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2025-12-25 - 18:32

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 Dec 25, 2025 12:44:43)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
30006932233176,19sleep70-21swapper/707:09:217
30005682227172,43sleep40-21swapper/407:07:344
30004662221184,24sleep50-21swapper/507:06:065
30004402220163,18sleep60-21swapper/607:05:436
30004542213175,25sleep20-21swapper/207:05:542
30005262209175,22sleep00-21swapper/007:06:570
30006662208175,21sleep10-21swapper/107:08:591
30005852207172,22sleep30-21swapper/307:07:493
31703972510,0sleep40-21swapper/412:00:234
300096899260,26cyclictest3013278-21perf07:30:000
300096899260,22cyclictest3151665-21apt-get11:30:130
300097499250,24cyclictest3165505-21cron11:55:002
300097199250,24cyclictest0-21swapper/110:45:111
3000968992519,5cyclictest363-21systemd-journal09:05:000
3000968992516,4cyclictest0-21swapper/011:10:110
300096899250,24cyclictest3185522-21sh12:30:000
300096899250,21cyclictest0-21swapper/007:30:150
3000982992423,1cyclictest2986029-21munin-node07:15:005
300098099240,3cyclictest363-21systemd-journal08:00:004
3000977992422,1cyclictest0-21swapper/309:35:113
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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