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2026-05-09 - 17:54

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 Sat May 09, 2026 12:43:23)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
799523626,0sleep20-21swapper/206:53:552
803423531,0sleep00-21swapper/006:54:210
304450350,0irq/25-eth10-21swapper/306:53:313
780022622,0sleep10-21swapper/106:51:381
82629965,0cyclictest17474-21ps10:41:242
82629960,0cyclictest0-21swapper/212:19:062
339960,0migration/330007-21sh10:09:163
339960,0migration/322456-21sh09:45:053
339960,0migration/320600-21sh11:02:263
339960,0migration/312810-21sh10:16:473
339960,0migration/312343-21munin-node08:11:253
259960,0migration/21039-21kthreadcore10:11:262
82629955,0cyclictest0-21swapper/211:10:212
82629955,0cyclictest0-21swapper/210:56:102
82629950,0cyclictest0-21swapper/211:37:282
82629950,0cyclictest0-21swapper/211:30:232
82609955,0cyclictest0-21swapper/110:07:321
8215050,0irq/24-0000:00:12361-21python10:16:292
339950,0migration/39952-21taskset07:43:533
339950,0migration/35055-21taskset11:55:543
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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