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2026-09-23 - 01:59

OSADL QA Farm on Real-time of Mainline Linux

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

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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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
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rackaslot5s.osadl.org (updated Fri Sep 18, 2026 00:43:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
81860,0rcu_preempt14470-1kworker/0:4H21:23:380
81830,0rcu_preempt3-21ksoftirqd/023:00:340
81820,0rcu_preempt7433-1kworker/0:4H19:45:010
81800,0rcu_preempt4633-1kworker/0:1H19:39:590
81700,0rcu_preempt1020-1kworker/0:2H22:20:020
81670,0rcu_preempt7433-1kworker/0:4H19:45:340
81670,0rcu_preempt7433-1kworker/0:4H19:45:340
81660,0rcu_preempt19-21ksoftirqd/122:11:441
9950620,0irq/345-484840019-21ksoftirqd/121:20:051
81600,0rcu_preempt3-21ksoftirqd/021:20:000
312202600,0chrt9950irq/345-484840022:53:420
81590,0rcu_preempt19-21ksoftirqd/100:07:541
81590,0rcu_preempt12537-1kworker/1:2H00:25:241
10050590,0irq/346-484840019059-21grep22:40:130
10050590,0irq/346-484840019059-21grep22:40:130
10050580,0irq/346-48484001338-1kworker/0:1H23:49:230
9950570,0irq/345-484840019-21ksoftirqd/122:20:471
10050560,0irq/346-484840021234-1kworker/0:5H22:58:280
81550,0rcu_preempt854-1kworker/0:3H19:30:010
81550,0rcu_preempt3-21ksoftirqd/020:20:000
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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