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2026-06-18 - 13:12

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, 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 50 highest latencies:
System rack0slot5s.osadl.org (updated Thu Jun 18, 2026 00:45:24)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
981042393368,16sleep00-21swapper/019:09:170
980332390365,17sleep20-21swapper/219:08:158
979332383358,17sleep110-21swapper/1119:06:473
978902357311,16sleep40-21swapper/419:06:0710
978842354310,16sleep150-21swapper/1519:06:037
980962352306,15sleep90-21swapper/919:09:1015
981262347321,17sleep30-21swapper/319:09:379
980002345321,16sleep70-21swapper/719:07:4713
979532345318,17sleep140-21swapper/1419:07:076
980922342315,17sleep50-21swapper/519:09:0511
980822342316,17sleep130-21swapper/1319:08:575
980032342318,16sleep100-21swapper/1019:07:502
979682342315,17sleep120-21swapper/1219:07:204
979472342319,15sleep80-21swapper/819:07:0014
979622341316,16sleep60-21swapper/619:07:1412
978872339315,16sleep10-21swapper/119:06:041
98539994140,1cyclictest1612-21snmpd19:17:214
98512994040,0cyclictest0-21swapper/519:17:2211
98528993315,18cyclictest0-21swapper/919:15:1415
9852199318,1cyclictest0-21swapper/723:29:0213
98543992927,1cyclictest1612-21snmpd23:27:565
98528992925,3cyclictest1612-21snmpd21:27:3215
98524992927,1cyclictest0-21swapper/823:54:1014
9854999280,27cyclictest0-21swapper/1523:44:287
98543992826,1cyclictest1612-21snmpd19:17:005
9854399280,27cyclictest0-21swapper/1322:22:325
9854399280,27cyclictest0-21swapper/1320:43:285
9854399280,27cyclictest0-21swapper/1320:24:295
9854399280,27cyclictest0-21swapper/1300:20:415
9853999280,27cyclictest0-21swapper/1219:58:444
9853399280,27cyclictest0-21swapper/1000:03:442
98528992827,1cyclictest0-21swapper/919:34:5915
9852499280,27cyclictest0-21swapper/819:51:4614
98521992827,1cyclictest1612-21snmpd20:05:0513
98521992825,2cyclictest1612-21snmpd20:02:1713
98512992827,1cyclictest1612-21snmpd20:56:1611
9851299280,1cyclictest0-21swapper/523:21:2011
98508992827,1cyclictest0-21swapper/423:58:2210
9850199280,27cyclictest0-21swapper/221:26:078
98496992827,1cyclictest1612-21snmpd23:34:591
98493992827,1cyclictest1612-21snmpd19:51:460
98549992726,1cyclictest1612-21snmpd23:22:587
9854999270,1cyclictest0-21swapper/1521:39:327
9854999270,1cyclictest0-21swapper/1520:49:047
9854999270,1cyclictest0-21swapper/1519:13:337
98547992726,1cyclictest1612-21snmpd19:50:226
98547992726,1cyclictest0-21swapper/1422:03:216
98547992726,1cyclictest0-21swapper/1420:25:506
9854799270,27cyclictest0-21swapper/1422:20:446
9854799270,27cyclictest0-21swapper/1420:22:116
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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