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2026-04-15 - 21:19

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, slot #7

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 rackcslot7s.osadl.org (updated Wed Apr 15, 2026 12:44:44)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
317727924640,10sleep00-21swapper/007:05:120
317757422310,22sleep234-21ksoftirqd/207:05:182
323494021370,3sleep23233825-21/usr/sbin/munin09:45:232
322507621140,2sleep33056-21PK-Backend09:20:143
327652221080,4sleep33056-21PK-Backend11:45:023
324351121070,3sleep20-21swapper/210:10:202
322925321010,3sleep20-21swapper/209:30:182
317820727238,9sleep10-21swapper/107:07:031
31824992640,3sleep33182498-21systemd-run07:20:003
317824626243,13sleep30-21swapper/307:07:343
32245862530,4sleep20-21swapper/209:20:012
139099390,3rtkit-daemon0-21swapper/207:42:362
32505752380,3sleep10-21swapper/110:30:211
317858199301,3cyclictest26-21ksoftirqd/112:35:021
3178581992716,3cyclictest26-21ksoftirqd/112:08:231
32394432260,9sleep234-21ksoftirqd/210:00:142
317858199260,6cyclictest3254531-21apt-get10:43:351
139099260,18rtkit-daemon3056-21PK-Backend10:51:523
139099260,17rtkit-daemon0-21swapper/309:45:213
317858199252,4cyclictest26-21ksoftirqd/110:20:001
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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