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OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, 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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  Eltec
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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
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rack3slot5s.osadl.org (updated Wed Dec 31, 2025 00:43:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
125792820sleep0121650irq/29-eth0_g0_22:56:110
25752620sleep1121750irq/30-eth0_g0_22:15:181
186802600sleep0121750irq/30-eth0_g0_23:20:430
121650600irq/29-eth0_g0_2126599cyclictest23:05:190
211902590sleep1121750irq/30-eth0_g0_23:31:231
121750540irq/30-eth0_g0_2126599cyclictest23:25:120
121650530irq/29-eth0_g0_2126599cyclictest20:55:140
177262520sleep0121750irq/30-eth0_g0_23:18:550
121650520irq/29-eth0_g0_2126599cyclictest23:54:090
311832500sleep0121650irq/29-eth0_g0_00:13:200
287362490chrt121750irq/30-eth0_g0_00:03:260
121750490irq/30-eth0_g0_2126599cyclictest00:21:550
121490ksoftirqd/1121750irq/30-eth0_g0_23:48:451
121650480irq/29-eth0_g0_2126599cyclictest23:14:490
121650480irq/29-eth0_g0_2126599cyclictest21:59:140
121480ksoftirqd/1121750irq/30-eth0_g0_21:37:591
21265994724cyclictest26205-21latency_hist19:29:560
121650470irq/29-eth0_g0_2126599cyclictest22:40:430
121650470irq/29-eth0_g0_2126599cyclictest22:40:430
121650470irq/29-eth0_g0_20808-21unixbench_singl19:05:190
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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