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2026-03-09 - 22:56

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, slot #4

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 rack0slot4s.osadl.org (updated Mon Mar 09, 2026 00:46:20)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
14434922376355,14sleep20-21swapper/219:08:428
14433772375368,4sleep50-21swapper/519:07:0911
14435442359321,12sleep40-21swapper/419:09:1610
14434012357315,14sleep80-21swapper/819:07:2814
14433692357336,14sleep00-21swapper/019:07:040
14433022357322,28sleep110-21swapper/1119:06:103
14433172356336,13sleep70-21swapper/719:06:2213
14432952356337,12sleep60-21swapper/619:06:0612
14434082353333,13sleep150-21swapper/1519:07:357
14435092352334,12sleep130-21swapper/1319:08:545
14434572352332,13sleep30-21swapper/319:08:119
14433242351330,14sleep140-21swapper/1419:06:306
14435242350330,13sleep90-21swapper/919:09:0515
14433862349329,13sleep120-21swapper/1219:07:164
14436002346326,13sleep100-21swapper/1019:09:542
14435402346327,13sleep10-21swapper/119:09:131
144397399989,89cyclictest0-21swapper/420:21:5910
1443965998932,29cyclictest0-21swapper/220:22:008
1443999998022,30cyclictest0-21swapper/1320:22:005
1443963997518,29cyclictest0-21swapper/120:22:001
1443989996968,1cyclictest3318-21Xorg20:22:002
1443975996723,44cyclictest0-21swapper/520:22:0011
144399499645,15cyclictest0-21swapper/1120:22:003
144398099560,26cyclictest0-21swapper/720:22:0013
1443996994140,1cyclictest3318-21Xorg20:22:004
144400199391,13cyclictest1642753-21df_abs22:25:126
1443968993837,1cyclictest3318-21Xorg20:22:019
1443987993635,1cyclictest3318-21Xorg20:22:0015
144396599364,30cyclictest1746406-21kworker/u32:4+flush-259:000:03:128
144396599364,30cyclictest1746406-21kworker/u32:4+flush-259:000:03:118
1443994993535,0cyclictest0-21swapper/1123:41:203
1443994993535,0cyclictest0-21swapper/1100:20:123
1443987993535,0cyclictest0-21swapper/921:15:1415
1444005993433,1cyclictest3318-21Xorg20:22:007
144396599340,31cyclictest0-21swapper/223:59:028
144396599340,31cyclictest0-21swapper/223:59:028
144400599330,30cyclictest0-21swapper/1523:30:147
1443987993333,0cyclictest0-21swapper/922:52:5515
144396599332,30cyclictest1676522-21kworker/u32:4+flush-259:023:20:108
144396599330,33cyclictest0-21swapper/220:41:058
144396599330,30cyclictest0-21swapper/221:09:208
144396599330,30cyclictest0-21swapper/221:09:208
144396599330,0cyclictest0-21swapper/221:01:508
144396599330,0cyclictest0-21swapper/221:01:498
1443959993319,14cyclictest0-21swapper/020:22:000
144399999320,29cyclictest0-21swapper/1322:00:165
1443994993232,0cyclictest0-21swapper/1123:10:353
1443994993232,0cyclictest0-21swapper/1121:28:053
1443987993232,0cyclictest0-21swapper/921:53:0915
1443987993232,0cyclictest0-21swapper/921:24:0415
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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