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2026-06-25 - 16:29

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 Thu Jun 25, 2026 12:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
4175247995751,4cyclictest158086-21latency_hist10:00:000
4175254995450,3cyclictest190167-21kworker/u8:3+events_unbound11:50:012
4175257994743,3cyclictest4180510-21gpgv07:15:003
4175252994741,4cyclictest4116372-21kworker/u8:0+flush-259:007:25:001
4175257994336,5cyclictest303624-21latency_hist12:20:003
4175254994338,3cyclictest4185982-21latency_hist07:20:022
4175252994237,4cyclictest126962-21apt-get09:30:121
4175252994135,4cyclictest241109-21apt-get11:19:001
4175254993530,3cyclictest131807-21latency_hist09:35:012
4175247993327,4cyclictest251634-21latency_hist11:30:010
4175254993229,2cyclictest158319-21kworker/u8:4+events_unbound10:05:112
4175254993226,5cyclictest307884-21ntpq12:20:212
4175252993227,3cyclictest184627-21/usr/sbin/munin10:25:141
4175247993227,4cyclictest73819-21ntpq08:35:200
4175254993128,2cyclictest16928-21kworker/u8:0+flush-259:007:50:202
4175254993127,3cyclictest85636-21kworker/u8:1+events_unbound09:39:122
4175252993128,2cyclictest85636-21kworker/u8:1+flush-259:009:05:161
4175257993023,5cyclictest324269-21latency_hist12:40:003
4175252993026,3cyclictest13042-21/usr/sbin/munin07:40:161
4175252993023,5cyclictest68648-21ntpq08:30:211
4175247993026,3cyclictest335557-21systemd-journal08:45:000
4175247993025,4cyclictest152025-21ntpq09:50:200
4175254992926,2cyclictest84536-21kworker/u8:0+events_unbound09:10:002
4175254992925,3cyclictest307857-21kworker/u8:3+events_unbound12:26:122
4175254992924,4cyclictest184394-21latency_hist10:25:012
4175247992925,3cyclictest335557-21systemd-journal10:50:000
4175247992925,3cyclictest262215-21apt-get11:40:110
4175257992822,4cyclictest293298-21diskstats12:10:123
4175254992825,2cyclictest16928-21kworker/u8:0+events_unbound08:23:132
4175254992824,3cyclictest18159-21kworker/u8:1+events_unbound08:12:142
4175252992824,3cyclictest18159-21kworker/u8:1+events_unbound08:27:121
4175252992824,3cyclictest18159-21kworker/u8:1+events_unbound08:27:121
4175254992724,2cyclictest85636-21kworker/u8:1+events_unbound09:12:122
4175254992723,3cyclictest38841-21apt-get08:05:112
4175254992721,4cyclictest7627-21latency_hist07:35:002
4175252992723,3cyclictest85636-21kworker/u8:1+flush-259:009:50:221
4175252992721,4cyclictest6751-21ntpq07:30:201
4175254992623,2cyclictest1083568-21kworker/u8:3+events_unbound07:35:132
4175252992622,3cyclictest1083568-21kworker/u8:3+events_unbound08:11:121
4175247992622,3cyclictest131808-21apt-get09:35:030
4175257992519,4cyclictest313896-21latency_hist12:30:003
4175254992521,3cyclictest18159-21kworker/u8:1+events_unbound07:47:112
4175252992522,2cyclictest121574-21kworker/u8:0+events_unbound10:07:121
4175252992521,3cyclictest16928-21kworker/u8:0+events_unbound08:22:121
4175247992521,3cyclictest183465-21kworker/u8:2+flush-259:011:10:000
4175247992521,3cyclictest168596-21gpgv10:10:000
4175247992520,4cyclictest231110-21apt-get11:10:110
4175247992520,3cyclictest38571-21latency_hist08:05:000
4175247992519,4cyclictest335557-21systemd-journal09:20:110
4175257992418,4cyclictest94909-21ntpq08:55:213
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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