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2026-03-27 - 05:31

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #b, slot #7

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.

Note that this system runs a non-RT kernel.
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 rackbslot7s.osadl.org (updated Fri Mar 27, 2026 00:43:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
26710229866,2968sleep225187-21kworker/2:222:55:472
30572193624,1896sleep03948-21kworker/u8:421:22:520
18743267315,640sleep018776-21irqstats00:12:470
8967259574,447sleep28996-21idleruntime-cro21:42:252
15805244822,411sleep215841-21ntpq00:02:512
15805244822,411sleep215841-21ntpq00:02:512
591723560,148sleep224562-21cyclictest21:32:262
12263232721,294sleep212299-21ntpq20:07:502
229722324118,190sleep223108-21latency_hist00:27:272
24112231840,211sleep224261-21latency_hist20:47:282
25167230210,276sleep025206-21ntpq19:07:500
494522830,31sleep224562-21cyclictest23:28:022
1859422787,237sleep218677-21fschecks_time00:12:452
16333223810,135sleep216415-21latency_hist20:22:282
16333223810,135sleep216415-21latency_hist20:22:282
27146223512,166sleep227149-21cron20:57:262
27146223512,166sleep227149-21cron20:57:262
26160222610,204sleep126234-21cat20:52:481
26160222610,204sleep126234-21cat20:52:481
2178222216,191sleep12181-21entropy19:37:441
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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