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2025-08-30 - 00:45

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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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 50 highest latencies:
System rackcslot8s.osadl.org (updated Fri Aug 29, 2025 12:46:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
114091670,32ptp4l0-21swapper/007:06:080
2120916444,10phc2sys0-21swapper/607:07:076
114091610,5ptp4l0-21swapper/407:06:454
114091600,29ptp4l0-21swapper/107:05:051
72472570,0sleep77251-21cpuspeed_turbos12:00:117
33142570,0sleep00-21swapper/011:55:000
1979625745,7sleep70-21swapper/707:06:397
1971025646,6sleep30-21swapper/307:05:313
114091530,5ptp4l0-21swapper/507:05:285
1986425039,6sleep20-21swapper/207:07:302
114091340,0ptp4l0-21swapper/412:25:134
114091330,1ptp4l23738-21hddtemp_smartct07:15:146
114091330,0ptp4l11210-21diskmemload12:27:496
114091330,0ptp4l0-21swapper/208:45:012
114091320,0ptp4l0-21swapper/212:10:142
114091310,0ptp4l0-21swapper/709:28:557
114091310,0ptp4l0-21swapper/610:56:006
114091310,0ptp4l0-21swapper/609:51:536
114091310,0ptp4l0-21swapper/209:34:112
114091300,8ptp4l0-21swapper/609:48:006
114091300,4ptp4l0-21swapper/612:19:466
114091300,4ptp4l0-21swapper/611:12:326
114091300,0ptp4l0-21swapper/710:54:137
114091300,0ptp4l0-21swapper/610:03:406
114091300,0ptp4l0-21swapper/210:51:322
114091300,0ptp4l0-21swapper/210:31:142
114091300,0ptp4l0-21swapper/110:55:201
114091290,4ptp4l0-21swapper/211:44:542
114091290,0ptp4l0-21swapper/610:32:006
114091290,0ptp4l0-21swapper/609:39:326
114091290,0ptp4l0-21swapper/609:31:436
114091290,0ptp4l0-21swapper/609:20:216
114091290,0ptp4l0-21swapper/212:36:262
114091290,0ptp4l0-21swapper/212:20:222
114091280,0ptp4l11210-21diskmemload10:10:056
114091280,0ptp4l0-21swapper/612:37:436
114091280,0ptp4l0-21swapper/611:19:246
114091280,0ptp4l0-21swapper/611:03:076
114091280,0ptp4l0-21swapper/610:37:416
114091280,0ptp4l0-21swapper/609:13:006
114091280,0ptp4l0-21swapper/511:58:145
114091280,0ptp4l0-21swapper/309:27:413
114091280,0ptp4l0-21swapper/212:31:132
114091280,0ptp4l0-21swapper/211:39:402
114091280,0ptp4l0-21swapper/210:13:172
114091280,0ptp4l0-21swapper/209:22:152
114091280,0ptp4l0-21swapper/109:11:141
114091270,3ptp4l0-21swapper/609:58:016
114091270,2ptp4l0-21swapper/612:24:376
114091270,0ptp4l0-21swapper/612:33:346
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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