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2026-01-10 - 01:57

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, 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 20 highest latencies:
System rack0slot1s.osadl.org (updated Thu Jan 08, 2026 12:45:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3106999125122,3cyclictest37-21ksoftirqd/311:48:413
3106599109109,0cyclictest192950irq/36-eth1-rx-11:48:562
3107699104103,1cyclictest0-21swapper/411:38:274
3105999102102,0cyclictest192950irq/36-eth1-rx-09:16:191
31093999796,1cyclictest0-21swapper/711:20:567
31048999494,0cyclictest192950irq/36-eth1-rx-11:38:270
31065998484,0cyclictest29-21ksoftirqd/210:17:542
31059996666,0cyclictest21-21ksoftirqd/111:40:001
3069626241,18sleep70-21swapper/707:07:497
3069526141,17sleep60-21swapper/607:07:486
31086995655,1cyclictest0-21swapper/611:48:566
3069424222,17sleep50-21swapper/507:07:485
3069324230,8sleep40-21swapper/407:07:474
2995724221,17sleep20-21swapper/207:05:202
31076994038,1cyclictest192950irq/36-eth1-rx-08:56:564
31093993937,1cyclictest0-21swapper/708:37:457
300742390,0sleep50-21swapper/510:40:155
3068923717,17sleep00-21swapper/007:07:430
3073723615,18sleep10-21swapper/107:08:241
3053723616,17sleep30-21swapper/307:05:373
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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