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2025-07-01 - 08:17

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, slot #3

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 rack7slot3s.osadl.org (updated Mon Jun 30, 2025 12:43:37)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
87859910431,37cyclictest0-21swapper/008:00:260
87859910431,37cyclictest0-21swapper/008:00:260
323742970,5sleep1878699cyclictest08:15:231
115752860,2sleep30-21swapper/311:57:183
878599857,25cyclictest0-21swapper/009:45:270
320752800,5sleep2878799cyclictest12:22:092
878599792,38cyclictest0-21swapper/011:35:260
315572790,2sleep337-21rcuc/310:12:593
8786997744,12cyclictest23-21ksoftirqd/110:45:251
878599749,53cyclictest975-21missed_timers10:15:370
878599749,53cyclictest975-21missed_timers10:15:370
878599738,48cyclictest13691-21unixbench_multi08:50:430
131082730,1sleep00-21swapper/012:00:090
878599697,48cyclictest11303-21ntpq07:15:340
878599697,46cyclictest16308-21unixbench-2d09:50:440
878599695,50cyclictest10995-21taskset11:15:320
8785996928,3cyclictest0-21swapper/008:25:240
878599691,54cyclictest22652-21grep10:45:430
878799672,51cyclictest0-21swapper/210:40:322
8787996723,26cyclictest30138-21apt-get09:25:162
878599676,58cyclictest0-21swapper/010:55:160
878599675,50cyclictest6342-21timerandwakeup11:50:420
197332670,3sleep10-21swapper/109:55:381
878599669,33cyclictest0-21swapper/008:35:250
878599661,52cyclictest29434-21cpu10:10:290
8785996614,23cyclictest22384-21sh10:00:260
878599658,12cyclictest0-21swapper/007:30:270
195532650,2sleep00-21swapper/011:27:200
8785996420,26cyclictest21084-21munin-plugin-st10:45:100
878599641,48cyclictest24053-21/usr/sbin/munin07:50:390
293752640,2sleep00-21swapper/012:19:450
878799636,45cyclictest7950irq/56-dwc_otg_07:10:272
878599635,33cyclictest0-21swapper/009:15:270
878599631,32cyclictest19131-21grep09:05:430
878899624,15cyclictest7950irq/56-dwc_otg_12:20:283
878799629,44cyclictest8050irq/56-dwc_otg_11:15:372
878799621,6cyclictest19016-21timerwakeupswit09:05:422
878599622,29cyclictest2881-21rm12:25:400
878799615,4cyclictest8050irq/56-dwc_otg_10:15:442
878799615,4cyclictest8050irq/56-dwc_otg_10:15:442
878599611,34cyclictest0-21swapper/011:20:250
878799601,4cyclictest7850irq/56-dwc_otg10:10:162
878799598,40cyclictest0-21swapper/212:16:022
878799597,4cyclictest0-21swapper/211:57:462
8787995910,34cyclictest0-21swapper/209:45:082
878599599,35cyclictest18832-21switchtime07:35:360
8785995938,8cyclictest0-21swapper/009:25:210
878599592,45cyclictest0-21swapper/007:43:400
878599590,48cyclictest32423-21runrttasks08:15:260
878799581,3cyclictest7950irq/56-dwc_otg_11:10:342
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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