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2026-03-26 - 16:26

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 Mar 26, 2026 12:44:12)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2665521160,2chrt0-21swapper/112:16:401
2665521160,2chrt0-21swapper/112:16:401
117521060,3sleep032350-21/usr/sbin/munin08:12:010
117521060,3sleep032350-21/usr/sbin/munin08:12:010
3256421000,3chrt0-21swapper/208:11:512
3256421000,3chrt0-21swapper/208:11:512
276602940,2chrt0-21swapper/010:51:520
276602940,2chrt0-21swapper/010:51:520
293792900,4sleep20-21swapper/208:01:582
293792900,4sleep20-21swapper/208:01:582
104462740,1chrt10443-21cron10:06:391
104462740,1chrt10443-21cron10:06:391
67082710,3sleep16710-21cat08:27:021
260722710,2sleep30-21swapper/307:52:023
260722710,2sleep30-21swapper/307:52:023
233222620,5sleep023326-21gltestperf07:46:530
233222620,5sleep023326-21gltestperf07:46:530
213542610,3sleep20-21swapper/209:06:582
213542610,3sleep20-21swapper/209:06:582
184672610,2chrt18469-21grep11:51:591
247662580,2chrt0-21swapper/109:16:541
247662580,2chrt0-21swapper/109:16:541
247662580,2chrt0-21swapper/109:16:541
270682570,2sleep20-21swapper/207:56:522
270682570,2sleep20-21swapper/207:56:522
270682570,2sleep20-21swapper/207:56:522
173882510,3sleep30-21swapper/311:51:413
202212500,2sleep20-21swapper/210:31:532
202212500,2sleep20-21swapper/210:31:532
154612500,3sleep20-21swapper/210:17:012
154612500,3sleep20-21swapper/210:17:012
93032470,3chrt0-21swapper/210:01:542
93032470,3chrt0-21swapper/210:01:542
200122470,2sleep020010-21/usr/sbin/munin10:31:520
200122470,2sleep020010-21/usr/sbin/munin10:31:520
283982460,2sleep30-21swapper/308:01:393
283982460,2sleep30-21swapper/308:01:393
283982460,2sleep30-21swapper/308:01:393
315112420,2sleep131623-21sort12:27:021
315112420,2sleep131623-21sort12:27:021
225562410,3sleep30-21swapper/309:11:503
242102400,3sleep20-21swapper/210:41:542
242102400,3sleep20-21swapper/210:41:542
206972400,3chrt0-21swapper/310:31:583
206972400,3chrt0-21swapper/310:31:583
129662400,3sleep00-21swapper/010:11:530
51982390,3sleep20-21swapper/211:16:592
51982390,3sleep20-21swapper/211:16:592
125802390,3sleep00-21swapper/011:36:550
125802390,3sleep00-21swapper/011:36:550
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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