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2025-12-10 - 04:10

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 Wed Dec 10, 2025 00:43:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
24865211896,17sleep30-21swapper/319:07:263
24818211897,16sleep10-21swapper/119:06:481
24859211796,16sleep20-21swapper/219:07:212
24837211793,19sleep00-21swapper/019:07:030
161282770,1sleep30-21swapper/323:30:153
161282770,1sleep30-21swapper/323:30:153
320122750,0sleep00-21swapper/023:45:510
201642740,0sleep10-21swapper/121:54:451
220022650,6sleep12509499cyclictest22:30:001
171722550,1sleep30-21swapper/321:50:263
25093993416,16cyclictest0-21swapper/021:00:130
13062230,0sleep20-21swapper/220:50:172
2509499210,19cyclictest0-21swapper/122:15:101
74112200,0sleep00-21swapper/022:15:000
64852200,0sleep30-21swapper/323:53:563
25096992017,2cyclictest661-21kworker/u8:122:29:033
2509699200,2cyclictest0-21swapper/300:35:123
2509599200,2cyclictest0-21swapper/220:10:152
2509399200,18cyclictest0-21swapper/020:40:120
25096991916,2cyclictest661-21kworker/u8:122:08:043
25096991916,2cyclictest5883-21kworker/u8:123:57:053
32092180,1sleep121-21rcuc/121:36:131
25096991815,2cyclictest8630-21kworker/u8:019:52:013
25096991815,2cyclictest8574-21kworker/u8:221:07:043
25096991815,2cyclictest5087-21kworker/u8:223:13:043
25096991815,2cyclictest5087-21kworker/u8:223:06:043
25096991815,2cyclictest31039-21kworker/u8:219:46:043
25096991815,2cyclictest3081-21kworker/u8:120:57:043
25096991815,2cyclictest24952-21kworker/u8:022:34:013
25096991815,2cyclictest20829-21kworker/u8:221:24:043
25096991815,2cyclictest19348-21kworker/u8:021:13:043
25096991815,2cyclictest13253-21kworker/u8:220:18:013
25096991815,2cyclictest12522-21kworker/u8:121:15:043
2509599183,2cyclictest0-21swapper/223:15:132
25093991815,2cyclictest8542-21kworker/u8:123:41:050
25093991815,2cyclictest16712-21kworker/u8:000:10:050
25096991714,2cyclictest661-21kworker/u8:122:24:043
25096991714,2cyclictest661-21kworker/u8:122:18:043
25096991714,2cyclictest5087-21kworker/u8:223:27:043
25096991714,2cyclictest5087-21kworker/u8:223:02:013
25096991714,2cyclictest31039-21kworker/u8:219:28:013
25096991714,2cyclictest3081-21kworker/u8:121:00:033
25096991714,2cyclictest28875-21kworker/u8:023:20:013
25096991714,2cyclictest16712-21kworker/u8:000:05:043
2509699171,14cyclictest0-21swapper/321:35:473
2509699170,2cyclictest0-21swapper/322:01:043
2509699170,2cyclictest0-21swapper/320:34:013
2509699170,13cyclictest0-21swapper/322:54:593
25093991714,2cyclictest24952-21kworker/u8:022:45:040
25096991613,2cyclictest8630-21kworker/u8:019:56:043
25096991613,2cyclictest8542-21kworker/u8:123:35:043
25096991613,2cyclictest5087-21kworker/u8:223:15:043
25096991613,2cyclictest4413-21kworker/u8:119:43:043
25096991613,2cyclictest31039-21kworker/u8:219:37:043
25096991613,2cyclictest27695-21kworker/u8:021:47:043
25096991613,2cyclictest24952-21kworker/u8:022:35:043
25096991613,2cyclictest15998-21kworker/u8:022:58:013
25096991613,2cyclictest13253-21kworker/u8:220:20:043
25096991613,2cyclictest11415-21kworker/u8:200:14:043
2509699160,12cyclictest0-21swapper/320:36:003
2509699160,12cyclictest0-21swapper/319:22:043
2509699160,11cyclictest0-21swapper/320:49:043
2509599163,7cyclictest2307-21ssh23:50:012
25095991611,3cyclictest14921-21ntp_states00:35:192
2509399160,3cyclictest0-21swapper/020:45:160
2509399160,14cyclictest13898-21grep22:20:260
25096991512,2cyclictest4413-21kworker/u8:120:01:043
25096991512,2cyclictest15364-21kworker/u8:221:55:043
25096991512,2cyclictest11415-21kworker/u8:200:34:043
25096991512,2cyclictest11415-21kworker/u8:200:18:043
25096991510,3cyclictest0-21swapper/323:40:183
2509699150,2cyclictest0-21swapper/321:43:043
2509699150,10cyclictest0-21swapper/320:52:013
2509599152,7cyclictest0-21swapper/222:10:002
2509599151,2cyclictest25456-21ssh23:40:142
25095991511,2cyclictest0-21swapper/223:20:202
25095991510,3cyclictest0-21swapper/200:20:282
2509599150,3cyclictest3116-21ssh21:36:042
2509599150,13cyclictest0-21swapper/222:30:142
2509599150,13cyclictest0-21swapper/222:15:032
2509599150,13cyclictest0-21swapper/221:57:042
2509499151,3cyclictest21873-21cat00:10:011
25094991512,2cyclictest0-21swapper/123:25:521
25094991511,2cyclictest29259-21latency_hist20:40:001
25094991510,3cyclictest9065-21sendmail-mta00:30:081
2509499150,13cyclictest0-21swapper/121:20:221
2509399152,8cyclictest13932-21ssh22:55:000
25093991512,2cyclictest19348-21kworker/u8:021:11:040
2509399151,12cyclictest0-21swapper/020:25:150
25093991510,3cyclictest17235-21ssh00:05:160
25093991510,3cyclictest0-21swapper/022:59:180
2509399150,2cyclictest8931-21diskmemload23:36:160
2509399150,2cyclictest1907-21ssh00:22:040
2509399150,2cyclictest0-21swapper/023:55:000
2509399150,13cyclictest0-21swapper/022:41:170
2509399150,13cyclictest0-21swapper/019:45:140
2509399150,12cyclictest0-21swapper/023:25:130
25096991411,2cyclictest27695-21kworker/u8:021:32:013
25096991411,2cyclictest27482-21kworker/u8:019:31:043
25096991411,2cyclictest13253-21kworker/u8:220:25:043
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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