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2026-07-18 - 22:17

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #4

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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  Intel
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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: ondemand
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rack5slot4s.osadl.org (updated Sat Jul 18, 2026 12:44:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
320914921980,2sleep3451irq_work/312:12:323
292333721640,3sleep3584-21kworker/3:2-events07:27:293
299412121070,4sleep2371rcuc/208:37:332
299412121070,4sleep2371rcuc/208:37:332
2905518995953,4cyclictest2073007-21kworker/u8:2+flush-8:007:42:260
2905519995548,5cyclictest2073007-21kworker/u8:2+events_unbound07:27:381
2905519995446,6cyclictest3130917-21kworker/u8:1+flush-8:011:10:001
2905519995346,5cyclictest3050828-21kworker/u8:3+flush-8:010:47:371
2905519995346,5cyclictest2991725-21kworker/u8:1+flush-8:008:52:391
2905519995345,6cyclictest2545837-21kworker/u8:4+flush-8:007:47:411
2905523995035,13cyclictest281-21systemd-journal10:35:002
2905519995043,5cyclictest2967185-21kworker/u8:0+flush-8:009:17:431
2905519995041,7cyclictest2073007-21kworker/u8:2+flush-8:008:22:421
2905519995041,6cyclictest3071398-21latency_hist09:55:011
2905518995038,9cyclictest2990921-21ntpq08:32:340
2905519994943,5cyclictest2991725-21kworker/u8:1+flush-8:009:22:311
2905519994941,6cyclictest2991725-21kworker/u8:1+flush-8:008:57:391
2905519994840,6cyclictest2798536-21kworker/u8:0+events_unbound07:15:021
2905518994742,4cyclictest2927146-21kworker/u8:1+flush-8:007:30:000
2905518994736,9cyclictest3060688-21ntpq09:42:340
2905519994641,4cyclictest3165561-21kworker/u8:0+events_unbound11:37:341
2905519994641,4cyclictest3165561-21kworker/u8:0+events_unbound11:37:341
2905519994638,6cyclictest2967185-21kworker/u8:0+flush-8:009:02:371
2905519994541,2cyclictest3195690-21kworker/u8:0+events_unbound12:32:311
2905519994538,5cyclictest2967185-21kworker/u8:0+flush-8:008:17:371
2905519994538,4cyclictest3195690-21kworker/u8:0+events_unbound12:05:011
2905518994538,5cyclictest2937296-21latency_hist07:40:000
2905518994535,7cyclictest3215455-21latency_hist12:20:010
2905518994533,9cyclictest2932086-21latency_hist07:35:010
2905519994438,5cyclictest2545837-21kworker/u8:4+flush-8:008:02:371
2905519994436,6cyclictest3145986-21kworker/u8:3+flush-8:011:57:371
2905518994435,6cyclictest3140805-21latency_hist11:05:010
2905519994336,5cyclictest3050828-21kworker/u8:3+flush-8:010:32:431
2905519994330,3cyclictest2545837-21kworker/u8:4+flush-8:007:42:401
2905518994334,7cyclictest3022524-21diskstats09:07:270
30265312420,2sleep3471rcuc/309:07:433
2905519994236,4cyclictest3076561-21kworker/u8:0+events_unbound10:07:261
2905519994136,4cyclictest3050828-21kworker/u8:3+flush-8:009:42:251
2905519994135,4cyclictest3076561-21kworker/u8:0+flush-8:011:02:321
2905519994135,4cyclictest2545837-21kworker/u8:4+flush-8:007:57:301
2905519994134,5cyclictest3145986-21kworker/u8:3+flush-8:011:12:271
2905523994036,3cyclictest2545837-21kworker/u8:4+flush-8:007:57:272
2905519994035,4cyclictest3195690-21kworker/u8:0+events_unbound12:17:281
2905519994035,4cyclictest3061471-21kworker/u8:2+flush-8:011:22:281
2905519994035,4cyclictest2991725-21kworker/u8:1+flush-8:009:27:401
2905519994035,4cyclictest2967185-21kworker/u8:0+flush-8:008:32:281
2905519994035,4cyclictest2967185-21kworker/u8:0+events_unbound08:50:021
