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2026-04-25 - 16:25

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, slot #6

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
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rack3slot6s.osadl.org (updated Sat Apr 25, 2026 12:43:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1054221390,0sleep20-21swapper/209:45:122
24424211794,16sleep10-21swapper/107:05:401
251412116105,6sleep30-21swapper/307:09:393
25106211493,15sleep00-21swapper/007:09:110
25001210796,6sleep20-21swapper/207:07:492
234602920,0sleep00-21swapper/008:25:140
271692550,1sleep011-21rcuc/011:42:340
2519799221,19cyclictest8664-21diskmemload10:05:111
2519699221,19cyclictest0-21swapper/011:45:120
25198992118,2cyclictest20577-21kworker/u8:311:44:042
2519799211,18cyclictest0-21swapper/107:20:131
2519699211,18cyclictest0-21swapper/012:20:110
2519699210,19cyclictest0-21swapper/011:30:110
2519699210,19cyclictest0-21swapper/010:20:110
116792210,1sleep121-21rcuc/112:34:011
25199992017,2cyclictest24213-21kworker/u8:011:20:043
25199992017,2cyclictest1414-21kworker/u8:210:45:053
2519999200,18cyclictest0-21swapper/310:05:103
2519899204,2cyclictest3297-21ssh11:18:042
25198992017,2cyclictest11894-21kworker/u8:111:30:052
25199991916,2cyclictest9655-21kworker/u8:210:28:043
25198991916,2cyclictest754-21kworker/u8:008:52:012
25198991916,2cyclictest26627-21kworker/u8:007:47:042
25198991916,2cyclictest26627-21kworker/u8:007:22:052
25198991916,2cyclictest25505-21kworker/u8:011:45:042
25198991916,2cyclictest21016-21kworker/u8:109:27:042
25198991916,2cyclictest16816-21kworker/u8:010:03:042
25198991916,2cyclictest11922-21kworker/u8:211:04:052
2519899190,14cyclictest0-21swapper/209:17:042
242432190,1sleep2301ktimersoftd/212:13:182
287952180,0sleep10-21swapper/111:10:241
25198991815,2cyclictest9655-21kworker/u8:210:22:012
25198991815,2cyclictest8438-21kworker/u8:107:19:042
25198991815,2cyclictest6664-21kworker/u8:110:49:042
25198991815,2cyclictest4530-21kworker/u8:110:13:052
25198991815,2cyclictest31166-21kworker/u8:207:29:042
25198991815,2cyclictest24213-21kworker/u8:011:23:042
25198991815,2cyclictest21016-21kworker/u8:109:22:052
25198991815,2cyclictest20534-21kworker/u8:010:52:042
25198991815,2cyclictest20534-21kworker/u8:010:34:042
25198991815,2cyclictest18759-21kworker/u8:208:49:042
25198991815,2cyclictest18759-21kworker/u8:208:20:042
25198991815,2cyclictest15175-21kworker/u8:008:12:042
2519899180,14cyclictest0-21swapper/208:18:042
25199991714,2cyclictest9655-21kworker/u8:210:17:043
25199991714,2cyclictest32095-21kworker/u8:111:52:043
25199991714,2cyclictest29171-21kworker/u8:012:34:043
25199991714,2cyclictest24213-21kworker/u8:011:08:053
25199991714,2cyclictest24104-21kworker/u8:212:21:043
25199991714,2cyclictest17439-21kworker/u8:111:12:053
25199991714,2cyclictest10994-21kworker/u8:209:12:043
2519999170,12cyclictest0-21swapper/311:28:043
25198991714,2cyclictest754-21kworker/u8:009:03:042
25198991714,2cyclictest754-21kworker/u8:008:55:052
25198991714,2cyclictest32095-21kworker/u8:111:54:052
25198991714,2cyclictest29136-21kworker/u8:109:07:042
25198991714,2cyclictest28884-1kworker/u9:210:40:042
25198991714,2cyclictest26627-21kworker/u8:007:38:012
25198991714,2cyclictest25505-21kworker/u8:012:01:042
25198991714,2cyclictest25505-21kworker/u8:011:59:042
25198991714,2cyclictest18759-21kworker/u8:208:35:042
25198991714,2cyclictest17439-21kworker/u8:111:10:052
25198991714,2cyclictest11922-21kworker/u8:210:59:042
2519899171,14cyclictest26391-21irqstats12:15:182
2519899170,2cyclictest0-21swapper/212:06:052
25196991712,3cyclictest0-21swapper/010:36:250
30022160,0sleep10-21swapper/111:17:371
25199991613,2cyclictest29171-21kworker/u8:012:28:063
25199991613,2cyclictest29136-21kworker/u8:109:15:043
25199991613,2cyclictest26627-21kworker/u8:007:46:043
25199991613,2cyclictest26627-21kworker/u8:007:32:023
2519999160,2cyclictest0-21swapper/311:18:043
2519999160,11cyclictest0-21swapper/312:15:043
25198991613,2cyclictest27694-21kworker/u8:210:09:042
25198991613,2cyclictest27010-21kworker/u8:009:39:042
25198991613,2cyclictest21016-21kworker/u8:109:34:012
2519899160,2cyclictest0-21swapper/212:37:042
2519899160,2cyclictest0-21swapper/210:26:042
2519899160,15cyclictest0-21swapper/212:25:042
2519799161,3cyclictest15890-21munin-node1
2519799161,13cyclictest0-21swapper/109:30:141
25196991611,3cyclictest0-21swapper/009:37:560
25199991512,2cyclictest6384-21kworker/u8:207:52:023
25199991512,2cyclictest31166-21kworker/u8:207:26:043
25199991512,2cyclictest25505-21kworker/u8:012:02:053
25199991512,2cyclictest25505-21kworker/u8:011:58:043
25199991512,2cyclictest25505-21kworker/u8:011:42:013
25199991512,2cyclictest20577-21kworker/u8:311:37:053
25199991512,2cyclictest20534-21kworker/u8:010:32:043
25199991512,2cyclictest18759-21kworker/u8:208:44:023
25199991512,2cyclictest15175-21kworker/u8:008:08:053
25199991512,2cyclictest11922-21kworker/u8:211:02:013
25199991512,2cyclictest11922-21kworker/u8:210:58:053
25198991512,2cyclictest23384-21kworker/u8:207:11:042
25198991512,2cyclictest18759-21kworker/u8:208:30:052
25198991512,2cyclictest18759-21kworker/u8:208:26:042
2519899150,2cyclictest0-21swapper/211:36:052
2519899150,2cyclictest0-21swapper/210:16:042
2519899150,2cyclictest0-21swapper/209:53:042
2519899150,2cyclictest0-21swapper/208:01:042
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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