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2024-09-12 - 08:27

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, 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 rack0slot8s.osadl.org (updated Thu Sep 12, 2024 00:44:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
275991820,58ptp4l0-21swapper/119:05:211
685826555,8sleep00-21swapper/019:05:110
1002726452,10sleep50-21swapper/519:08:167
685626352,9sleep110-21swapper/1119:05:093
685226250,10sleep70-21swapper/719:05:069
685126250,10sleep60-21swapper/619:05:058
998026049,9sleep100-21swapper/1019:07:332
984125947,10sleep40-21swapper/419:05:396
155382510,1sleep11020-21runrttasks19:55:161
1056299212,6cyclictest0-21swapper/419:20:016
1056299212,14cyclictest0-21swapper/420:30:006
1059499181,3cyclictest0-21swapper/1020:30:162
1057999180,17cyclictest0-21swapper/722:45:169
1055799183,9cyclictest0-21swapper/322:20:005
1055399183,10cyclictest0-21swapper/223:50:014
1055399183,10cyclictest0-21swapper/223:50:014
1055399180,12cyclictest14690-21munin-node19:15:014
275991170,0ptp4l0-21swapper/123:45:201
275991170,0ptp4l0-21swapper/123:45:191
1057399173,8cyclictest0-21swapper/600:00:018
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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