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2025-07-18 - 00:26

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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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 Jul 17, 2025 12:44:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2759911030,94ptp4l0-21swapper/107:07:501
2759911030,94ptp4l0-21swapper/107:07:501
76332670,0sleep70-21swapper/707:35:019
1920526554,9sleep50-21swapper/507:09:577
1920526554,9sleep50-21swapper/507:09:577
1920126552,10sleep40-21swapper/407:09:566
1920126552,10sleep40-21swapper/407:09:566
1897526553,10sleep70-21swapper/707:06:349
1897526553,10sleep70-21swapper/707:06:349
1908526456,6sleep110-21swapper/1107:08:143
1908526456,6sleep110-21swapper/1107:08:143
1900726453,9sleep00-21swapper/007:07:030
1900726453,9sleep00-21swapper/007:07:030
1919026251,9sleep60-21swapper/607:09:478
1919026251,9sleep60-21swapper/607:09:468
236922600,1sleep60-21swapper/608:35:188
1904526049,9sleep100-21swapper/1007:07:372
1904526049,9sleep100-21swapper/1007:07:372
1956499242,17cyclictest0-21swapper/409:05:016
1956499233,15cyclictest0-21swapper/412:15:006
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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