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2023-09-24 - 01:30

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 
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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 rackcslot8s.osadl.org (updated Sat Sep 23, 2023 12:46:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
125391640,5ptp4l0-21swapper/107:05:221
87752630,0sleep60-21swapper/610:25:306
125391630,30ptp4l0-21swapper/007:07:130
2339926140,6sleep20-21swapper/207:05:102
125391610,6ptp4l0-21swapper/407:07:324
2510625543,7sleep50-21swapper/507:07:295
2500825444,6sleep70-21swapper/707:06:117
2497225038,7sleep60-21swapper/607:05:466
2504224736,6sleep30-21swapper/307:06:403
125391320,0ptp4l0-21swapper/412:39:174
125391320,0ptp4l0-21swapper/111:00:281
125391320,0ptp4l0-21swapper/110:24:251
125391310,1ptp4l8107-21ssh11:10:204
125391310,0ptp4l0-21swapper/112:34:001
125391310,0ptp4l0-21swapper/112:34:001
125391300,0ptp4l0-21swapper/510:40:015
125391300,0ptp4l0-21swapper/509:42:085
125391300,0ptp4l0-21swapper/509:42:075
125391300,0ptp4l0-21swapper/408:50:264
125391300,0ptp4l0-21swapper/111:27:431
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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