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2026-05-02 - 17:43

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 02, 2026 12:43:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
351710,0ktimersoftd/315006-21perf06:56:373
2139323430,0sleep00-21swapper/006:54:430
2133623223,0sleep20-21swapper/206:54:012
2127023021,0sleep10-21swapper/106:53:161
339960,0migration/33242-21sh09:45:313
339960,0migration/326995-21sh09:38:493
339960,0migration/325826-21sh10:37:373
339960,0migration/324250-21munin-node07:47:013
339960,0migration/32071-21sh11:05:213
339960,0migration/319752-21sh09:36:033
339960,0migration/317997-21sh10:12:273
339960,0migration/312839-21kernelversion10:32:053
339960,0migration/312373-21munin-node09:12:003
339960,0migration/310834-21sh09:49:003
339960,0migration/310357-21latency_hist07:36:473
29725060,0irq/27-eth0-tx-11494-21munin-node08:02:030
216509966,0cyclictest19838-21diskmemload09:01:001
19160,0ktimersoftd/119838-21diskmemload10:49:181
149960,0migration/09557-21sh11:49:440
149960,0migration/03175-21sh10:06:090
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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