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2026-07-07 - 11:39

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #3

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, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack5slot3s.osadl.org (updated Tue Jul 07, 2026 00:44:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
41192241164,24sleep20-21swapper/219:09:342
38932238165,25sleep00-21swapper/019:06:380
38842236163,24sleep10-21swapper/119:06:301
38912203166,24sleep30-21swapper/319:06:373
2027821650,4sleep3426299cyclictest23:26:353
36482750,4sleep1425299cyclictest21:35:231
4257995956,2cyclictest0-21swapper/222:10:432
193872560,4sleep2425799cyclictest21:00:012
149492530,1sleep121-21rcuc/100:30:141
297952520,4sleep339-21rcuc/322:35:183
246392430,1sleep30-21swapper/321:10:183
40082420,3sleep24011-21latency_hist20:25:012
424799379,13cyclictest23722-21diskmemload23:25:000
43382330,18sleep20-21swapper/222:50:212
4252992912,15cyclictest23150-21kworker/u8:219:43:131
4252992912,15cyclictest23150-21kworker/u8:219:43:131
4252992910,6cyclictest14223-40dnf19:34:051
425299285,21cyclictest23-21ksoftirqd/100:00:071
426299272,16cyclictest23726-21munin-run21:10:003
425299271,20cyclictest0-21swapper/120:17:101
424799272,12cyclictest23103-21munin-run19:55:010
426299260,15cyclictest1682-21switchtime21:30:273
425299261,21cyclictest25316-21cpuspeed_turbos23:40:121
425299260,15cyclictest0-21swapper/121:15:291
189582260,4sleep339-21rcuc/319:45:103
426299257,3cyclictest17430-21awk00:40:013
426299251,16cyclictest41-21ksoftirqd/300:23:183
426299251,16cyclictest41-21ksoftirqd/300:23:183
425299251,6cyclictest0-21swapper/121:47:411
4252992512,11cyclictest16190-21kworker/u8:122:15:291
425299251,16cyclictest10116-21sed20:35:261
4252992510,13cyclictest27118-21kworker/u8:123:56:471
425299250,10cyclictest23722-21diskmemload22:10:271
4247992514,3cyclictest0-21swapper/023:25:270
424799251,12cyclictest17758-21awk22:10:010
426299248,10cyclictest87350irq/126-enp1s0-22:25:273
426299246,3cyclictest41-21ksoftirqd/323:45:023
426299241,15cyclictest0-21swapper/321:50:163
426299241,12cyclictest0-21swapper/323:09:113
425299249,4cyclictest0-21swapper/122:45:071
425299247,4cyclictest0-21swapper/123:27:411
425299242,3cyclictest18941-21users20:55:281
425299241,16cyclictest0-21swapper/122:41:141
424799240,11cyclictest10208-21idleruntime-cro00:20:010
4262992310,5cyclictest401ktimersoftd/322:40:133
425799231,5cyclictest0-21swapper/223:25:282
425299238,9cyclictest0-21swapper/100:28:431
425299231,5cyclictest0-21swapper/123:00:441
425299231,2cyclictest17236-21sshd00:37:541
425299231,16cyclictest0-21swapper/122:31:551
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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