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2025-11-23 - 03:27

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #1, slot #2

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 here to display the system's profile data or here to proceed to next system.
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.
Unexpectedly long latencies may be caused by SMIs
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 rack1slot2s.osadl.org (updated Sun Nov 23, 2025 00:43:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2455927473,0sleep00-21swapper/018:36:310
2447423928,0sleep10-21swapper/118:35:321
2447123828,0sleep30-21swapper/318:35:303
2465423526,0sleep20-21swapper/218:37:372
248939988,0cyclictest6445-21snmpd23:24:120
4160,0ktimersoftd/00-21swapper/023:34:400
339960,0migration/36377-21sh21:27:093
339960,0migration/36101-21latency_hist23:09:353
339960,0migration/321895-21sh20:55:333
339960,0migration/320690-21sh23:37:193
339960,0migration/320669-21sh23:15:543
28415060,0irq/27-eth0-tx-20136-21ssh23:35:312
28415060,0irq/27-eth0-tx-0-21swapper/223:49:192
28415060,0irq/27-eth0-tx-0-21swapper/223:31:232
28415060,0irq/27-eth0-tx-0-21swapper/223:14:592
28415060,0irq/27-eth0-tx-0-21swapper/223:12:562
28415060,0irq/27-eth0-tx-0-21swapper/222:57:182
28415060,0irq/27-eth0-tx-0-21swapper/222:45:062
28415060,0irq/27-eth0-tx-0-21swapper/222:41:572
28415060,0irq/27-eth0-tx-0-21swapper/222:35:252
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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