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2026-04-07 - 15:01

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 Tue Apr 07, 2026 12:43:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
16731211897,16sleep00-21swapper/007:06:430
16840211696,15sleep20-21swapper/207:08:092
16270211696,15sleep10-21swapper/107:05:521
167072115104,6sleep30-21swapper/307:06:263
189062750,0sleep30-21swapper/311:41:373
1701699360,18cyclictest0-21swapper/309:25:123
1701699288,2cyclictest0-21swapper/312:20:123
1701599260,24cyclictest0-21swapper/208:25:122
1701499240,16cyclictest0-21swapper/109:25:121
1701699220,17cyclictest0-21swapper/312:36:043
17016992117,2cyclictest8109-21kworker/u8:012:05:053
1701599210,2cyclictest0-21swapper/209:45:122
17015992016,2cyclictest0-21swapper/209:50:122
1701599201,2cyclictest0-21swapper/212:20:122
1701499200,18cyclictest0-21swapper/111:55:121
17013992017,2cyclictest0-21swapper/009:50:110
17016991916,2cyclictest10527-21kworker/u8:011:03:043
17016991915,2cyclictest4701-21kworker/u8:210:57:043
17016991912,2cyclictest0-21swapper/311:19:053
17016991815,2cyclictest3918-21kworker/u8:309:49:043
17016991815,2cyclictest29292-21kworker/u8:311:32:063
1701699181,15cyclictest0-21swapper/309:11:013
17015991815,2cyclictest4701-21kworker/u8:211:10:052
17015991815,2cyclictest32129-21kworker/u8:111:20:062
17015991815,2cyclictest29292-21kworker/u8:311:26:042
17015991815,2cyclictest16521-21kworker/u8:111:41:042
1701599181,2cyclictest29-21rcuc/209:36:012
1701599180,16cyclictest0-21swapper/210:12:042
1701599180,13cyclictest0-21swapper/212:03:042
17016991714,2cyclictest23163-21kworker/u8:011:13:043
17015991714,2cyclictest9832-21kworker/u8:111:33:052
17015991714,2cyclictest8676-21kworker/u8:007:19:042
17015991714,2cyclictest6980-21kworker/u8:008:11:052
17015991714,2cyclictest4087-21kworker/u8:210:22:052
17015991714,2cyclictest25974-21kworker/u8:010:35:042
17015991714,2cyclictest25974-21kworker/u8:010:16:052
1701599170,12cyclictest0-21swapper/209:25:052
1701399171,14cyclictest10767-21ssh12:06:590
320582160,0sleep20-21swapper/209:41:032
1701699161,3cyclictest5573-21diskstats08:00:143
17016991613,2cyclictest3918-21kworker/u8:310:01:053
17016991613,2cyclictest25650-21kworker/u8:209:23:043
17016991613,2cyclictest24697-21kworker/u8:211:58:023
17016991613,2cyclictest12492-21kworker/u8:210:09:043
17016991612,2cyclictest29292-21kworker/u8:311:39:043
1701699161,13cyclictest19787-21df08:35:143
17015991613,2cyclictest8930-21kworker/u8:009:56:052
17015991613,2cyclictest6980-21kworker/u8:008:18:042
17015991613,2cyclictest4632-21kworker/u8:012:35:052
17015991613,2cyclictest25949-21kworker/u8:010:48:042
17015991613,2cyclictest25650-21kworker/u8:209:14:042
17015991613,2cyclictest23373-21kworker/u8:107:29:042
17015991613,2cyclictest1394-21kworker/u8:109:19:052
1701599160,15cyclictest0-21swapper/210:28:012
1701499161,13cyclictest21091-21diskstats09:30:131
1701399161,3cyclictest10255-21ssh11:33:090
148592160,0sleep00-21swapper/009:23:570
293962150,0sleep00-21swapper/009:00:000
1701699151,2cyclictest27079-21ssh09:36:023
17016991512,2cyclictest8930-21kworker/u8:009:58:053
17016991512,2cyclictest8676-21kworker/u8:007:48:023
17016991512,2cyclictest4087-21kworker/u8:210:47:043
17016991512,2cyclictest32129-21kworker/u8:110:53:053
17016991512,2cyclictest17542-21kworker/u8:108:42:013
17016991512,2cyclictest12460-21kworker/u8:009:44:013
1701699151,12cyclictest0-21swapper/311:28:553
17016991511,2cyclictest0-21swapper/307:26:013
1701699150,3cyclictest0-21swapper/311:05:143
1701699150,13cyclictest898-21diskmemload12:27:003
1701699150,13cyclictest898-21diskmemload12:03:403
1701699150,13cyclictest0-21swapper/310:25:113
17015991512,2cyclictest4701-21kworker/u8:210:55:052
17015991512,2cyclictest25650-21kworker/u8:209:20:042
17015991512,2cyclictest25650-21kworker/u8:208:59:042
17015991512,2cyclictest23373-21kworker/u8:108:07:042
17015991512,2cyclictest23373-21kworker/u8:107:43:042
17015991512,2cyclictest20909-21kworker/u8:207:21:052
1701599150,11cyclictest0-21swapper/208:47:042
1701599150,10cyclictest0-21swapper/211:37:042
1701599150,10cyclictest0-21swapper/210:52:012
1701499151,12cyclictest0-21swapper/109:40:251
1701399151,3cyclictest31047-21irqstats09:40:170
1701399151,12cyclictest8753-21ssh09:16:580
17013991510,3cyclictest4948-21apt08:00:000
17013991510,3cyclictest0-21swapper/008:45:130
1701399150,13cyclictest0-21swapper/011:21:030
1701399150,13cyclictest0-21swapper/007:30:010
17016991411,2cyclictest8676-21kworker/u8:007:12:023
17016991411,2cyclictest6980-21kworker/u8:008:23:053
17016991411,2cyclictest4087-21kworker/u8:210:40:053
17016991411,2cyclictest25974-21kworker/u8:010:21:043
17016991411,2cyclictest25974-21kworker/u8:010:13:043
17016991411,2cyclictest16521-21kworker/u8:111:47:043
17016991410,2cyclictest0-21swapper/307:15:043
1701699140,9cyclictest0-21swapper/309:15:043
1701699140,3cyclictest7763-21hostname09:50:123
1701699140,2cyclictest0-21swapper/309:30:003
1701699140,12cyclictest0-21swapper/312:30:143
1701699140,12cyclictest0-21swapper/311:50:113
1701599141,2cyclictest27387-21apt-get07:35:112
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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