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2026-05-02 - 03:29

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 May 02, 2026 00:44:07)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3610064995449,3cyclictest252-21systemd-journal00:35:153
3610053994336,5cyclictest3822086-21latency_hist22:35:000
3610053994336,5cyclictest3822086-21latency_hist22:35:000
3610053993933,4cyclictest3888752-21ntpq23:35:210
3610056993833,3cyclictest3920536-21latency_hist00:10:012
3610056993629,5cyclictest3729333-21latency_hist21:05:012
3610054993629,5cyclictest3842965-21cat22:55:001
3610053993529,4cyclictest3800520-21ntpq22:10:220
3610056993429,4cyclictest3785729-21kworker/u8:3+flush-259:022:10:172
3610053993428,4cyclictest3662298-21diskstats20:00:140
3610053993330,2cyclictest3625784-21kworker/u8:1+flush-259:019:50:230
3610053993327,4cyclictest3785122-21ntpq21:55:200
3610056993227,3cyclictest3801424-21kworker/u8:2+flush-259:023:25:172
3610056993124,5cyclictest3733599-21ntpq21:05:192
3610053993125,4cyclictest252-21systemd-journal00:25:000
3610053993124,5cyclictest3686765-21ntpq20:20:210
3610053993124,5cyclictest3686765-21ntpq20:20:200
3610064993026,3cyclictest3843455-21kworker/u8:0+flush-259:023:00:273
3610056992925,3cyclictest3843455-21kworker/u8:0+flush-259:023:45:162
3610053992922,5cyclictest3946387-21latency_hist00:35:000
3610056992823,4cyclictest3682545-21kworker/u8:2+flush-259:021:55:002
3610054992823,4cyclictest3724427-21apt-get21:00:111
3610054992822,4cyclictest3656703-21latency_hist19:55:011
3610054992715,3cyclictest3832711-21apt-get22:45:101
3610053992724,2cyclictest3874203-21kworker/u8:3+flush-259:023:45:240
3610053992720,5cyclictest3874179-21latency_hist23:25:020
3610053992621,3cyclictest3843455-21kworker/u8:0+flush-259:023:10:150
3610056992522,2cyclictest3880567-21kworker/u8:1+flush-259:000:00:002
3610053992522,2cyclictest3843455-21kworker/u8:0+events_unbound23:05:220
3610053992520,4cyclictest3822343-21apt-get22:35:110
3610053992520,4cyclictest3822343-21apt-get22:35:110
3610053992520,4cyclictest3801424-21kworker/u8:2+events_unbound23:25:220
3610064992418,4cyclictest3791352-21kworker/u8:0+flush-259:022:25:003
3610054992419,4cyclictest252-21systemd-journal20:46:561
3610054992418,5cyclictest3874448-21apt-get23:25:121
3610054992418,5cyclictest3624888-21ntpq19:20:171
3610054992418,4cyclictest3791129-21latency_hist22:05:001
3610053992420,3cyclictest3682545-21kworker/u8:2+events_unbound20:55:220
3610053992419,4cyclictest3905383-21apt-get23:55:120
3610064992320,2cyclictest3791352-21kworker/u8:0+events_unbound22:15:203
3610064992319,3cyclictest3641311-21kworker/u8:2+flush-259:019:50:203
3610064992317,4cyclictest3646435-21latency_hist19:45:013
3610054992316,5cyclictest3749048-21ntpq21:20:191
3610053992319,3cyclictest3682545-21kworker/u8:2+events_unbound21:00:230
3610053992319,2cyclictest1-21systemd00:16:160
3610053992315,6cyclictest3672195-21latency_hist20:10:010
3610064992220,1cyclictest3714070-21kworker/u8:3+events_unbound20:50:203
3610064992218,3cyclictest3905139-21kworker/u8:2+flush-259:000:05:303
3610064992218,3cyclictest3765447-21kworker/u8:1+flush-259:021:45:243
3610064992217,4cyclictest3895053-21/usr/sbin/munin23:45:143
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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