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2026-04-24 - 04:24

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #8, 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.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack8slot4s.osadl.org (updated Thu Apr 23, 2026 12:44:50)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
40309182249183,23sleep10-21swapper/107:07:241
40310242222187,23sleep60-21swapper/607:08:596
40307992220180,26sleep30-21swapper/307:05:413
40309192218160,18sleep20-21swapper/207:07:252
40310072217164,17sleep70-21swapper/707:08:447
40308052216162,18sleep00-21swapper/007:05:470
40308372212181,20sleep50-21swapper/507:06:165
40308652207171,23sleep40-21swapper/407:06:384
403132599290,26cyclictest4152902-21cron10:34:597
4031312992823,4cyclictest0-21swapper/112:40:011
4031312992711,15cyclictest0-21swapper/110:05:221
4031324992622,3cyclictest0-21swapper/607:35:016
403132499260,25cyclictest0-21swapper/608:15:016
403132499260,22cyclictest4041248-21apt-get07:25:126
403131399260,24cyclictest19-1pr/legacy10:55:012
403132599250,9cyclictest0-21swapper/707:14:407
403132599250,24cyclictest0-21swapper/708:55:127
403132599250,21cyclictest4179470-21apt11:20:017
4031324992522,2cyclictest2211502-21systemd-journal09:59:596
403132199250,24cyclictest4149989-21perf10:30:005
4031319992524,1cyclictest0-21swapper/410:50:114
4031315992523,1cyclictest0-21swapper/312:10:013
4031315992521,3cyclictest4132283-21munin-run10:00:003
4031313992521,3cyclictest4167718-21sendmail11:00:012
403131399250,24cyclictest0-21swapper/210:15:122
4031312992522,2cyclictest4097354-21taskset09:00:111
4031312992518,5cyclictest9083-21awk12:00:011
4031312992515,7cyclictest4105753-21basename09:15:011
4031309992523,1cyclictest0-21swapper/009:35:180
4031309992522,2cyclictest4194244-21perf11:45:010
403130999250,24cyclictest4072030-21ntpq08:15:190
403132599240,23cyclictest4170638-21sh11:05:017
4031324992421,2cyclictest0-21swapper/608:20:006
4031324992420,1cyclictest3620-21apt-get11:50:116
4031321992422,1cyclictest4044191-21apt-get07:30:135
4031321992422,1cyclictest0-21swapper/511:55:005
4031321992420,3cyclictest4129347-21munin-run09:55:015
403132199240,23cyclictest4158866-21dump-pmu-power10:44:595
403132199240,23cyclictest4114603-21perf09:30:005
403131999240,23cyclictest12044-21munin-run12:05:004
403131599240,22cyclictest0-21swapper/308:55:183
403131599240,0cyclictest0-21swapper/310:10:103
4031313992422,2cyclictest4188325-21idleruntime-cro11:34:592
403131399240,3cyclictest4170652-21grep11:05:002
403131399240,23cyclictest2157451-21rs:main2
403131399240,22cyclictest19-1pr/legacy12:00:012
403131399240,1cyclictest0-21swapper/208:25:012
4031312992423,1cyclictest0-21swapper/110:10:111
403131299240,23cyclictest4095769-21ntp_states08:55:191
4031309992421,3cyclictest4079413-21sed08:30:020
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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