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2026-07-09 - 07:49

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #2, slot #7

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 rack2slot7s.osadl.org (updated Thu Jul 09, 2026 00:43:18)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2664001996655,7cyclictest2803590-21cups-browsed00:10:361
2664002996253,4cyclictest0-21swapper/200:25:532
2664000996142,15cyclictest2819899-40mandb00:26:000
2664001995645,7cyclictest2820018-21cat00:25:491
2664000995447,4cyclictest2759117-21modprobe22:45:400
2664002995137,11cyclictest2807624-21sh00:05:372
2664001995142,5cyclictest2787050-21unixbench_multi23:30:491
2664001995126,22cyclictest2718395-21idleruntime-cro21:40:011
2664000994927,19cyclictest2727518-21cron21:55:010
2664000994920,3cyclictest0-21swapper/022:40:390
2664002994833,9cyclictest36-21ksoftirqd/219:55:372
2664002994833,8cyclictest0-21swapper/223:35:402
2664002994739,3cyclictest0-21swapper/221:10:012
266400199478,24cyclictest2699988-21diskmemload21:28:291
2664001994739,5cyclictest2815585-21ssh00:20:011
2664002994633,8cyclictest2782401-21munin-plugin-st23:25:012
2664000994637,6cyclictest421-21dbus-daemon00:10:470
2664002994534,4cyclictest0-21swapper/200:00:022
2664002994527,12cyclictest2813635-21sh00:15:382
2664001994530,12cyclictest0-21swapper/123:38:471
2664001994524,18cyclictest0-21swapper/100:00:001
2664001994523,18cyclictest0-21swapper/121:10:011
2664000994536,6cyclictest2803590-21cups-browsed00:17:450
2664002994432,6cyclictest0-21swapper/222:55:432
266400199441,17cyclictest2666499-21ps19:15:451
2664000994424,17cyclictest0-21swapper/019:55:010
2664000994421,17cyclictest12650irq/32-eth022:50:400
2664000994420,4cyclictest2663999-21cyclictest21:11:000
266400099441,14cyclictest2788862-21basename23:35:260
2664001994335,5cyclictest2818575-21ssh00:25:011
266400199432,6cyclictest2777449-21ntpq23:15:431
2664002994235,3cyclictest0-21swapper/222:40:012
2664002994235,3cyclictest0-21swapper/222:25:422
266400199425,5cyclictest271ktimers/121:15:391
2664001994237,2cyclictest0-21swapper/122:00:371
2664001994230,8cyclictest1-21systemd00:40:021
2664001994220,19cyclictest0-21swapper/122:50:361
2664000994236,4cyclictest2691014-21systemd-run20:40:020
2664000994221,17cyclictest2697198-21latency_hist21:00:030
266400099421,24cyclictest2777401-21ntpq23:15:410
2664002994132,6cyclictest2724473-21ssh21:50:012
266400199413,5cyclictest2684391-21ntpq20:15:381
2664001994127,11cyclictest0-21swapper/122:15:481
2664001994127,11cyclictest0-21swapper/122:15:481
2664001994122,17cyclictest0-21swapper/122:40:461
2664001994116,22cyclictest0-21swapper/120:20:361
2664001994116,22cyclictest0-21swapper/120:20:361
2664000994132,6cyclictest1002-21mta-sts-daemon22:21:450
2664000994122,2cyclictest0-21swapper/021:40:020
2664000994121,17cyclictest0-21swapper/020:35:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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