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2025-12-10 - 01:57

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #3

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 rack5slot3s.osadl.org (updated Tue Dec 09, 2025 12:44:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
30932239164,24sleep10-21swapper/107:09:171
31402237162,24sleep30-21swapper/307:09:523
30712232163,55sleep00-21swapper/007:09:000
28242203165,25sleep20-21swapper/207:05:492
3170821790,3sleep0324799cyclictest09:25:160
1832321660,1sleep00-21swapper/012:35:150
3260991141,111cyclictest0-21swapper/211:39:032
324002530,4sleep123-21ksoftirqd/110:40:161
37032460,1sleep30-21swapper/310:50:013
242752420,5sleep3326499cyclictest10:20:263
3264993713,2cyclictest16392-21/usr/sbin/munin10:05:203
3247993711,12cyclictest0-21swapper/011:10:010
140642370,1sleep30-21swapper/311:10:243
326499365,11cyclictest0-21swapper/312:15:213
326499364,8cyclictest27098-40dnf10:29:333
326499363,16cyclictest8491-21grep08:30:253
3264993615,4cyclictest12607-21grep12:20:253
3264993613,2cyclictest21717-21/usr/sbin/munin07:50:153
3264993512,3cyclictest5392-21/usr/sbin/munin09:40:153
326499351,15cyclictest0-21swapper/309:45:273
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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