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2025-02-15 - 10:14

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 Feb 15, 2025 00:46:12)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
132091610,29ptp4l0-21swapper/019:09:010
1654826049,6sleep60-21swapper/619:08:076
132091600,29ptp4l0-21swapper/119:07:461
132091570,5ptp4l0-21swapper/419:07:304
1667225646,6sleep20-21swapper/219:09:402
1643125533,7sleep70-21swapper/719:06:317
1647425232,7sleep50-21swapper/519:07:115
297092510,0sleep40-21swapper/422:46:554
256472490,1sleep21228-21runrttasks22:38:292
1660024937,7sleep30-21swapper/319:08:443
132091340,0ptp4l0-21swapper/421:49:484
132091320,0ptp4l0-21swapper/423:47:574
132091320,0ptp4l0-21swapper/422:28:244
132091310,3ptp4l561ktimersoftd/523:30:245
132091310,1ptp4l10902-21ssh00:07:060
132091310,0ptp4l0-21swapper/522:30:015
132091310,0ptp4l0-21swapper/500:20:145
132091300,0ptp4l0-21swapper/721:26:457
132091300,0ptp4l0-21swapper/423:25:284
132091300,0ptp4l0-21swapper/423:01:454
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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