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2026-03-21 - 04:31

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 Mar 21, 2026 00:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3497707993734,2cyclictest3721337-21kworker/u8:4+events_unbound22:45:231
3497707993734,2cyclictest3721337-21kworker/u8:4+events_unbound22:45:221
3497707993632,2cyclictest3743353-21kworker/u8:1+events_unbound23:45:141
3497710993528,5cyclictest3534652-21latency_hist19:45:022
3497710993326,5cyclictest3539763-21latency_hist19:50:012
3497707993329,3cyclictest3539781-21kworker/u8:1+events_unbound21:50:151
3497707993126,4cyclictest3513134-21latency_hist19:25:011
3497705993127,3cyclictest3503067-21apt-get19:15:110
3497707993026,3cyclictest3571181-21kworker/u8:0+flush-259:020:35:201
3497707993026,3cyclictest3539781-21kworker/u8:1+flush-259:021:05:211
3497710992922,5cyclictest3752743-21apt-get23:15:112
3497707992926,2cyclictest3743353-21kworker/u8:1+flush-259:023:25:241
3497707992926,2cyclictest3743353-21kworker/u8:1+flush-259:000:15:251
3497715992822,4cyclictest3716230-21apt-get22:40:093
3497710992822,4cyclictest252-21systemd-journal23:14:452
3497707992822,4cyclictest3685098-21latency_hist22:10:001
3497705992824,3cyclictest3581505-21kworker/u8:2+flush-259:020:30:160
3497705992824,3cyclictest3581505-21kworker/u8:2+flush-259:020:30:150
3497705992822,4cyclictest3565141-21ntpq20:10:190
3497705992723,3cyclictest3539781-21kworker/u8:1+flush-259:021:05:250
3497705992721,4cyclictest3649184-21latency_hist21:35:010
3497705992720,5cyclictest3663654-21ntpq21:45:190
3497710992623,2cyclictest3539781-21kworker/u8:1+flush-259:020:05:212
3497707992623,2cyclictest3674873-21kworker/u8:2+events_unbound22:20:241
3497707992623,2cyclictest3592438-21kworker/u8:3+flush-259:020:45:201
3497707992622,3cyclictest3747580-21apt-get23:10:091
3497707992622,3cyclictest3534909-21apt-get19:45:111
3497707992622,2cyclictest3773724-21apt-get23:35:121
3497705992621,3cyclictest3524588-21apt-get19:35:120
3497707992521,3cyclictest3674873-21kworker/u8:2+flush-259:022:55:001
3497707992520,3cyclictest252-21systemd-journal23:17:001
3497707992518,3cyclictest3539993-21kworker/u8:4+events_unbound19:50:161
3497715992420,3cyclictest3518319-21gpgv19:30:013
3497710992421,2cyclictest3540026-21apt-get19:50:112
3497707992422,1cyclictest3539993-21kworker/u8:4+events_unbound20:15:221
3497707992421,3cyclictest3737055-21kworker/u8:0+events_unbound23:33:441
3497707992421,2cyclictest3737055-21kworker/u8:0+flush-259:000:00:201
3497707992418,4cyclictest3518299-21latency_hist19:30:021
3497707992417,5cyclictest3522990-21ntpq19:30:191
3497705992418,4cyclictest3737055-21kworker/u8:0+flush-259:023:35:250
3497705992417,5cyclictest3824045-21ntpq00:20:210
3497715992318,4cyclictest3809878-21diskstats00:10:133
3497710992320,2cyclictest3743353-21kworker/u8:1+flush-259:023:25:182
3497710992317,4cyclictest3804344-21latency_hist00:05:012
3497707992320,2cyclictest3539781-21kworker/u8:1+flush-259:020:40:211
3497707992319,3cyclictest3643991-21kworker/u8:0+events_unbound22:16:461
3497707992319,3cyclictest3586646-21systemd-run20:35:001
3497707992319,3cyclictest3586646-21systemd-run20:35:001
3497707992319,3cyclictest1454795-21kworker/u8:2+flush-259:019:40:231
3497705992319,3cyclictest3508208-21apt-get19:20:110
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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