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2026-07-08 - 03:02

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 Jul 08, 2026 00:43:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
552926160,0sleep20-21swapper/218:47:032
304450550,0irq/25-eth10-21swapper/318:47:343
554723522,0sleep00-21swapper/018:47:170
553822622,0sleep10-21swapper/118:47:101
58989965,0cyclictest0-21swapper/223:50:452
4160,0ktimersoftd/00-21swapper/022:03:380
4160,0ktimersoftd/00-21swapper/022:03:380
35160,0ktimersoftd/30-21swapper/321:05:293
339960,0migration/36604-21sh21:53:573
339960,0migration/36497-21sh21:33:083
339960,0migration/36249-21sh20:53:363
339960,0migration/35464-21sh23:12:353
339960,0migration/329226-21sh23:06:003
339960,0migration/316152-21kthreadcore23:20:433
339960,0migration/313939-21sh23:59:313
29715060,0irq/26-eth0-rx-6559-21runrttasks21:19:463
29715060,0irq/26-eth0-rx-14539-40yum-updatesd-he22:39:273
149960,0migration/06868-21sh22:15:060
149960,0migration/05745-21sh21:51:340
149960,0migration/030342-21sh23:49:530
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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