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2026-09-11 - 12:20

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 here to display the system's profile data or here to proceed to next system.
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 Fri Sep 11, 2026 00:44:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
604721260,2sleep0171ktimers/020:09:260
80621170,3sleep10-21swapper/100:14:291
80621170,3sleep10-21swapper/100:14:291
64521080,2sleep10-21swapper/119:54:271
872021000,3sleep1271rcuc/100:34:311
323912940,1sleep132392-21ntp_kernel_err22:44:321
323912940,1sleep132392-21ntp_kernel_err22:44:321
38332750,3sleep10-21swapper/121:29:271
38332750,3sleep10-21swapper/121:29:271
307852730,3sleep00-21swapper/021:14:260
307552710,2sleep030759-21switchtime22:39:370
307552710,2sleep030759-21switchtime22:39:370
114222640,2sleep10-21swapper/120:24:141
114222640,2sleep10-21swapper/120:24:141
257252610,2chrt25724-21switchtime20:59:361
257252610,2chrt25724-21switchtime20:59:361
153192610,4sleep30-21swapper/321:59:283
153192610,4sleep30-21swapper/321:59:283
117532600,3sleep30-21swapper/321:49:313
117532600,3sleep30-21swapper/321:49:313
259032560,3sleep30-21swapper/323:54:293
244842550,3sleep30-21swapper/323:49:343
117732550,2chrt11771-21entropy20:24:250
263012520,2sleep026304-21fschecks_time22:29:280
263012520,2sleep026304-21fschecks_time22:29:280
168882510,2sleep016884-21tune2fs22:04:270
293362500,3chrt0-21swapper/300:04:263
246122500,3chrt0-21swapper/220:59:172
172982490,4sleep30-21swapper/322:04:303
35822470,3sleep30-21swapper/321:29:253
35822470,3sleep30-21swapper/321:29:253
291942470,3sleep10-21swapper/100:04:241
291942470,3sleep10-21swapper/100:04:241
311152460,8sleep131114-21grep21:14:311
303862460,3sleep30-21swapper/300:04:383
303862460,3sleep30-21swapper/300:04:383
111282460,3sleep129-21ksoftirqd/121:49:251
111282460,3sleep129-21ksoftirqd/121:49:251
287882450,7sleep0171ktimers/021:09:280
287882450,7sleep0171ktimers/021:09:280
210182450,3sleep20-21swapper/223:39:372
210182450,3sleep20-21swapper/223:39:372
210182450,3sleep20-21swapper/223:39:372
306192440,2sleep30-21swapper/321:14:253
86022420,4sleep30-21swapper/300:34:293
305292420,2sleep10-21swapper/122:39:341
305292420,2sleep10-21swapper/122:39:341
239012410,2sleep10-21swapper/119:29:271
239012410,2sleep10-21swapper/119:29:271
291252400,4chrt0-21swapper/321:09:313
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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