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2024-07-27 - 07:19

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, 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 rackcslot8s.osadl.org (updated Sat Jul 27, 2024 00:46:07)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
125391640,5ptp4l0-21swapper/519:05:295
125391630,30ptp4l0-21swapper/119:08:341
1558926050,6sleep30-21swapper/319:08:573
1540425635,6sleep20-21swapper/219:06:302
1547925533,6sleep40-21swapper/419:07:284
125391550,18ptp4l0-21swapper/019:08:130
1551925342,6sleep60-21swapper/619:08:036
1543825038,7sleep70-21swapper/719:06:597
15988993225,4cyclictest1-21systemd19:44:554
125391320,0ptp4l0-21swapper/521:30:405
125391310,0ptp4l0-21swapper/523:08:255
125391310,0ptp4l0-21swapper/120:00:181
125391310,0ptp4l0-21swapper/119:35:151
125391300,3ptp4l0-21swapper/519:20:185
125391300,0ptp4l0-21swapper/521:53:185
125391300,0ptp4l0-21swapper/122:37:201
125391300,0ptp4l0-21swapper/121:13:001
125391300,0ptp4l0-21swapper/100:00:131
125391290,7ptp4l0-21swapper/123:51:551
125391290,0ptp4l0-21swapper/523:48:315
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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