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2026-06-18 - 08:27

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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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 Thu Jun 18, 2026 00:44:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3231214995652,3cyclictest3268241-21kworker/u8:2+events_unbound20:15:021
3231210994441,2cyclictest75-21kswapd022:41:040
3231210994441,2cyclictest3367648-21kworker/u8:2+flush-259:021:55:000
3231216994340,2cyclictest3268241-21kworker/u8:2+events_unbound20:15:162
3231216994339,3cyclictest3221187-21kworker/u8:1+events_unbound19:15:192
3231216994139,1cyclictest3455547-21fwupd22:41:012
3231216994138,2cyclictest3221187-21kworker/u8:1+flush-259:019:50:162
3231216994037,2cyclictest3367648-21kworker/u8:2+flush-259:021:40:242
3231216994037,2cyclictest3320766-21kworker/u8:0+events_unbound20:40:222
3231216994036,3cyclictest3221187-21kworker/u8:1+flush-259:019:25:232
3231216994034,4cyclictest3263065-21latency_hist19:40:012
3231210994037,2cyclictest3221187-21kworker/u8:1+flush-259:019:10:200
3231210993936,2cyclictest3377993-21kworker/u8:0+flush-259:022:00:210
3231216993834,3cyclictest3278570-21kworker/u8:3+flush-259:020:50:152
3231210993834,3cyclictest3247159-21apt-get19:20:560
3231216993633,2cyclictest3377993-21kworker/u8:0+events_unbound21:35:202
3231216993631,4cyclictest3362130-21gpgv21:15:002
3231210993633,2cyclictest3377993-21kworker/u8:0+flush-259:022:30:210
3231216993532,2cyclictest3289078-21kworker/u8:4+flush-259:020:45:472
3231216993532,2cyclictest3289078-21kworker/u8:4+events_unbound21:05:192
3231220993428,4cyclictest3502450-21latency_hist23:30:003
3231216993431,2cyclictest3559452-21kworker/u8:2+events_unbound00:35:192
3231216993431,2cyclictest3221187-21kworker/u8:1+flush-259:019:10:152
3231210993431,2cyclictest3247192-21kworker/u8:0+flush-259:019:25:200
3231210993430,3cyclictest3263328-21apt-get19:40:120
3231210993428,4cyclictest3305653-21diskstats20:20:130
3231216993330,2cyclictest3470539-21kworker/u8:2+events_unbound23:00:222
3231216993330,2cyclictest3221187-21kworker/u8:1+flush-259:019:55:152
3231210993330,2cyclictest3247192-21kworker/u8:0+flush-259:019:45:170
3231220993228,3cyclictest3527992-21kworker/u8:1+flush-259:000:15:003
3231216993229,2cyclictest3527992-21kworker/u8:1+events_unbound00:00:272
3231216993229,2cyclictest3367648-21kworker/u8:2+events_unbound22:05:202
3231216993229,2cyclictest3268241-21kworker/u8:2+flush-259:020:10:222
3231210993229,2cyclictest3289078-21kworker/u8:4+flush-259:020:45:220
3231210993229,2cyclictest3289078-21kworker/u8:4+flush-259:020:45:000
3231210993227,4cyclictest3304811-21apt-get20:20:010
3231220993124,5cyclictest3336252-21latency_hist20:50:013
3231216993126,2cyclictest3278570-21kworker/u8:3+events_unbound20:55:172
3231214993128,2cyclictest3377993-21kworker/u8:0+flush-259:021:45:001
3231210993128,2cyclictest3476583-21kworker/u8:3+events_unbound23:08:160
3231220993027,2cyclictest3221187-21kworker/u8:1+flush-259:019:45:013
3231220993025,4cyclictest335557-21systemd-journal22:50:153
3231216993026,3cyclictest3289078-21kworker/u8:4+flush-259:020:25:232
3231214993026,3cyclictest3289078-21kworker/u8:4+flush-259:021:00:211
3231216992926,2cyclictest3289078-21kworker/u8:4+events_unbound20:20:252
3231216992926,2cyclictest3247192-21kworker/u8:0+flush-259:019:40:202
3231214992925,3cyclictest3326189-21apt-get20:40:121
3231210992926,2cyclictest3470539-21kworker/u8:2+events_unbound23:20:240
3231210992926,2cyclictest3377993-21kworker/u8:0+flush-259:021:45:180
3231210992926,2cyclictest3278570-21kworker/u8:3+events_unbound20:50:230
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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