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2025-07-01 - 08:19

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 Tue Jul 01, 2025 00:44:40)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
819501740,0irq/47-4a10000020658-21seq19:09:050
81950850,0irq/47-4a10000020295-21ssh21:41:530
81950850,0irq/47-4a10000019431-21ssh21:39:560
81950840,0irq/47-4a1000008911-21apt21:14:530
81950840,0irq/47-4a1000004661-21kworker/u2:222:23:360
81950840,0irq/47-4a10000030179-21ssh23:22:350
81950840,0irq/47-4a1000002648-21kworker/u2:021:30:420
81950840,0irq/47-4a1000001712-21snmpd00:10:270
81950840,0irq/47-4a10000016263-21kworker/u2:000:07:590
81850840,0irq/46-4a1000003764-21idleruntime-cro22:19:570
81950820,0irq/47-4a10000029120-21ssh22:03:070
81950820,0irq/47-4a10000027851-21ssh00:34:020
81950820,0irq/47-4a1000002457-21kworker/u2:022:52:100
81950820,0irq/47-4a10000013841-21rm22:43:570
81850820,0irq/46-4a10000029706-21seq20:05:030
81950810,0irq/47-4a1000008252-21ssh22:30:290
81950810,0irq/47-4a10000032337-21ssh22:10:370
81950810,0irq/47-4a10000031914-21ssh22:09:490
81950810,0irq/47-4a10000027470-21ssh21:59:200
81950810,0irq/47-4a1000002457-21kworker/u2:023:39:470
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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