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2026-01-05 - 02:23

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 Sun Jan 04, 2026 12:44:18)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
4551892130114,10sleep50-21swapper/507:06:555
4551742130114,10sleep10-21swapper/107:06:431
4552652128113,10sleep70-21swapper/707:08:017
4553612127112,10sleep00-21swapper/007:09:230
4552982127113,9sleep40-21swapper/407:08:304
4551492123109,9sleep30-21swapper/307:06:213
4551482123108,9sleep20-21swapper/207:06:202
4550862121105,10sleep60-21swapper/607:05:286
4556429910299,3cyclictest556-21snmpd10:12:560
4556629910199,2cyclictest556-21snmpd10:13:055
4556629910198,2cyclictest556-21snmpd11:39:175
4556629910198,2cyclictest556-21snmpd09:16:265
4556559910199,2cyclictest556-21snmpd11:35:323
4556559910199,2cyclictest556-21snmpd09:18:073
4556559910199,2cyclictest556-21snmpd07:20:363
4556559910198,3cyclictest556-21snmpd11:30:373
4556559910198,2cyclictest556-21snmpd09:44:403
4556519910199,2cyclictest556-21snmpd11:24:372
4556519910199,2cyclictest556-21snmpd08:38:052
455651991010,99cyclictest0-21swapper/208:04:102
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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