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2025-03-22 - 16:42

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, 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 - 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 rack0slot7s.osadl.org (updated Sat Mar 22, 2025 00:43:46)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2146758213176,22sleep20-21swapper/219:05:472
2147032212473,21sleep30-21swapper/319:09:173
2146839211770,20sleep10-21swapper/119:06:511
2146903210477,19sleep00-21swapper/019:07:380
214723099260,25cyclictest0-21swapper/123:46:411
2147228992624,1cyclictest0-21swapper/019:31:240
214723499250,25cyclictest0-21swapper/223:38:052
214723499250,25cyclictest0-21swapper/221:11:072
214723099250,25cyclictest0-21swapper/121:14:301
214723099250,25cyclictest0-21swapper/119:37:371
214722899250,25cyclictest0-21swapper/023:16:290
214722899250,25cyclictest0-21swapper/022:15:080
214722899250,24cyclictest0-21swapper/000:19:150
214723699240,15cyclictest0-21swapper/319:53:093
214723099240,16cyclictest0-21swapper/123:14:041
214722899240,15cyclictest0-21swapper/021:45:350
2147228992211,10cyclictest0-21swapper/019:53:220
2147236992113,8cyclictest0-21swapper/323:40:083
214723499210,21cyclictest0-21swapper/221:04:292
214722899211,19cyclictest0-21swapper/022:19:590
2147236992011,3cyclictest0-21swapper/321:08:313
214723099201,1cyclictest0-21swapper/119:43:041
214723699190,3cyclictest0-21swapper/320:03:103
2147234991911,6cyclictest0-21swapper/221:50:122
2147234991910,0cyclictest0-21swapper/219:36:242
2147230991917,1cyclictest0-21swapper/120:31:531
214722899198,10cyclictest0-21swapper/019:42:090
214723499185,13cyclictest0-21swapper/219:40:122
214723099180,3cyclictest0-21swapper/121:08:161
214723099180,3cyclictest0-21swapper/100:04:271
214722899185,13cyclictest0-21swapper/023:33:240
2147228991815,2cyclictest1051-21snmpd20:40:180
214722899180,3cyclictest0-21swapper/020:28:170
214722899180,17cyclictest0-21swapper/020:03:310
214723699170,12cyclictest0-21swapper/319:27:513
2147234991714,2cyclictest1051-21snmpd23:31:392
214723499170,17cyclictest0-21swapper/223:02:562
214723499170,17cyclictest0-21swapper/221:15:192
214723099170,17cyclictest0-21swapper/122:30:421
214722899177,9cyclictest0-21swapper/000:07:390
2147228991714,2cyclictest1051-21snmpd21:16:120
214722899170,17cyclictest0-21swapper/023:11:310
214722899170,16cyclictest0-21swapper/022:32:000
214722899170,16cyclictest0-21swapper/021:06:490
214722899170,16cyclictest0-21swapper/020:46:240
214722899170,16cyclictest0-21swapper/000:34:100
2147236991613,2cyclictest1051-21snmpd20:36:183
214723699160,7cyclictest0-21swapper/319:48:493
214723699160,15cyclictest0-21swapper/321:12:363
2147234991614,1cyclictest1051-21snmpd20:13:382
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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