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2026-06-29 - 20:48

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 Jun 29, 2026 12:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
177801994945,3cyclictest75-21kswapd012:25:251
177801993934,3cyclictest219163-21apt-get07:50:101
177799993834,3cyclictest442171-21apt-get11:25:020
177799993834,2cyclictest211rcuc/012:15:000
177799993834,2cyclictest211rcuc/012:15:000
177805993730,5cyclictest468691-21cp11:50:002
177805993730,5cyclictest468691-21cp11:50:002
177801993734,2cyclictest188083-21kworker/u8:2+flush-259:008:00:161
177801993731,4cyclictest251088-21latency_hist08:20:001
177799993734,2cyclictest436915-21kworker/u8:0+events_unbound12:15:180
177809993630,4cyclictest266905-21apt-get08:35:123
177805993530,3cyclictest505171-21/usr/sbin/munin12:25:142
177801993530,3cyclictest436915-21kworker/u8:0+flush-259:011:25:001
177809993429,4cyclictest463197-21latency_hist11:45:003
177809993429,3cyclictest380487-21latency_hist10:25:013
177805993428,4cyclictest318176-21awk09:25:002
177801993428,4cyclictest479127-21latency_hist12:00:001
177799993430,3cyclictest354904-21kworker/u8:4+flush-259:010:45:010
177809993327,4cyclictest442771-21cat11:25:013
177809993326,5cyclictest208626-21latency_hist07:40:013
177805993229,2cyclictest75-21kswapd012:30:112
177805993227,3cyclictest359859-21latency_hist10:05:012
177801993227,3cyclictest335557-21systemd-journal12:15:001
177801993227,3cyclictest335557-21systemd-journal12:15:001
177799993227,4cyclictest224038-21apt-get07:55:010
177805993125,4cyclictest335557-21systemd-journal09:35:462
177805993125,4cyclictest240195-40mandb08:09:272
177799993127,3cyclictest335557-21systemd-journal08:15:010
177805993027,2cyclictest271799-21kworker/u8:0+flush-259:008:50:002
177805993024,4cyclictest207728-21ntpq07:35:222
177799993028,1cyclictest1-21systemd12:24:400
177799993025,4cyclictest335557-21systemd-journal08:05:000
177805992926,2cyclictest344614-21apt-get09:50:122
177805992922,5cyclictest380906-21diskstats10:25:142
177799992925,3cyclictest224689-21kworker/u8:3+flush-259:009:00:250
177805992824,3cyclictest375318-21latency_hist10:20:012
177805992823,4cyclictest335557-21systemd-journal07:25:012
177801992724,2cyclictest442382-21kworker/u8:1+flush-259:011:25:151
177801992724,2cyclictest380712-21kworker/u8:1+flush-259:010:25:211
177801992724,2cyclictest354904-21kworker/u8:4+flush-259:010:30:171
177801992723,3cyclictest354904-21kworker/u8:4+flush-259:010:15:011
177801992723,3cyclictest182803-21kworker/u8:0+flush-259:007:55:171
177801992722,3cyclictest183139-21/usr/sbin/munin07:15:171
177801992721,4cyclictest335557-21systemd-journal07:23:401
177801992623,2cyclictest188083-21kworker/u8:2+flush-259:007:30:161
177801992622,3cyclictest323530-21kworker/u8:2+flush-259:009:50:001
177801992621,4cyclictest365059-21kworker/u8:2+events_unbound10:50:221
177801992619,4cyclictest297502-21latency_hist09:05:001
177799992622,3cyclictest365059-21kworker/u8:2+events_unbound10:45:250
177799992622,3cyclictest335557-21systemd-journal08:09:260
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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