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2023-10-04 - 04:25

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #7

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 rack4slot7s.osadl.org (updated Wed Oct 04, 2023 00:43:28)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
286932462396,52sleep10-21swapper/119:06:301
285582458395,50sleep00-21swapper/019:05:120
163042500,3sleep1211rcuc/122:45:141
29159994610,22cyclictest14963-21seq19:55:011
29159994610,21cyclictest22915-21sed20:15:021
283212460,2chrt0-21swapper/121:54:411
2915999431,27cyclictest9770-21diskstats23:55:001
2915999431,26cyclictest24572-21kworker/u4:100:35:121
2915999425,29cyclictest0-21swapper/122:35:001
2915999422,26cyclictest15047-21sshd00:09:151
29159994210,24cyclictest22829-21snmpd00:15:031
2915999413,32cyclictest0-21swapper/120:35:001
2915999411,26cyclictest2150-21diskstats23:34:581
2915999410,26cyclictest7293-21perl19:35:021
2915999405,25cyclictest0-21swapper/119:29:571
2915999403,30cyclictest0-21swapper/119:19:531
2915999403,29cyclictest0-21swapper/123:49:551
2915999402,31cyclictest0-21swapper/119:44:561
2915999402,28cyclictest0-21swapper/122:00:001
2915999401,26cyclictest13284-21/usr/sbin/munin22:40:081
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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