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2025-05-05 - 00:15

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #8, 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 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 rack8slot4s.osadl.org (updated Sun May 04, 2025 12:44:47)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3389422231166,22sleep20-21swapper/207:07:422
3390472227168,19sleep50-21swapper/507:09:135
3388792226167,46sleep40-21swapper/407:06:474
3389432225174,40sleep30-21swapper/307:07:433
3389292224192,20sleep00-21swapper/007:07:300
3389912219162,45sleep60-21swapper/607:08:266
3390312215182,21sleep70-21swapper/707:08:587
3388472205178,17sleep10-21swapper/107:06:201
3558712590,1sleep10-21swapper/107:35:191
33935499324,1cyclictest0-21swapper/712:20:007
339348992721,5cyclictest454993-21awk10:30:005
339346992726,1cyclictest0-21swapper/411:15:004
33934899250,22cyclictest0-21swapper/508:20:145
339346992523,1cyclictest0-21swapper/409:54:594
33934699250,24cyclictest0-21swapper/412:00:164
33934399250,24cyclictest475276-21idleruntime-cro11:05:003
33934399250,24cyclictest0-21swapper/309:30:003
33934199250,24cyclictest483853-21basename11:20:002
33934199250,24cyclictest363064-21idleruntime-cro07:50:012
33933699250,24cyclictest510492-21apt-get12:05:141
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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