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2025-12-25 - 10:08

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 Thu Dec 25, 2025 00:43:23)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
304450710,0irq/25-eth10-21swapper/319:05:293
247623829,0sleep20-21swapper/219:06:102
247923623,0sleep00-21swapper/019:06:120
251623424,0sleep10-21swapper/119:06:371
35160,0ktimersoftd/30-21swapper/321:24:403
339960,0migration/329783-21sh22:19:423
339960,0migration/327138-21sh23:18:503
339960,0migration/316462-21sh22:51:413
339960,0migration/315070-21kthreadcore21:14:113
339960,0migration/313596-21kthreadcore21:34:103
29715060,0irq/26-eth0-rx-6754-21ssh22:09:033
29715060,0irq/26-eth0-rx-526-21ssh23:00:563
29715060,0irq/26-eth0-rx-27781-21df23:19:043
29715060,0irq/26-eth0-rx-23085-21munin-node22:54:113
29715060,0irq/26-eth0-rx-13944-21ssh00:07:503
29715060,0irq/26-eth0-rx-10937-21processes21:49:133
27949960,0cyclictest0-21swapper/123:11:421
179960,0migration/13193-21munin-node23:04:081
149960,0migration/04885-21sh00:01:150
149960,0migration/03001-21sh23:23:240
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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