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2026-04-15 - 11:44

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 Wed Apr 15, 2026 00:44:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3774336994941,6cyclictest252-21systemd-journal23:05:012
3774333994034,4cyclictest4008538-21latency_hist22:55:011
3774333993833,3cyclictest3779660-21/usr/sbin/munin19:15:151
3774336993733,3cyclictest4008556-21kworker/u8:0+flush-259:000:02:162
3774336993629,5cyclictest3805171-21latency_hist19:40:002
3774333993630,4cyclictest3841213-21latency_hist20:15:011
3774331993632,3cyclictest3877270-21kworker/u8:0+events_unbound21:35:140
377433199360,35cyclictest1-21systemd21:25:000
3774336993529,4cyclictest509-21rs:main2
3774331993532,2cyclictest4008556-21kworker/u8:0+events_unbound00:20:150
3774331993532,2cyclictest3935107-21kworker/u8:3+flush-259:022:35:180
3774341993429,3cyclictest4055497-21apt-get23:40:113
3774341993427,4cyclictest3825703-21latency_hist20:00:013
3774341993423,9cyclictest4002947-21apt-get22:50:033
3774336993430,3cyclictest3805396-21kworker/u8:2+flush-259:020:25:202
3774336993430,3cyclictest3763727-21kworker/u8:0+flush-259:019:20:202
3774333993430,3cyclictest3794792-21kworker/u8:1+flush-259:019:30:161
3774331993428,4cyclictest3841451-21/usr/sbin/munin20:15:150
3774333993228,2cyclictest3909470-21apt-get21:20:111
3774333993226,4cyclictest4101583-21latency_hist00:25:011
3774331993229,2cyclictest3951187-21kworker/u8:2+events_unbound22:05:120
3774331993228,3cyclictest4008556-21kworker/u8:0+flush-259:000:10:250
3774331993226,4cyclictest3850697-21ntpq20:20:220
3774341993024,4cyclictest3872732-21latency_hist20:45:013
3774333993024,4cyclictest3966726-21apt-get22:15:121
3774336992925,3cyclictest3935107-21kworker/u8:3+events_unbound23:20:142
3774341992826,1cyclictest3851380-21fwupd20:23:123
3774341992822,4cyclictest3878276-21latency_hist20:50:013
3774336992823,3cyclictest252-21systemd-journal20:56:102
3774333992822,4cyclictest3951045-21base6422:00:001
3774331992825,2cyclictest3971679-21kworker/u8:0+flush-259:022:23:130
3774331992825,2cyclictest3935107-21kworker/u8:3+events_unbound22:30:220
3774331992825,2cyclictest3877270-21kworker/u8:0+events_unbound21:05:160
3774331992824,3cyclictest3982423-21kworker/u8:1+events_unbound23:02:110
3774331992823,4cyclictest3888897-21apt-get21:00:120
3774341992722,3cyclictest252-21systemd-journal20:16:103
3774341992721,4cyclictest252-21systemd-journal21:00:003
3774336992723,3cyclictest4045162-21kworker/u8:1+events_unbound23:45:142
3774336992723,3cyclictest3794792-21kworker/u8:1+flush-259:020:10:212
3774336992723,3cyclictest3794792-21kworker/u8:1+events_unbound20:05:132
3774333992720,4cyclictest252-21systemd-journal20:42:101
3774331992723,3cyclictest3763727-21kworker/u8:0+events_unbound19:20:140
3774341992623,2cyclictest4008556-21kworker/u8:0+flush-259:023:45:263
3774341992622,3cyclictest4101627-21kworker/u8:1+flush-259:000:30:173
3774341992620,4cyclictest4085837-40mandb00:06:273
3774341992620,4cyclictest3820563-21latency_hist19:55:003
3774336992622,3cyclictest4008556-21kworker/u8:0+events_unbound23:41:102
3774336992622,3cyclictest3935107-21kworker/u8:3+events_unbound23:25:202
3774333992621,3cyclictest3789570-21kworker/u8:3+flush-259:019:35:171
3774331992623,2cyclictest3800041-21kworker/u8:0+events_unbound19:45:140
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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