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2026-11-10 - 23:09

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #b, slot #2

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 rackbslot2s.osadl.org (updated Tue Nov 10, 2026 12:45:21)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
10198699592,56cyclictest0-21swapper/310:48:207
10198699572,48cyclictest0-21swapper/310:14:247
17424725310,9sleep120-21swapper/1209:22:424
17424725310,9sleep120-21swapper/1209:22:414
10199599531,45cyclictest0-21swapper/511:20:209
10198699533,17cyclictest0-21swapper/310:40:377
10198699523,42cyclictest0-21swapper/312:39:557
10198699522,40cyclictest0-21swapper/312:01:027
10198699522,40cyclictest0-21swapper/312:01:017
10198699512,40cyclictest0-21swapper/310:00:187
10198699512,16cyclictest0-21swapper/310:35:007
10198699512,16cyclictest0-21swapper/309:54:347
4084342504,14sleep70-21swapper/711:07:1811
4084342504,14sleep70-21swapper/711:07:1811
10199599501,40cyclictest0-21swapper/509:22:069
10199599501,40cyclictest0-21swapper/509:22:059
10198699503,40cyclictest0-21swapper/311:41:077
10198699503,39cyclictest0-21swapper/311:30:257
3633712494,4sleep120-21swapper/1210:46:494
10198699493,40cyclictest0-21swapper/309:26:377
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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