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2026-06-16 - 08:38

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, 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 rack5slot3s.osadl.org (updated Tue Jun 16, 2026 00:44:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
127812230162,55sleep20-21swapper/219:09:492
127422225195,20sleep00-21swapper/019:09:190
126512203167,24sleep10-21swapper/119:08:071
125582203167,24sleep30-21swapper/319:06:573
1457921530,2sleep121-21rcuc/120:25:131
1719321410,2sleep31289799cyclictest19:15:233
87212720,1sleep20-21swapper/221:25:132
279702530,9sleep341-21ksoftirqd/322:10:013
149732510,3sleep00-21swapper/020:25:160
1288099348,12cyclictest30784-21munin-run23:30:000
12897993211,9cyclictest0-21swapper/321:34:553
1289799321,12cyclictest0-21swapper/323:08:063
1288099329,11cyclictest0-21swapper/021:15:000
12897993116,3cyclictest0-21swapper/322:21:273
1288099306,11cyclictest10990-21idleruntime-cro22:45:020
12897992918,4cyclictest0-21swapper/300:31:263
12897992918,4cyclictest0-21swapper/300:31:263
12897992915,3cyclictest0-21swapper/321:42:393
1289799291,11cyclictest0-21swapper/319:45:173
1289799291,10cyclictest0-21swapper/300:25:313
12897992817,3cyclictest0-21swapper/321:20:313
12897992813,3cyclictest0-21swapper/321:11:343
1289799281,12cyclictest0-21swapper/323:18:463
12897992810,4cyclictest4303-21smart_sda23:40:233
1289799280,19cyclictest0-21swapper/300:39:503
1289799280,12cyclictest0-21swapper/322:57:223
1288099280,13cyclictest6596-21idleruntime-cro22:35:020
12897992715,3cyclictest0-21swapper/322:03:393
12897992714,3cyclictest0-21swapper/323:36:393
1289799271,11cyclictest0-21swapper/321:59:513
1289799271,11cyclictest0-21swapper/300:05:013
1288099272,12cyclictest31136-21awk19:50:010
12897992615,3cyclictest0-21swapper/322:34:233
1289799261,15cyclictest0-21swapper/322:39:223
1289799261,11cyclictest0-21swapper/320:55:143
1289799261,10cyclictest0-21swapper/322:26:073
1289799261,10cyclictest0-21swapper/300:24:113
1289799260,9cyclictest0-21swapper/320:11:273
1289799260,13cyclictest0-21swapper/322:53:463
1289799260,11cyclictest0-21swapper/323:13:103
12886992616,3cyclictest0-21swapper/122:46:511
1288099265,10cyclictest18782-21/usr/sbin/munin20:35:190
1288099262,11cyclictest15000-21/usr/sbin/munin21:40:120
1288099260,13cyclictest11622-21awk00:00:010
1289799258,10cyclictest0-21swapper/322:49:303
12897992511,3cyclictest0-21swapper/323:45:353
1289799251,11cyclictest0-21swapper/319:55:073
12897992510,11cyclictest0-21swapper/300:19:113
1289799250,9cyclictest0-21swapper/322:41:043
1289399251,6cyclictest0-21swapper/200:14:562
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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