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2026-06-08 - 18:16

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #5

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 rackeslot5s.osadl.org (updated Mon Jun 08, 2026 12:44:23)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2695599260,26cyclictest0-21swapper/012:25:450
26964992523,1cyclictest32532-21ssh11:20:523
2696499250,24cyclictest21138-21diskmemload11:08:313
2696499250,24cyclictest19870-21ssh09:39:163
26958992523,1cyclictest21138-21diskmemload10:34:131
2695899250,24cyclictest21138-21diskmemload11:59:111
2695899250,24cyclictest0-21swapper/112:31:141
2695599250,24cyclictest3863-21processes10:54:200
26964992423,1cyclictest21138-21diskmemload10:47:073
2696499240,24cyclictest0-21swapper/309:50:503
2696499240,23cyclictest5622-21sh09:55:493
26963992422,1cyclictest8449-21df_inode09:29:112
26963992422,1cyclictest28580-21sh11:18:042
26963992422,1cyclictest0-21swapper/211:34:202
26963992419,4cyclictest1457-21ssh11:22:572
2696399240,23cyclictest21138-21diskmemload11:52:252
2696399240,1cyclictest10799-21sh10:00:292
26958992422,1cyclictest0-21swapper/110:55:521
26958992421,2cyclictest31872-21basename12:20:001
2695899240,24cyclictest0-21swapper/111:03:171
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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