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2026-03-26 - 02:50

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 Mar 25, 2026 12:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3165745994139,1cyclictest1105703-21kworker/1:0+pm10:12:271
3165741994038,1cyclictest3222848-21kworker/0:1+pm10:12:260
3165741993632,3cyclictest3311295-21apt-get09:30:120
3165745993228,3cyclictest3223046-21apt-get08:05:131
3165748993128,2cyclictest3227940-21kworker/u8:2+flush-259:009:50:252
3165748993127,3cyclictest3291183-21kworker/u8:4+events_unbound09:20:142
3165748993127,3cyclictest3181169-21kworker/u8:1+flush-259:007:35:252
3165745993127,3cyclictest3326756-21apt-get09:45:111
3165748992924,3cyclictest3503512-21kworker/u8:1+events_unbound12:35:192
3165745992924,4cyclictest3285576-21/usr/sbin/munin09:05:151
3165748992824,3cyclictest3291183-21kworker/u8:4+flush-259:009:10:192
3165751992723,3cyclictest3337043-21kworker/u8:4+flush-259:010:00:213
3165748992722,4cyclictest3181822-21apt-get07:25:092
3165741992722,4cyclictest3197260-21apt-get07:40:110
3165751992622,3cyclictest3181701-21gpgv07:25:003
3165748992622,3cyclictest3367808-21kworker/u8:0+flush-259:010:50:212
3165748992622,3cyclictest3337043-21kworker/u8:4+events_unbound11:10:102
3165748992621,4cyclictest3254179-21gpgv08:35:012
3165748992518,5cyclictest252-21systemd-journal12:09:592
3165745992520,4cyclictest3270164-21apt-get08:50:131
3165751992416,6cyclictest3487553-21latency_hist12:20:003
3165745992420,3cyclictest3482670-21apt-get12:15:111
3165745992420,3cyclictest3394354-21/usr/sbin/munin10:50:151
3165745992417,5cyclictest252-21systemd-journal11:15:001
3165751992317,4cyclictest3446040-21/usr/sbin/munin11:40:183
3165751992316,5cyclictest3388025-21ntpq10:40:203
3165745992320,2cyclictest0-21swapper/112:40:011
3165745992319,3cyclictest3337077-21apt-get09:55:091
3165745992319,3cyclictest3337077-21apt-get09:55:091
3165741992317,4cyclictest3347088-21latency_hist10:05:000
3165748992219,2cyclictest3440834-21kworker/u8:4+events_unbound12:00:232
3165748992218,3cyclictest3357200-21kworker/u8:2+events_unbound10:15:142
3165748992218,3cyclictest3217850-21kworker/u8:1+flush-259:008:30:002
3165748992218,2cyclictest3367808-21kworker/u8:0+flush-259:010:30:152
3165748992216,4cyclictest3311035-21latency_hist09:30:002
3165745992219,2cyclictest3217850-21kworker/u8:1+flush-259:008:30:251
3165741992217,3cyclictest3337043-21kworker/u8:4+flush-259:010:25:000
3165751992117,3cyclictest3321348-21kworker/u8:1+flush-259:010:10:253
3165748992117,3cyclictest3186951-21kworker/u8:0+events_unbound07:45:122
3165748992117,3cyclictest3112954-21kworker/u8:1+events_unbound07:14:242
3165748992115,5cyclictest3456819-21apt-get11:50:122
3165751992016,2cyclictest0-21swapper/310:10:003
3165751992014,4cyclictest3451187-21kworker/u8:2+flush-259:011:45:163
3165748992017,2cyclictest3477229-21kworker/u8:2+events_unbound12:10:232
3165748992017,2cyclictest3337043-21kworker/u8:4+flush-259:011:00:232
3165748992017,2cyclictest3227940-21kworker/u8:2+events_unbound08:45:142
3165748992015,3cyclictest3409825-21apt-get11:05:112
3165741992014,4cyclictest3165959-21apt-get07:10:110
3165751991916,2cyclictest490-21dbus-daemon08:35:013
3165748991916,2cyclictest3430952-21irqcore11:25:142
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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