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2026-05-10 - 00:58

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 Sat May 09, 2026 00:45:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
29121662356312,16sleep70-21swapper/719:07:3013
29121602355346,6sleep10-21swapper/119:07:231
29120562352308,35sleep100-21swapper/1019:05:562
29120402352306,15sleep110-21swapper/1119:05:413
29121272343299,17sleep60-21swapper/619:06:5612
29120252343318,17sleep140-21swapper/1419:05:286
29121952342316,17sleep20-21swapper/219:07:578
29123032340321,7sleep00-21swapper/019:09:310
29122222339313,17sleep80-21swapper/819:08:1914
29122072338312,17sleep130-21swapper/1319:08:085
29120672338314,15sleep30-21swapper/319:06:059
29121812337311,17sleep50-21swapper/519:07:4411
29121362337311,17sleep150-21swapper/1519:07:067
29123152336313,15sleep120-21swapper/1219:09:444
29122952335309,17sleep90-21swapper/919:09:2415
29121252332306,17sleep40-21swapper/419:06:5310
291266899430,42cyclictest0-21swapper/200:09:408
2912668994039,1cyclictest1561-21snmpd19:21:338
2912708993737,0cyclictest0-21swapper/1221:51:014
2912700993736,1cyclictest1561-21snmpd00:09:402
2912679993737,0cyclictest0-21swapper/522:21:5211
2912718993636,0cyclictest0-21swapper/1421:51:016
2912695993636,0cyclictest0-21swapper/919:21:3315
2912676993534,1cyclictest1561-21snmpd00:23:0710
2912656993535,0cyclictest0-21swapper/023:04:110
2912656993535,0cyclictest0-21swapper/023:04:110
2912705993434,0cyclictest0-21swapper/1123:02:263
2912705993434,0cyclictest0-21swapper/1123:02:263
2912700993433,1cyclictest1561-21snmpd23:27:422
2912700993433,1cyclictest0-21swapper/1019:21:332
2912685993434,0cyclictest0-21swapper/622:01:1612
2912685993433,1cyclictest1561-21snmpd21:53:0712
2912708993333,0cyclictest0-21swapper/1221:57:034
291269099336,18cyclictest0-21swapper/823:27:0014
2912676993130,1cyclictest1561-21snmpd19:11:2710
291267199310,30cyclictest0-21swapper/320:39:099
291272399306,11cyclictest0-21swapper/1521:17:467
2912671993028,1cyclictest0-21swapper/321:31:289
2912661993030,0cyclictest0-21swapper/123:24:151
2912656993030,0cyclictest0-21swapper/023:24:150
291271399292,27cyclictest0-21swapper/1321:07:185
291267699290,29cyclictest0-21swapper/420:29:3810
2912671992928,1cyclictest1561-21snmpd22:30:279
2912661992928,1cyclictest1561-21snmpd20:11:161
291266199290,1cyclictest0-21swapper/119:19:241
2912723992827,1cyclictest1561-21snmpd19:57:017
2912723992826,2cyclictest0-21swapper/1523:51:217
291272399280,27cyclictest0-21swapper/1523:18:297
291272399280,27cyclictest0-21swapper/1521:33:247
291272399280,27cyclictest0-21swapper/1521:28:517
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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