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2026-04-13 - 22:02

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 Mon Apr 13, 2026 12:44:13)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2308221290,2sleep023085-21sed10:02:110
2308221290,2sleep023085-21sed10:02:110
131172930,2sleep00-21swapper/009:37:030
131172930,2sleep00-21swapper/009:37:030
17422770,3sleep20-21swapper/210:32:122
17422770,3sleep20-21swapper/210:32:122
64052650,3chrt0-21swapper/210:42:212
64052650,3chrt0-21swapper/210:42:212
64052650,3chrt0-21swapper/210:42:212
64052650,3chrt0-21swapper/210:42:212
228892650,3chrt0-21swapper/308:36:563
153392630,3sleep10-21swapper/108:16:041
153392630,3sleep10-21swapper/108:16:041
178152580,3chrt0-21swapper/209:47:182
178152580,3chrt0-21swapper/209:47:182
35262570,3chrt0-21swapper/210:37:112
35262570,3chrt0-21swapper/210:37:112
35262570,3chrt0-21swapper/210:37:112
263432550,4sleep20-21swapper/211:37:122
263432550,4sleep20-21swapper/211:37:122
128892550,4sleep2351rcuc/212:27:172
128892550,4sleep2351rcuc/212:27:172
48162540,3chrt0-21swapper/312:07:083
48162540,3chrt0-21swapper/312:07:083
223732500,3sleep30-21swapper/310:01:583
223732500,3sleep30-21swapper/310:01:583
100602490,3sleep20-21swapper/212:22:032
100602490,3sleep20-21swapper/212:22:032
100602490,3sleep20-21swapper/212:22:032
184262470,3chrt0-21swapper/008:22:180
184262470,3chrt0-21swapper/008:22:180
264302460,1sleep10-21swapper/111:37:161
264302460,1sleep10-21swapper/111:37:161
164452460,4sleep20-21swapper/212:37:142
164452460,4sleep20-21swapper/212:37:142
164452460,4sleep20-21swapper/212:37:142
105462450,3chrt0-21swapper/310:56:573
105462450,3chrt0-21swapper/310:56:573
82372430,3sleep30-21swapper/307:57:083
82372430,3sleep30-21swapper/307:57:083
82372430,3sleep30-21swapper/307:57:083
66982410,3sleep20-21swapper/212:12:102
66982410,3sleep20-21swapper/212:12:102
283432410,1sleep128462-21switchtime07:22:181
283432410,1sleep128462-21switchtime07:22:181
147062400,2sleep014788-21/usr/sbin/munin08:12:180
147062400,2sleep014788-21/usr/sbin/munin08:12:180
23830993831,5cyclictest5449-21threads07:47:180
23830993831,5cyclictest5449-21threads07:47:180
296632370,3sleep30-21swapper/308:52:193
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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