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2026-05-03 - 22:59

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 Sun May 03, 2026 12:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
598221110,2sleep30-21swapper/309:52:373
598221110,2sleep30-21swapper/309:52:373
598221110,2sleep30-21swapper/309:52:373
79332720,2chrt7937-21missed_timers08:32:300
256272710,4sleep10-21swapper/112:12:331
256272710,4sleep10-21swapper/112:12:331
307772700,4chrt30780-21fschecks_time12:27:281
308842660,3sleep20-21swapper/211:02:152
308842660,3sleep20-21swapper/211:02:152
203772580,3sleep30-21swapper/307:37:383
203772580,3sleep30-21swapper/307:37:383
175932560,3sleep10-21swapper/108:57:361
175932560,3sleep10-21swapper/108:57:361
7832550,2chrt0-21swapper/112:32:341
7832550,2chrt0-21swapper/112:32:341
307282520,2chrt30729-21/usr/sbin/munin09:32:360
326532500,2sleep032760-21sed08:12:290
326532500,2sleep032760-21sed08:12:290
155272490,2sleep015520-21tail08:52:320
155272490,2sleep015520-21tail08:52:320
987799471,30cyclictest17162-21taskset11:51:280
987799471,30cyclictest17162-21taskset11:51:280
987799471,30cyclictest17162-21taskset11:51:280
987799461,30cyclictest26370-21taskset12:14:530
987799461,30cyclictest26370-21taskset12:14:530
987799461,30cyclictest10196-21chrt10:05:480
987799461,30cyclictest10196-21chrt10:05:480
987799461,29cyclictest23314-21taskset10:41:120
987799461,29cyclictest23314-21taskset10:41:120
66682460,2sleep10-21swapper/109:57:251
66682460,2sleep10-21swapper/109:57:251
66682460,2sleep10-21swapper/109:57:251
987799451,31cyclictest20160-21taskset09:06:140
987799451,31cyclictest20160-21taskset09:06:140
987799451,31cyclictest20160-21taskset09:06:140
987799451,29cyclictest25657-21chrt09:19:460
987799451,29cyclictest25657-21chrt09:19:460
987799451,28cyclictest749-21runrttasks08:50:550
987799450,29cyclictest28096-21taskset12:18:060
987799450,29cyclictest28096-21taskset12:18:060
83652450,3chrt0-21swapper/208:32:362
106482450,2sleep30-21swapper/310:07:283
106482450,2sleep30-21swapper/310:07:283
106482450,2sleep30-21swapper/310:07:283
987799441,31cyclictest24667-21taskset12:11:550
987799441,31cyclictest24667-21taskset12:11:550
987799441,31cyclictest24667-21taskset12:11:550
987799441,30cyclictest5742-21taskset11:19:350
987799441,30cyclictest5742-21taskset11:19:350
987799441,30cyclictest5742-21taskset11:19:350
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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