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2026-05-02 - 22:20

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #1

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.

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 rack4slot1s.osadl.org (updated Sat May 02, 2026 12:44:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1051321090,1sleep20-21swapper/208:17:362
1051321090,1sleep20-21swapper/208:17:362
2136321030,2sleep30-21swapper/308:47:323
2136321030,2sleep30-21swapper/308:47:323
209042880,2sleep20-21swapper/208:47:272
209042880,2sleep20-21swapper/208:47:272
40652620,2sleep30-21swapper/312:22:263
40652620,2sleep30-21swapper/312:22:263
40652620,2sleep30-21swapper/312:22:263
224462590,1sleep122621-21unixbench_multi11:42:381
224462590,1sleep122621-21unixbench_multi11:42:381
224462590,1sleep122621-21unixbench_multi11:42:381
188762590,3sleep20-21swapper/210:07:302
188762590,3sleep20-21swapper/210:07:302
149232550,3sleep20-21swapper/211:22:362
149232550,3sleep20-21swapper/211:22:362
214422470,2sleep20-21swapper/211:42:252
214422470,2sleep20-21swapper/211:42:252
214422470,2sleep20-21swapper/211:42:252
293762450,3sleep20-21swapper/210:37:212
260932450,2sleep026091-21grep09:02:160
260932450,2sleep026091-21grep09:02:160
114342440,2sleep20-21swapper/209:47:322
114342440,2sleep20-21swapper/209:47:322
64642430,2sleep16505-21tail12:27:321
64642430,2sleep16505-21tail12:27:321
64642430,2sleep16505-21tail12:27:321
93502420,3chrt0-21swapper/311:07:373
93502420,3chrt0-21swapper/311:07:373
130272410,3sleep30-21swapper/309:52:283
326322400,2sleep10-21swapper/109:17:341
17590994031,6cyclictest25469-21latency_hist10:27:140
17590994031,6cyclictest25469-21latency_hist10:27:140
12562400,2sleep017584-21cyclictest07:52:370
12562400,2sleep017584-21cyclictest07:52:370
291812390,4chrt0-21swapper/212:02:272
291812390,4chrt0-21swapper/212:02:272
17591993832,4cyclictest1-21systemd12:02:141
17591993832,4cyclictest1-21systemd12:02:141
1759099388,11cyclictest7045-21sed12:27:380
1759099388,11cyclictest7045-21sed12:27:380
1759099388,11cyclictest7045-21sed12:27:380
97782370,4sleep20-21swapper/209:42:342
97782370,4sleep20-21swapper/209:42:342
46142350,2sleep04615-21grep08:02:340
46142350,2sleep04615-21grep08:02:340
17591993529,4cyclictest31638-21latency_hist09:17:141
17591993429,4cyclictest26009-21latency_hist09:02:141
17591993429,4cyclictest26009-21latency_hist09:02:141
17591993425,7cyclictest29402-21netstat07:42:331
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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