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2024-07-27 - 14:26

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, slot #3

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 50 highest latencies:
System rackcslot3s.osadl.org (updated Sat Jul 27, 2024 00:50:27)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
13882597579,12sleep60-21swapper/619:06:436
13182500479,15sleep20-21swapper/219:05:432
13612462443,13sleep00-21swapper/019:06:210
14392458437,15sleep30-21swapper/319:07:283
15162441419,15sleep40-21swapper/419:08:334
15192426404,15sleep70-21swapper/719:08:367
16052423399,18sleep10-21swapper/119:09:511
15062337312,19sleep50-21swapper/519:08:275
2064997170,0cyclictest14974-21grep19:35:147
2063995934,1cyclictest17520-21cat20:45:326
2061995957,1cyclictest21286-21tr20:55:144
2060995956,1cyclictest21629-21tr23:10:133
2060995553,1cyclictest1106-21tr23:35:113
2060995552,1cyclictest15815-21sh23:00:003
169622540,0sleep00-21swapper/020:45:210
2059995351,1cyclictest22756-21timerandwakeup23:10:322
2060994745,1cyclictest11747-21tr20:35:123
2063994544,0cyclictest26418-21tr23:20:146
2064994443,0cyclictest25421-21latency_hist21:05:017
2059994442,1cyclictest10546-21grep21:40:132
2058994442,1cyclictest4585-21tr22:35:191
2058994442,1cyclictest4585-21tr22:35:191
2057994341,1cyclictest21285-21grep20:55:140
2059994240,1cyclictest23648-21cpuspeed_turbos21:00:162
206499410,22cyclictest0-21swapper/700:20:337
2062994139,1cyclictest18380-21uname21:55:235
2062994139,1cyclictest15868-21tr00:05:125
2060994116,23cyclictest24021-21tr23:15:123
2063994038,1cyclictest6934-21grep20:25:126
206099407,18cyclictest0-21swapper/300:34:363
2059994038,1cyclictest18939-21cpuspeed_turbos20:50:142
2057994038,1cyclictest6913-21tr22:40:130
2064993924,14cyclictest20793-21cpuspeed_turbos00:15:127
2064993912,10cyclictest0-21swapper/722:10:187
206499391,18cyclictest0-21swapper/721:38:147
2062993916,12cyclictest0-21swapper/523:33:445
2061993936,2cyclictest31003-21head22:20:394
206099395,21cyclictest0-21swapper/300:15:073
205999390,38cyclictest9886-21apt21:40:012
2058993914,24cyclictest18083-21grep23:00:361
2057993937,1cyclictest19605-21latency_hist22:00:010
2063993836,1cyclictest9353-21wc21:35:346
2063993836,1cyclictest11930-21grep21:40:386
2063993836,1cyclictest11312-21wc19:25:426
206399380,2cyclictest25420-21grep23:15:366
206399380,1cyclictest0-21swapper/621:20:336
206299389,21cyclictest0-21swapper/523:40:335
2061993820,17cyclictest5701-21tr21:30:164
206199380,1cyclictest2270-21grep20:15:164
2060993836,1cyclictest8181-21grep21:35:133
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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