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2026-10-06 - 23:16

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 20 highest latencies:
System rack5slot4s.osadl.org (updated Tue Oct 06, 2026 12:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
126951521880,2sleep3481ktimers/309:48:583
116586721070,5sleep3451irq_work/308:05:003
13835772920,7chrt0-21swapper/211:43:582
13046682750,5sleep20-21swapper/210:24:042
13046682750,5sleep20-21swapper/210:24:042
12325292740,3chrt75-21kworker/3:1+events09:13:543
13758712570,3sleep0161rcu_preempt11:38:500
1109261995549,4cyclictest771361-21kworker/u8:5+flush-8:007:20:000
1109265995445,6cyclictest278-21systemd-journal11:25:001
1109261995141,8cyclictest1240620-21cp09:20:000
1109261995042,5cyclictest1275371-21latency_hist09:55:010
13311732490,3sleep375-21kworker/3:1+events10:53:513
1109267994843,3cyclictest1350328-21kworker/u8:2+flush-8:012:23:512
1109265994842,4cyclictest1300363-21kworker/u8:1+events_unbound10:53:531
1109265994839,6cyclictest1109098-21latency_hist07:10:011
1109265994737,8cyclictest771361-21kworker/u8:5+flush-8:007:19:011
1109267994642,3cyclictest1146306-21kworker/u8:1+events_unbound07:49:002
1109267994641,3cyclictest1190709-21kworker/u8:1+events_unbound09:53:492
1109267994541,3cyclictest771361-21kworker/u8:5+events_unbound07:15:042
110926199457,19cyclictest0-21swapper/009:38:490
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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