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2024-04-24 - 12:52

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #b, slot #6

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 rackbslot6s.osadl.org (updated Wed Apr 24, 2024 00:43:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
32725911760,5ptp4l241ktimersoftd/100:12:081
4382911590,9getstats342299cyclictest05:22:501
4382911030,9getstats342299cyclictest05:32:501
4382911030,8getstats342299cyclictest05:37:501
3272591970,1ptp4l241ktimersoftd/103:48:041
3272591950,1ptp4l241ktimersoftd/103:01:261
3272591910,1ptp4l241ktimersoftd/100:54:301
3272591830,23ptp4l30884-21kworker/1:205:27:571
3272591810,1ptp4l241ktimersoftd/104:48:331
3272591800,20ptp4l31286-21kworker/1:103:12:391
3272591800,20ptp4l31286-21kworker/1:103:12:391
3272591780,3ptp4l32120-21kworker/1:201:01:071
3272591780,20ptp4l19774-21kworker/1:002:20:091
3272591780,1ptp4l241ktimersoftd/103:46:311
3272591770,20ptp4l19774-21kworker/1:002:36:581
3272591740,3ptp4l31286-21kworker/1:104:33:571
3272591730,20ptp4l31286-21kworker/1:103:28:531
3272591650,1ptp4l241ktimersoftd/103:09:171
3272591640,3ptp4l31286-21kworker/1:104:07:341
3272591640,1ptp4l241ktimersoftd/105:04:131
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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