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2026-09-07 - 15:30

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 Mon Sep 07, 2026 12:43:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
23609211290,17sleep30-21swapper/307:07:363
23584211288,19sleep00-21swapper/007:07:170
23778210695,6sleep20-21swapper/207:09:472
23550210383,15sleep10-21swapper/107:06:501
114762780,5sleep02382299cyclictest07:56:040
190992700,0sleep00-21swapper/010:58:380
254862690,0sleep20-21swapper/210:00:112
183522690,1sleep30-21swapper/309:52:153
177772580,4sleep12382499cyclictest09:19:581
23826993516,17cyclictest0-21swapper/309:30:123
23826993516,17cyclictest0-21swapper/309:30:123
2382499330,18cyclictest0-21swapper/109:34:051
2382499330,18cyclictest0-21swapper/109:34:041
23822993323,8cyclictest7921-21diskmemload10:44:010
23824993229,2cyclictest12655-21kworker/u8:309:49:051
23822993126,3cyclictest1431-21kworker/u8:011:48:020
28192300,0sleep00-21swapper/009:36:290
2382699300,2cyclictest0-21swapper/312:25:133
23824993027,2cyclictest30547-21kworker/u8:010:28:051
23824992926,2cyclictest7924-21kworker/u8:211:31:041
23824992926,2cyclictest30030-21kworker/u8:212:30:041
23824992926,2cyclictest16609-21kworker/u8:210:35:051
2382299292,18cyclictest0-21swapper/009:44:050
23822992825,2cyclictest27715-21kworker/u8:211:43:040
23822992825,2cyclictest14151-21kworker/u8:111:34:040
23824992724,2cyclictest30547-21kworker/u8:010:14:051
23824992724,2cyclictest23033-21kworker/u8:012:16:061
23822992724,2cyclictest7924-21kworker/u8:211:26:050
23822992724,2cyclictest18469-21kworker/u8:009:58:050
23824992623,2cyclictest8578-21kworker/u8:209:43:051
23824992623,2cyclictest23017-21kworker/u8:110:50:011
23824992623,2cyclictest14151-21kworker/u8:111:29:051
23824992622,2cyclictest30123-21kworker/u8:007:26:041
66082250,0sleep00-21swapper/010:13:170
23824992522,2cyclictest7698-21kworker/u8:210:49:051
23824992522,2cyclictest32216-21kworker/u8:009:35:041
23824992522,2cyclictest24492-21kworker/u8:109:59:051
23824992522,2cyclictest23017-21kworker/u8:111:00:051
23824992522,2cyclictest23017-21kworker/u8:110:59:051
23824992522,2cyclictest1431-21kworker/u8:011:57:041
23824992522,2cyclictest1431-21kworker/u8:011:47:051
23822992522,2cyclictest7698-21kworker/u8:211:02:060
23822992522,2cyclictest30547-21kworker/u8:010:29:050
23824992421,2cyclictest7698-21kworker/u8:211:11:051
23824992421,2cyclictest7698-21kworker/u8:211:08:041
23824992421,2cyclictest30547-21kworker/u8:010:09:051
23824992421,2cyclictest30030-21kworker/u8:212:23:041
23824992421,2cyclictest24492-21kworker/u8:110:21:051
23824992421,2cyclictest23036-21kworker/u8:109:29:051
23824992421,2cyclictest23036-21kworker/u8:109:29:051
23824992421,2cyclictest23033-21kworker/u8:012:13:051
23824992421,2cyclictest23017-21kworker/u8:110:34:051
23824992421,2cyclictest21318-21kworker/u8:212:39:051
23824992421,2cyclictest1600-21kworker/u8:011:15:041
23824992421,2cyclictest1431-21kworker/u8:011:50:051
23824992421,2cyclictest14151-21kworker/u8:111:40:041
23824992421,2cyclictest12655-21kworker/u8:309:54:041
23822992421,2cyclictest1431-21kworker/u8:011:54:050
5632230,0sleep30-21swapper/307:30:183
23824992320,2cyclictest7924-21kworker/u8:211:22:051
23824992320,2cyclictest30547-21kworker/u8:010:15:041
23824992320,2cyclictest30123-21kworker/u8:007:50:021
23824992320,2cyclictest16609-21kworker/u8:210:40:011
23824992320,2cyclictest14151-21kworker/u8:111:35:051
23822992320,2cyclictest3016-21kworker/u8:208:58:050
23822992320,2cyclictest30030-21kworker/u8:212:19:050
23822992320,2cyclictest27815-21kworker/u8:111:17:040
23822992320,2cyclictest24492-21kworker/u8:110:23:050
23822992320,2cyclictest24492-21kworker/u8:110:07:050
23822992320,2cyclictest23033-21kworker/u8:012:37:050
23822992320,2cyclictest15162-21kworker/u8:009:25:050
23822992320,2cyclictest15162-21kworker/u8:009:25:040
23822992320,2cyclictest15162-21kworker/u8:009:19:040
2382299230,16cyclictest0-21swapper/009:30:050
2382299230,16cyclictest0-21swapper/009:30:040
23824992219,2cyclictest30123-21kworker/u8:007:49:051
23824992219,2cyclictest24109-21kworker/u8:207:17:051
23824992219,2cyclictest24025-21kworker/u8:009:07:051
23824992219,2cyclictest24025-21kworker/u8:008:54:041
23824992219,2cyclictest24025-21kworker/u8:008:46:051
23824992219,2cyclictest20256-21kworker/u8:108:24:051
23824992219,2cyclictest15162-21kworker/u8:009:21:051
23824992219,2cyclictest15162-21kworker/u8:009:21:041
23822992219,2cyclictest23017-21kworker/u8:110:54:010
23822992219,2cyclictest12655-21kworker/u8:309:48:060
2382299220,18cyclictest0-21swapper/009:20:050
2382299220,18cyclictest0-21swapper/009:20:050
23826992117,2cyclictest0-21swapper/309:10:103
2382699211,18cyclictest0-21swapper/307:35:153
2382699210,19cyclictest4542-21python11:16:013
23824992118,2cyclictest3016-21kworker/u8:209:00:041
23824992118,2cyclictest30123-21kworker/u8:007:37:041
23824992118,2cyclictest24109-21kworker/u8:207:22:051
23824992118,2cyclictest20256-21kworker/u8:108:25:041
23824992118,2cyclictest13684-21kworker/u8:008:05:051
23822992118,2cyclictest23017-21kworker/u8:110:33:050
23822992118,2cyclictest12655-21kworker/u8:310:02:060
2382299210,16cyclictest0-21swapper/010:37:050
2382699201,17cyclictest32451-21ssh10:39:553
2382699201,17cyclictest28584-21sendmail-mta12:15:103
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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