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2026-07-18 - 11:31

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #4

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.

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 rackeslot4s.osadl.org (updated Sat Jul 18, 2026 00:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2677243994437,5cyclictest2733930-21latency_hist20:05:000
2677243993833,4cyclictest335557-21systemd-journal19:30:000
2677245993733,3cyclictest2972921-21kworker/u8:1+flush-259:000:05:241
2677243993731,4cyclictest2801679-21apt-get21:10:120
2677245993632,2cyclictest2832412-21kworker/u8:3+flush-259:022:00:251
2677248993428,4cyclictest2708115-21latency_hist19:40:012
2677245993226,4cyclictest335557-21systemd-journal23:08:301
2677253993124,5cyclictest335557-21systemd-journal20:10:003
2677245993127,2cyclictest2863634-21kworker/u8:2+flush-259:022:55:261
2677253993027,2cyclictest2764912-21kworker/u8:0+flush-259:020:40:003
2677248993026,3cyclictest335557-21systemd-journal21:15:302
2677245993026,3cyclictest2972921-21kworker/u8:1+events_unbound00:20:161
2677253992925,3cyclictest2915442-21kworker/u8:1+events_unbound23:30:243
2677248992926,2cyclictest2667006-21kworker/u8:1+flush-259:019:20:232
2677248992925,3cyclictest335557-21systemd-journal00:10:002
2677245992926,2cyclictest2951812-21kworker/u8:2+flush-259:023:55:211
2677245992926,2cyclictest2951812-21kworker/u8:2+flush-259:000:00:291
2677245992925,3cyclictest2827166-21kworker/u8:2+events_unbound21:40:221
2677245992924,4cyclictest2703209-21apt-get19:35:111
2677253992825,2cyclictest2780774-21kworker/u8:2+events_unbound21:05:183
2677253992824,3cyclictest2837805-21apt-get21:45:123
2677245992823,3cyclictest2718457-21kworker/u8:1+events_unbound21:20:221
2677245992724,2cyclictest2733551-21kworker/u8:0+flush-259:020:10:091
2677245992723,3cyclictest2796211-21kworker/u8:0+events_unbound22:08:311
2677245992720,5cyclictest2748560-21ntpq20:15:221
2677243992721,4cyclictest2992713-21ntpq00:10:200
2677253992623,2cyclictest3014151-21kworker/u8:3+flush-259:000:35:163
2677253992623,2cyclictest2832412-21kworker/u8:3+flush-259:022:15:013
2677253992622,2cyclictest2951812-21kworker/u8:2+events_unbound23:40:003
2677248992623,2cyclictest2951812-21kworker/u8:2+flush-259:023:45:312
2677245992623,2cyclictest2676949-21kworker/u8:2+events_unbound19:55:171
2677245992623,2cyclictest2676949-21kworker/u8:2+events_unbound19:40:121
2677245992622,3cyclictest2926155-21kworker/u8:0+flush-259:023:15:221
2677245992621,3cyclictest2692681-21kworker/u8:3+flush-259:019:25:111
2677243992622,3cyclictest2848135-21apt-get21:55:120
2677248992523,2cyclictest2983105-21kworker/u8:0+flush-259:000:05:002
2677248992522,2cyclictest2972921-21kworker/u8:1+flush-259:000:15:262
2677248992521,3cyclictest335557-21systemd-journal19:50:312
2677245992521,3cyclictest2894694-21kworker/u8:0+flush-259:022:50:111
2677245992521,3cyclictest2667006-21kworker/u8:1+events_unbound19:20:211
2677245992520,4cyclictest335557-21systemd-journal23:40:001
2677245992517,5cyclictest2967274-21latency_hist23:50:021
2677243992519,4cyclictest2749433-21latency_hist20:20:010
2677243992518,5cyclictest2945767-21ntpq23:25:230
2677248992420,3cyclictest2806592-21kworker/u8:3+flush-259:021:30:202
2677245992422,1cyclictest2692681-21kworker/u8:3+events_unbound19:51:301
2677245992420,3cyclictest3014151-21kworker/u8:3+events_unbound00:36:311
2677245992420,3cyclictest2796211-21kworker/u8:0+flush-259:022:11:561
2677245992420,3cyclictest2759693-21kworker/u8:2+events_unbound20:32:321
2677245992420,3cyclictest2733551-21kworker/u8:0+flush-259:020:20:271
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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