2905519994034,4cyclictest3076561-21kworker/u8:0+flush-8:010:57:311
2905519994034,4cyclictest3031739-21kworker/u8:2+flush-8:009:37:411
2905519994034,4cyclictest2545837-21kworker/u8:4+flush-8:008:12:401
2905519994033,5cyclictest3145986-21kworker/u8:3+flush-8:011:52:381
2905519994032,6cyclictest3220833-21/usr/sbin/munin12:27:351
2905519994031,7cyclictest2928279-21irqrtprio07:32:281
2905523993933,3cyclictest3076561-21kworker/u8:0+events_unbound10:10:022
2905523993929,8cyclictest281-21systemd-journal10:00:002
2905519993933,4cyclictest3061471-21kworker/u8:2+flush-8:010:17:431
2905518993929,7cyclictest281-21systemd-journal12:35:000
2905519993833,3cyclictest3061471-21kworker/u8:2+flush-8:011:27:301
2905519993832,4cyclictest2073007-21kworker/u8:2+flush-8:007:37:321
2905519993831,5cyclictest3190280-21kworker/u8:1+flush-8:012:37:351
2905519993831,5cyclictest3190280-21kworker/u8:1+flush-8:012:37:351
2905518993834,3cyclictest3076561-21kworker/u8:0+flush-8:010:09:000
2905523993732,4cyclictest3001142-21kworker/u8:2+flush-8:008:42:352
2905519993731,5cyclictest3190280-21kworker/u8:1+flush-8:012:22:361
2905519993731,4cyclictest2991725-21kworker/u8:1+events_unbound09:15:011
2905519993730,5cyclictest3050828-21kworker/u8:3+flush-8:010:22:371
2905518993733,3cyclictest3056273-21kworker/u8:1+flush-8:009:57:260
2905518993728,6cyclictest2971890-21latency_hist08:15:010
2905519993631,3cyclictest3001142-21kworker/u8:2+events_unbound08:42:381
2905519993629,5cyclictest3061471-21kworker/u8:2+events_unbound10:12:371
2905519993629,5cyclictest2798536-21kworker/u8:0+flush-8:007:12:271
2905518993629,5cyclictest3016917-21latency_hist09:00:010
2905519993529,4cyclictest3145986-21kworker/u8:3+flush-8:011:47:301
2905519993529,4cyclictest3056273-21kworker/u8:1+flush-8:009:47:281
2905519993528,5cyclictest2073007-21kworker/u8:2+flush-8:008:27:351
2905519993430,3cyclictest3190280-21kworker/u8:1+flush-8:012:05:311
2905519993430,3cyclictest3190280-21kworker/u8:1+events_unbound12:12:331
2905519993427,5cyclictest3061471-21kworker/u8:2+flush-8:009:57:361
2905519993427,5cyclictest3022275-21apt-get09:07:231
2905519993426,6cyclictest3061471-21kworker/u8:2+flush-8:011:17:381
2905519993420,10cyclictest3115828-21awk10:40:001
2905518993325,6cyclictest281-21systemd-journal08:40:000
2905518993324,7cyclictest3011752-21apt-get08:55:000
2905518993324,6cyclictest2976886-21latency_hist08:20:010
2905523993228,3cyclictest2972123-21kworker/u8:3+flush-8:008:27:452
2905523993227,4cyclictest2967185-21kworker/u8:0+flush-8:009:32:312
2905523993227,4cyclictest2967185-21kworker/u8:0+flush-8:009:32:312
2905519993229,2cyclictest2073007-21kworker/u8:2+events_unbound07:20:421
2905519993226,4cyclictest2545837-21kworker/u8:4+flush-8:007:52:341
2905519993224,6cyclictest3061471-21kworker/u8:2+flush-8:010:42:321
2905518993227,3cyclictest2947246-21systemd-run07:50:010
2905523993127,3cyclictest2910536-21install07:15:012
2905519993126,4cyclictest3145986-21kworker/u8:3+flush-8:011:42:311
2905519993126,4cyclictest2991725-21kworker/u8:1+flush-8:009:30:301
2905519993126,4cyclictest2991725-21kworker/u8:1+flush-8:009:30:301
2905518993125,5cyclictest3061471-21kworker/u8:2+flush-8:012:38:540
2905518993125,5cyclictest3061471-21kworker/u8:2+flush-8:012:38:540
290551899310,28cyclictest2953090-21sshd07:57:300
2905523993024,4cyclictest3052028-21aten2_r5power_p09:37:252
2905523993022,6cyclictest2966673-21unixbench_multi08:07:422
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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