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2026-06-17 - 02:15

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 Wed Jun 17, 2026 00:43:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3098224636,0sleep30-21swapper/318:50:133
3098523930,0sleep10-21swapper/118:50:151
3109023423,0sleep00-21swapper/018:51:300
3085823425,0sleep20-21swapper/218:48:442
312449974,0cyclictest32257-21munin-run19:17:290
35160,0ktimersoftd/30-21swapper/321:24:093
339960,0migration/37963-21kthreadcore22:37:463
339960,0migration/35335-21sh21:16:393
339960,0migration/33164-21pmu-power21:52:463
339960,0migration/331269-21munin-node19:12:483
339960,0migration/320599-21munin-node19:32:413
339960,0migration/319568-21sh00:05:183
339960,0migration/313177-21sh22:22:223
339960,0migration/311301-21sh00:19:523
312479960,0cyclictest20578-21latency_hist23:47:272
312459960,0cyclictest0-21swapper/121:35:321
29725060,0irq/27-eth0-tx-19134-21munin-node19:07:500
29715060,0irq/26-eth0-rx-28788-21ssh23:12:033
29715060,0irq/26-eth0-rx-21413-21cpuspeed_turbos19:57:403
29715060,0irq/26-eth0-rx-11439-21ssh22:58:243
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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