16sleep00-21swapper/019:05:420
21139992243216,17sleep50-21swapper/519:05:395
2114634993632,2cyclictest0-21swapper/220:30:202
2114643993130,1cyclictest0-21swapper/400:00:144
211464399310,30cyclictest0-21swapper/419:10:204
211463899310,31cyclictest0-21swapper/321:55:103
211463899290,25cyclictest0-21swapper/321:00:053
211465299270,25cyclictest0-21swapper/620:50:296
2114647992721,5cyclictest1391-21snmpd21:57:105
2114647992721,5cyclictest1391-21snmpd21:35:095
211464799270,23cyclictest0-21swapper/519:12:055
211464399270,26cyclictest0-21swapper/400:20:174
2114638992726,1cyclictest0-21swapper/323:05:183
211463899270,25cyclictest0-21swapper/322:57:243
211463899270,25cyclictest0-21swapper/300:30:473
211465699260,22cyclictest0-21swapper/719:55:167
211464799260,24cyclictest0-21swapper/520:01:135
211464799260,22cyclictest0-21swapper/519:25:065
211464799260,1cyclictest0-21swapper/521:54:135
211464399260,25cyclictest0-21swapper/400:25:364
211464399260,22cyclictest0-21swapper/423:55:164
211464399260,22cyclictest0-21swapper/423:55:154
211464399260,22cyclictest0-21swapper/420:43:054
211463899260,22cyclictest0-21swapper/321:36:133
211463899260,22cyclictest0-21swapper/321:08:173
2114634992622,3cyclictest1391-21snmpd22:02:252
211463499260,1cyclictest0-21swapper/200:00:292
211462999260,22cyclictest0-21swapper/123:11:091
211462199260,24cyclictest0-21swapper/022:36:020
211462199260,22cyclictest0-21swapper/000:25:200
2114656992518,3cyclictest0-21swapper/722:51:087
2114656992518,3cyclictest0-21swapper/722:12:447
2114652992518,5cyclictest0-21swapper/620:46:416
2114652992518,3cyclictest0-21swapper/621:37:546
211465299250,23cyclictest0-21swapper/620:20:136
211464799256,5cyclictest2272953-21fw_packets23:55:135
211464799256,5cyclictest2272953-21fw_packets23:55:135
2114647992520,4cyclictest1391-21snmpd22:57:535
2114647992520,4cyclictest1391-21snmpd21:16:055
2114647992518,5cyclictest0-21swapper/500:22:155
2114638992521,3cyclictest1391-21snmpd22:30:293
2114634992521,3cyclictest1391-21snmpd22:24:432
2114634992518,5cyclictest2133455-21ntp_states19:40:212
2114634992518,5cyclictest0-21swapper/220:51:442
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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