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2026-06-24 - 02:17

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 24, 2026 00:43:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2663525041,0sleep30-21swapper/318:47:003
3254923627,0sleep20-21swapper/218:47:512
3259423525,0sleep10-21swapper/118:48:221
3265322925,0sleep00-21swapper/018:49:010
4929966,0cyclictest25935-21diskmemload23:54:180
4929966,0cyclictest25935-21diskmemload21:43:360
4929960,0cyclictest0-21swapper/023:57:180
35160,0ktimersoftd/326844-1kworker/3:0H22:45:043
339960,0migration/38854-21sh21:18:463
339960,0migration/35185-21aten_r1power_fr20:12:003
339960,0migration/33491-21sh23:20:113
339960,0migration/328926-21sh21:36:353
339960,0migration/321164-21kthreadcore21:07:053
339960,0migration/319210-21munin-node20:22:023
339960,0migration/318534-21sh23:47:193
339960,0migration/310881-21sh23:23:013
29725060,0irq/27-eth0-tx-29416-21munin-node20:02:020
29715060,0irq/26-eth0-rx-26018-21open_files23:32:083
149960,0migration/026816-21fschecks_count21:32:010
149960,0migration/015400-21cpuspeed_turbos19:27:000
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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