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2025-07-12 - 11:26

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #9, slot #8

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: 50 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 rack9slot8s.osadl.org (updated Sat Jul 12, 2025 00:44:46)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
160849912252,0cyclictest81850irq/46-4a10000000:00:030
819501100,0irq/47-4a10000014471-21kworker/u2:419:04:520
16084999833,0cyclictest0-21swapper21:33:060
16084999232,0cyclictest0-21swapper21:55:020
81850820,0irq/46-4a10000015206-21runrttasks22:45:120
81850800,0irq/46-4a1000005436-21ssh23:33:350
81850780,0irq/46-4a10000031806-21kworker/u2:122:13:120
81850780,0irq/46-4a10000016390-21ssh21:39:200
81850780,0irq/46-4a10000013151-21ssh23:49:590
81850780,0irq/46-4a10000011419-21runrttasks22:37:150
81850770,0irq/46-4a10000014402-21ssh23:52:310
81850760,0irq/46-4a10000031603-21ssh23:20:120
81850760,0irq/46-4a10000025165-21ssh00:15:100
81850750,0irq/46-4a10000027011-21ssh23:10:340
81850740,0irq/46-4a10000032721-21ssh00:31:100
81850740,0irq/46-4a10000015201-21runrttasks21:29:210
81850730,0irq/46-4a10000019690-1kworker/u3:221:47:340
81850720,0irq/46-4a1000001613-21apt-config23:25:130
81850710,0irq/46-4a100000560-21kswapd020:10:190
81850710,0irq/46-4a1000003153-21kworker/u2:221:14:070
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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