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2026-08-31 - 22:39

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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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 50 highest latencies:
System rack5slot4s.osadl.org (updated Mon Aug 31, 2026 12:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
309796022210,5sleep30-21swapper/309:32:463
29525962930,5chrt2952593-21latency_hist07:10:010
2952682995247,3cyclictest3222396-21kworker/u8:1+events_unbound11:40:001
2952675994940,6cyclictest3053850-21latency_hist08:50:000
2952675994940,6cyclictest3053850-21latency_hist08:50:000
2952682994842,4cyclictest2895586-21kworker/u8:0+flush-8:007:45:011
29907482470,5sleep00-21swapper/007:47:370
2952682994639,5cyclictest2974654-21kworker/u8:3+flush-8:007:57:321
2952682994531,10cyclictest275-21systemd-journal08:35:001
2952682994438,4cyclictest2154645-21kworker/u8:1+events_unbound09:12:331
2952682994336,5cyclictest3103528-21kworker/u8:3+flush-8:009:42:481
2952682994237,4cyclictest2154645-21kworker/u8:1+events_unbound08:40:001
2952682994237,3cyclictest2974654-21kworker/u8:3+events_unbound08:17:471
2952682994136,4cyclictest2154645-21kworker/u8:1+flush-8:007:52:491
2952682994136,3cyclictest2154645-21kworker/u8:1+events_unbound07:17:321
2952682994134,5cyclictest3103252-21latency_hist09:40:011
2952682994129,6cyclictest3162631-21kworker/u8:1+events_unbound11:07:311
29477512414,33sleep20-21swapper/207:05:542
2952682994034,4cyclictest3034269-21kworker/u8:2+flush-8:008:57:431
2952682994033,5cyclictest3103528-21kworker/u8:3+flush-8:010:02:301
2952682994033,5cyclictest2154645-21kworker/u8:1+flush-8:008:22:421
2952675994032,5cyclictest275-21systemd-journal11:25:000
2952682993934,4cyclictest3083687-21kworker/u8:0+flush-8:010:07:321
2952682993933,4cyclictest3198052-21kworker/u8:2+flush-8:011:32:431
2952682993933,4cyclictest3103528-21kworker/u8:3+events_unbound12:17:481
2952682993933,4cyclictest2154645-21kworker/u8:1+events_unbound09:25:011
2952682993932,5cyclictest3103528-21kworker/u8:3+flush-8:010:52:461
2952682993932,5cyclictest2895586-21kworker/u8:0+flush-8:008:07:481
2952682993832,4cyclictest3272787-21apt-get12:31:341
2952682993832,4cyclictest3198052-21kworker/u8:2+flush-8:011:22:391
2952682993832,4cyclictest2154645-21kworker/u8:1+flush-8:007:47:301
2952682993831,5cyclictest3266897-21kworker/u8:0+flush-8:012:27:421
31347932370,4sleep3471rcuc/310:12:353
2952682993731,4cyclictest3034269-21kworker/u8:2+events_unbound09:07:481
2952682993731,4cyclictest2895586-21kworker/u8:0+flush-8:008:42:331
2952682993729,5cyclictest3257083-21kworker/u8:4+flush-8:012:15:011
2952675993732,4cyclictest3118030-21kworker/u8:2+events_unbound10:17:350
2952682993628,6cyclictest2154645-21kworker/u8:1+flush-8:009:02:421
29477452364,9sleep10-21swapper/107:05:491
2952684993529,4cyclictest3257083-21kworker/u8:4+flush-8:012:22:492
2952682993530,4cyclictest2154645-21kworker/u8:1+events_unbound07:22:441
2952682993528,5cyclictest3048728-21kworker/u8:3+flush-8:008:55:001
2952682993527,6cyclictest3093785-21/usr/sbin/munin09:32:421
2952682993526,7cyclictest2970628-21irqrtprio07:27:361
2952675993526,6cyclictest275-21systemd-journal11:50:010
2952684993428,4cyclictest2974219-21unixbench_singl07:27:492
2952682993429,4cyclictest2895586-21kworker/u8:0+events_unbound07:32:461
2952682993429,3cyclictest3222396-21kworker/u8:1+flush-8:011:57:391
2952682993428,4cyclictest3083687-21kworker/u8:0+flush-8:009:57:571
2952682993328,4cyclictest3162631-21kworker/u8:1+events_unbound11:12:421
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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