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2026-01-03 - 07:57

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 Sat Jan 03, 2026 00:44:47)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
15760472280216,54sleep60-21swapper/619:07:336
15760472280216,54sleep60-21swapper/619:07:336
15760662275267,5sleep70-21swapper/719:07:507
15760662275267,5sleep70-21swapper/719:07:507
15761612274266,5sleep50-21swapper/519:09:105
15761612274266,5sleep50-21swapper/519:09:105
15759792265256,6sleep30-21swapper/319:06:503
15759792265256,6sleep30-21swapper/319:06:503
15761482255215,16sleep10-21swapper/119:08:571
15761482255215,16sleep10-21swapper/119:08:571
15760522249207,18sleep20-21swapper/219:07:372
15760522249207,18sleep20-21swapper/219:07:372
15760352246204,32sleep40-21swapper/419:07:244
15760352246204,32sleep40-21swapper/419:07:244
15760592243219,16sleep00-21swapper/019:07:430
15760592243219,16sleep00-21swapper/019:07:430
1576555993432,1cyclictest1595257-21ntp_states19:40:206
1576533993130,1cyclictest0-21swapper/121:55:141
1576528993130,1cyclictest0-21swapper/023:04:590
1576551992924,3cyclictest1586131-21cstates19:25:115
1576551992922,5cyclictest527-21systemd-journal21:58:295
1576551992823,4cyclictest527-21systemd-journal22:48:145
1576551992720,5cyclictest527-21systemd-journal21:02:165
157655199270,25cyclictest0-21swapper/523:02:305
1576546992721,5cyclictest1380-21snmpd23:52:374
157653399270,25cyclictest0-21swapper/123:43:191
157656099260,22cyclictest0-21swapper/700:21:317
1576551992622,4cyclictest527-21systemd-journal22:03:275
1576551992619,5cyclictest1720106-21df23:30:135
1576551992619,5cyclictest1609919-21abrt-dump-journ20:34:355
157655199260,25cyclictest527-21systemd-journal23:15:585
1576546992622,3cyclictest1380-21snmpd21:11:074
1576546992620,5cyclictest1380-21snmpd22:51:464
157653399260,22cyclictest0-21swapper/120:56:341
1576560992521,3cyclictest1380-21snmpd00:06:117
1576560992521,3cyclictest1380-21snmpd00:06:117
1576551992521,3cyclictest1701764-21ntpq22:55:215
1576551992521,3cyclictest1676803-21awk22:10:125
1576551992521,3cyclictest1380-21snmpd22:33:085
1576551992521,3cyclictest1380-21snmpd21:09:015
1576551992520,4cyclictest1380-21snmpd22:27:295
157655199250,25cyclictest1374-21arpwatch00:18:355
157655199250,23cyclictest0-21swapper/523:51:435
1576546992518,6cyclictest1380-21snmpd00:25:284
157654699250,23cyclictest0-21swapper/422:15:144
157654699250,22cyclictest0-21swapper/421:27:144
157654699250,22cyclictest0-21swapper/421:27:144
1576542992521,3cyclictest1380-21snmpd23:12:333
1576542992521,3cyclictest1125-21lldpd20:41:313
1576542992518,5cyclictest0-21swapper/322:10:523
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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