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2024-07-25 - 08:19

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #5

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 rackeslot5s.osadl.org (updated Thu Jul 25, 2024 00:44:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2488992623,2cyclictest24614-21rm22:45:052
248399260,1cyclictest299-21systemd-journal21:30:010
2490992523,1cyclictest0-21swapper/321:50:513
249099250,2cyclictest28511-21diskmemload21:18:493
249099250,24cyclictest28511-21diskmemload21:43:463
2488992523,0cyclictest0-21swapper/221:20:422
248899250,0cyclictest0-21swapper/222:55:252
248399250,24cyclictest28511-21diskmemload00:39:450
248399250,24cyclictest0-21swapper/021:54:510
2490992423,0cyclictest0-21swapper/322:52:273
2490992422,1cyclictest0-21swapper/322:37:423
249099240,24cyclictest0-21swapper/322:29:343
249099240,24cyclictest0-21swapper/321:34:213
249099240,23cyclictest28511-21diskmemload23:21:513
249099240,23cyclictest0-21swapper/321:55:043
248899240,23cyclictest2080-21ssh00:05:142
248899240,1cyclictest5455-21sh22:25:242
248899240,0cyclictest0-21swapper/222:08:452
2484992422,1cyclictest299-21systemd-journal22:10:011
248499240,24cyclictest28511-21diskmemload00:30:381
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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