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2024-11-23 - 17:08

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 Nov 23, 2024 12:46:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
132091630,31ptp4l0-21swapper/007:08:430
132091610,30ptp4l0-21swapper/107:05:221
132091600,5ptp4l0-21swapper/507:05:385
2957825947,7sleep30-21swapper/307:09:193
283562590,0sleep30-21swapper/310:00:113
2948625846,7sleep20-21swapper/207:08:052
132091580,6ptp4l0-21swapper/407:09:264
2772525342,7sleep70-21swapper/707:05:057
2929024635,6sleep60-21swapper/607:05:376
132091340,3ptp4l0-21swapper/009:17:500
132091330,0ptp4l0-21swapper/210:17:152
132091310,4ptp4l0-21swapper/412:29:554
132091310,0ptp4l0-21swapper/112:13:001
132091310,0ptp4l0-21swapper/111:08:381
132091310,0ptp4l0-21swapper/011:10:080
132091310,0ptp4l0-21swapper/009:42:240
132091300,1ptp4l29428-21ssh11:25:220
132091300,0ptp4l0-21swapper/512:10:135
132091300,0ptp4l0-21swapper/412:04:174
132091300,0ptp4l0-21swapper/410:50:194
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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