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2026-07-09 - 22:39

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 Thu Jul 09, 2026 12:44:18)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
296221240,3sleep02964-21fschecks_time10:03:290
1528421230,2sleep015287-21sort12:03:250
1528421230,2sleep015287-21sort12:03:250
1528421230,2sleep015287-21sort12:03:250
2573921100,3sleep30-21swapper/309:38:243
2573921100,3sleep30-21swapper/309:38:243
586421080,3sleep30-21swapper/310:08:393
132192980,3sleep00-21swapper/009:03:310
132192980,3sleep00-21swapper/009:03:310
293352850,2sleep20-21swapper/208:18:392
302982790,3sleep20-21swapper/209:48:362
302982790,3sleep20-21swapper/209:48:362
302982790,3sleep20-21swapper/209:48:362
172802770,3sleep30-21swapper/312:08:263
172802770,3sleep30-21swapper/312:08:263
236862700,3sleep20-21swapper/212:23:372
236862700,3sleep20-21swapper/212:23:372
236862700,3sleep20-21swapper/212:23:372
179602690,3chrt0-21swapper/212:08:332
179602690,3chrt0-21swapper/212:08:332
208992670,2sleep020781-21/usr/sbin/munin07:58:280
208992670,2sleep020781-21/usr/sbin/munin07:58:280
273302660,2sleep027331-21/usr/sbin/munin12:33:360
273302660,2sleep027331-21/usr/sbin/munin12:33:360
117652610,3sleep30-21swapper/307:33:303
117652610,3sleep30-21swapper/307:33:303
103172580,4chrt0-21swapper/207:28:342
103172580,4chrt0-21swapper/207:28:342
88312560,3sleep20-21swapper/210:18:322
35992520,3chrt0-21swapper/208:38:292
35992520,3chrt0-21swapper/208:38:292
203122520,3sleep20-21swapper/209:23:272
203122520,3sleep20-21swapper/209:23:272
203122520,3sleep20-21swapper/209:23:272
233842500,3sleep00-21swapper/008:03:330
233842500,3sleep00-21swapper/008:03:330
226962490,3sleep20-21swapper/210:53:402
226962490,3sleep20-21swapper/210:53:402
226962490,3sleep20-21swapper/210:53:402
178852430,2sleep20-21swapper/210:43:272
178852430,2sleep20-21swapper/210:43:272
65082420,3sleep20-21swapper/208:43:392
65082420,3sleep20-21swapper/208:43:392
291232420,3sleep30-21swapper/312:38:333
268382420,2sleep30-21swapper/309:38:373
268382420,2sleep30-21swapper/309:38:373
4370994033,5cyclictest30769-21/usr/sbin/munin11:18:300
4370994033,5cyclictest30769-21/usr/sbin/munin11:18:300
4370994033,5cyclictest30769-21/usr/sbin/munin11:18:300
199092400,3sleep20-21swapper/210:48:292
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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