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2025-12-03 - 15:11

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 Wed Dec 03, 2025 00:46:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
114091620,5ptp4l0-21swapper/519:09:545
1957126151,6sleep70-21swapper/719:06:507
62602600,1sleep09-21ksoftirqd/022:31:400
1978526050,6sleep60-21swapper/619:09:386
2120915837,6phc2sys0-21swapper/019:06:140
304812570,0sleep70-21swapper/722:20:177
1981925543,7sleep30-21swapper/319:09:593
114091550,13ptp4l0-21swapper/119:05:201
298812530,0sleep60-21swapper/621:35:136
1946324836,7sleep20-21swapper/219:05:332
1977424735,7sleep40-21swapper/419:09:274
114091380,0ptp4l0-21swapper/123:14:101
114091340,0ptp4l0-21swapper/123:35:011
114091320,0ptp4l18780-21ssh22:05:111
114091310,0ptp4l0-21swapper/522:47:455
114091310,0ptp4l0-21swapper/521:30:245
114091310,0ptp4l0-21swapper/121:47:461
114091300,0ptp4l9552-21ssh21:50:221
114091300,0ptp4l0-21swapper/522:00:305
114091300,0ptp4l0-21swapper/521:43:505
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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