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2024-04-20 - 00:21

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 50 highest latencies:
System rack3slot6s.osadl.org (updated Fri Apr 19, 2024 12:43:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
18009210992,12sleep10-21swapper/107:09:051
18011210488,11sleep30-21swapper/307:09:073
17140210478,6sleep00-21swapper/007:05:200
18010210179,17sleep20-21swapper/207:09:062
245212870,1sleep1221ktimersoftd/112:30:131
54562820,1sleep30-21swapper/309:48:063
279622760,5sleep11811199cyclictest10:11:571
1811199371,34cyclictest0-21swapper/112:00:111
1811199291,2cyclictest1790-21diskmemload09:50:091
18111992716,3cyclictest0-21swapper/108:10:131
120612250,0sleep00-21swapper/009:55:110
142112240,0sleep20-21swapper/209:22:192
1811299230,18cyclictest0-21swapper/209:37:042
1811399220,3cyclictest0-21swapper/309:16:013
1811199220,2cyclictest0-21swapper/112:05:091
115572220,0sleep30-21swapper/311:40:243
1811399210,3cyclictest31191-21missed_timers07:40:173
1811399210,3cyclictest0-21swapper/307:30:253
1811399210,12cyclictest9746-21ssh10:29:413
1811299211,18cyclictest0-21swapper/212:05:042
1811299211,15cyclictest0-21swapper/211:50:052
1811199211,2cyclictest0-21swapper/108:30:121
1811199210,19cyclictest0-21swapper/110:45:091
1811199210,19cyclictest0-21swapper/107:45:101
1811399200,3cyclictest6126-21ssh09:14:203
1811399200,3cyclictest4344-21ssh10:23:373
1811399200,3cyclictest345-21diskstats07:45:123
1811399200,3cyclictest29834-21ssh11:25:203
1811399200,3cyclictest28800-21sh09:38:283
1811399200,3cyclictest24487-21telnet08:45:123
1811399200,3cyclictest21309-21ps08:35:183
1811399200,3cyclictest14724-21ssh09:57:573
1811399200,3cyclictest0-21swapper/310:10:013
1811399200,3cyclictest0-21swapper/309:30:413
1811399200,2cyclictest17591-21ssh09:25:283
1811399200,2cyclictest0-21swapper/309:50:103
1811399200,18cyclictest0-21swapper/308:40:103
1811299203,2cyclictest0-21swapper/212:18:052
18112992017,2cyclictest7752-21kworker/u8:011:37:052
18112992017,2cyclictest31006-21kworker/u8:012:13:042
18112992017,2cyclictest18450-21kworker/u8:007:17:042
18112992017,2cyclictest17409-21kworker/u8:010:17:042
18112992017,2cyclictest17409-21kworker/u8:010:09:042
18112992017,2cyclictest16339-21kworker/u8:108:29:042
18112992017,2cyclictest16205-21kworker/u8:009:29:042
18112992017,2cyclictest13795-21kworker/u8:210:39:042
18112992017,2cyclictest13766-21kworker/u8:012:23:032
18112992017,2cyclictest1336-21kworker/u8:209:57:052
18112992017,2cyclictest11763-21kworker/u8:207:24:052
1811299200,15cyclictest0-21swapper/211:11:052
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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