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2025-05-05 - 01:00

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, slot #3

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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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: performance
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rack7slot3s.osadl.org (updated Sun May 04, 2025 12:43:36)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2744122300,3sleep10-21swapper/107:10:171
673121480,5sleep32748299cyclictest11:26:513
27458991022,43cyclictest0-21swapper/009:30:310
180972910,1sleep00-21swapper/010:59:340
180972910,1sleep00-21swapper/010:59:340
2745899866,21cyclictest0-21swapper/007:30:320
2745899844,44cyclictest5518-21ssh12:05:300
2745899844,44cyclictest5518-21ssh12:05:300
2745899823,15cyclictest16852-21sshd10:10:390
2745899811,60cyclictest14333-21sh12:15:370
2745899801,57cyclictest0-21swapper/012:20:300
2745899801,56cyclictest23435-21grep10:20:350
2745899791,58cyclictest4255-21grep09:05:320
260462790,2sleep10-21swapper/112:30:181
27458997818,14cyclictest0-21swapper/009:45:320
2745899771,55cyclictest9705-21/usr/sbin/munin11:30:400
162872770,2sleep10-21swapper/110:10:321
27458997622,34cyclictest7950irq/56-dwc_otg_10:30:450
2745899761,55cyclictest19445-21cat08:15:480
2745899761,55cyclictest19445-21cat08:15:480
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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