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2025-04-22 - 18:43

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 Apr 22, 2025 12:44:47)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
819501690,0irq/47-4a1000002279-21lldpd07:06:090
81950800,0irq/47-4a10000012870-21apt12:40:010
81850800,0irq/46-4a1000005611-21seq11:05:080
81850800,0irq/46-4a1000004446-21ssh11:01:530
81950790,0irq/47-4a10000028127-21ssh10:39:210
81950790,0irq/47-4a10000023585-21ssh10:27:150
81950790,0irq/47-4a10000012963-21ssh09:59:250
81850790,0irq/46-4a10000027471-21kworker/u2:509:20:330
81850790,0irq/46-4a1000002464-21rm09:30:550
81950780,0irq/47-4a10000020181-21ssh11:40:480
81850780,0irq/46-4a1000002284-21lldpd10:40:160
81850780,0irq/46-4a10000019740-21latency_hist08:20:010
81850780,0irq/46-4a10000017947-21runrttasks11:35:500
81950770,0irq/47-4a1000009779-21ssh11:15:390
81950770,0irq/47-4a1000008125-21ssh11:11:370
81850770,0irq/46-4a1000008217-21rm12:29:030
81850770,0irq/46-4a1000004020-21sh12:19:130
81850770,0irq/46-4a10000028466-21rm09:13:040
81850770,0irq/46-4a10000016984-21sshd11:33:320
274332770,0chrt27047-21kworker/u2:209:09:460
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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