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2026-06-19 - 22:30

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #b, slot #8

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 rackbslot8s (updated Fri Jun 19, 2026 12:44:17)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3251632119104,10sleep10-21swapper/107:09:311
325180211499,10sleep00-21swapper/007:09:460
323077211498,10sleep60-21swapper/607:05:046
324923211399,9sleep50-21swapper/507:06:085
324920211398,10sleep20-21swapper/207:06:052
323084211197,9sleep40-21swapper/407:05:104
325084211095,10sleep70-21swapper/707:08:267
324948210994,10sleep30-21swapper/307:06:303
325446991030,100cyclictest0-21swapper/410:43:154
325457991020,100cyclictest0-21swapper/712:33:387
325451991020,100cyclictest0-21swapper/510:48:175
325451991020,100cyclictest0-21swapper/510:48:165
3254469910296,3cyclictest553-21snmpd10:59:414
325446991020,101cyclictest0-21swapper/409:42:024
3254389910299,3cyclictest553-21snmpd10:01:302
325438991020,100cyclictest0-21swapper/211:58:122
325438991020,0cyclictest0-21swapper/209:00:252
325432991020,102cyclictest0-21swapper/008:13:560
325457991010,99cyclictest0-21swapper/708:38:417
325457991010,101cyclictest0-21swapper/710:59:387
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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