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2026-03-16 - 23:12

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 Mon Mar 16, 2026 12:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3711383994643,2cyclictest3652697-21kworker/u8:0+flush-259:007:45:012
3711387994037,2cyclictest3944300-21kworker/u8:0+flush-259:011:00:203
3711382994037,2cyclictest3777884-21kworker/u8:2+flush-259:009:55:001
3711387993835,2cyclictest3777884-21kworker/u8:2+flush-259:008:35:233
3711387993731,4cyclictest4011691-21latency_hist12:00:013
3711387993431,2cyclictest3658078-21kworker/u8:3+events_unbound07:40:173
3711383993431,2cyclictest3882038-21kworker/u8:0+events_unbound10:40:202
3711387993330,2cyclictest3652697-21kworker/u8:0+flush-259:007:15:003
3711387993326,5cyclictest3809425-21latency_hist08:45:013
3711387993229,2cyclictest3815267-21kworker/u8:3+flush-259:008:50:243
3711379993227,3cyclictest3970328-21apt-get11:20:100
3711387993129,2cyclictest3892334-21kworker/u8:3+events_unbound10:30:143
3711387993129,1cyclictest3882038-21kworker/u8:0+events_unbound10:15:233
3711387993128,2cyclictest3777884-21kworker/u8:2+flush-259:009:35:153
3711387993128,2cyclictest3777884-21kworker/u8:2+flush-259:009:25:223
3711383993125,4cyclictest3851571-21diskstats09:25:122
3711387993027,2cyclictest3969938-21kworker/u8:4+events_unbound11:30:133
3711383993027,2cyclictest3652697-21kworker/u8:0+events_unbound07:20:182
3711379993026,3cyclictest3928609-21kworker/u8:2+events_unbound11:10:170
3711379992925,3cyclictest3658078-21kworker/u8:3+events_unbound07:30:000
3711387992823,3cyclictest3944300-21kworker/u8:0+flush-259:011:15:163
3711387992823,3cyclictest3944300-21kworker/u8:0+flush-259:011:15:153
3711387992823,3cyclictest3658078-21kworker/u8:3+flush-259:007:15:173
3711387992822,4cyclictest3777884-21kworker/u8:2+events_unbound09:30:163
3711379992824,3cyclictest3652697-21kworker/u8:0+flush-259:007:20:160
3711387992723,3cyclictest3969938-21kworker/u8:4+flush-259:012:20:253
3711383992723,3cyclictest3969938-21kworker/u8:4+flush-259:011:55:262
3711382992721,4cyclictest3824469-21ntpq08:55:201
3711382992721,4cyclictest3824469-21ntpq08:55:201
3711379992721,5cyclictest3772236-21ntpq08:05:220
3711379992721,4cyclictest3798749-21apt-get08:35:000
3711387992623,2cyclictest3882038-21kworker/u8:0+flush-259:010:40:163
3711387992623,2cyclictest3777884-21kworker/u8:2+flush-259:009:15:203
3711387992620,4cyclictest3793610-21latency_hist08:30:013
3711387992618,6cyclictest3798753-21latency_hist08:35:003
3711382992623,2cyclictest3747367-21kworker/u8:2+flush-259:007:55:011
3711382992621,4cyclictest3969215-21ntpq11:15:201
3711382992621,4cyclictest3969215-21ntpq11:15:201
3711382992621,3cyclictest3892553-21/usr/sbin/munin10:05:151
3711379992623,2cyclictest3777884-21kworker/u8:2+flush-259:009:45:000
3711387992521,3cyclictest3658078-21kworker/u8:3+events_unbound08:10:193
3711387992521,3cyclictest3652697-21kworker/u8:0+flush-259:007:50:013
3711382992520,3cyclictest3825384-21kworker/u8:1+flush-259:009:20:161
3711379992522,2cyclictest3861704-21apt-get09:35:110
3711387992421,2cyclictest3652697-21kworker/u8:0+events_unbound07:30:233
3711387992420,3cyclictest3752726-21apt-get07:50:113
3711382992419,4cyclictest3757887-21apt-get07:55:111
3711382992419,3cyclictest3939379-21apt-get10:50:121
3711383992319,3cyclictest3767915-21kworker/u8:0+events_unbound08:40:222
3711383992319,3cyclictest1-21systemd07:15:002
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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