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2026-05-22 - 17:33

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #9, 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 here to display the system's profile data or here to proceed to next system.
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 rack9slot4s (updated Fri May 22, 2026 00:59:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
314729912691241,22cyclictest878-21latency_hist19:30:001
311542584537,32sleep00-21swapper/019:22:120
311022526471,40sleep10-21swapper/119:21:431
3147199125103,15cyclictest982-21latency_hist19:30:000
285212690,3sleep10-21swapper/120:40:141
272312660,2sleep10-21swapper/120:35:261
3147299573,18cyclictest32184-21diskstats20:50:141
3147299539,8cyclictest7608-21idleruntime21:10:191
3147299529,5cyclictest40250irq/92-i91521:05:281
3147299524,16cyclictest2292-21iostat_ios19:30:201
31472995213,5cyclictest0-21swapper/121:54:341
31472995116,6cyclictest31162-21sort23:40:011
3147299502,8cyclictest22030-21irqstats00:40:191
3147299493,7cyclictest1888-21users23:45:291
3147299491,14cyclictest2531-21/usr/sbin/munin23:50:301
3147299482,8cyclictest19745-21munin-run23:10:011
3147299482,11cyclictest10138-21ntp_states19:50:231
3147299468,6cyclictest0-21swapper/121:30:011
3147299467,7cyclictest14232-21fschecks_count00:20:151
3147299462,9cyclictest7284-21latency_hist19:45:001
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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