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2026-03-26 - 14:57

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 20 highest latencies:
System rack8slot4s.osadl.org (updated Thu Mar 26, 2026 12:44:47)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
843492228191,24sleep40-21swapper/407:07:534
843342227168,19sleep70-21swapper/707:07:407
843882223182,26sleep50-21swapper/507:08:265
842632218179,24sleep10-21swapper/107:06:371
844212217164,18sleep20-21swapper/207:08:552
843862214175,24sleep30-21swapper/307:08:243
842592212175,24sleep60-21swapper/607:06:346
845572209174,23sleep00-21swapper/007:09:580
1270842410,0sleep30-21swapper/308:20:143
8479999260,21cyclictest0-21swapper/507:40:115
8479999260,1cyclictest0-21swapper/507:55:015
8480499250,25cyclictest0-21swapper/712:40:007
8480299250,24cyclictest160230-21munin-run09:20:016
84796992523,1cyclictest0-21swapper/408:30:124
8479099250,1cyclictest160665-21apt-get09:20:122
8480499240,1cyclictest102563-21systemctl07:40:007
8480499240,1cyclictest102563-21systemctl07:40:007
8480499240,0cyclictest0-21swapper/712:10:127
8480299240,23cyclictest129230-21apt-get08:25:126
8480299240,23cyclictest0-21swapper/612:15:006
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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