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2026-04-13 - 06:54

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #6

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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Data to construct the above plot have been generated using the RT test utility cyclictest.

Total number of samples: 50 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rack4slot6s.osadl.org (updated Mon Apr 13, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2500722600,3sleep025009-21cut20:45:270
1840622550,3sleep018407-21ntp_kernel_pll_20:20:210
1542622490,2sleep015422-21cat00:20:210
2969221560,3sleep029691-21wc21:05:010
413621430,3sleep04137-21ntpq19:25:190
32354991258,14cyclictest16819-21irqstats22:20:170
323549912110,17cyclictest9522-21runrttasks21:50:340
323549911926,15cyclictest3699-21/usr/sbin/munin23:35:160
323549911833,76cyclictest7503-21munin-plugin-st21:45:000
323549911728,15cyclictest15857-21/usr/sbin/munin20:10:250
323549911711,15cyclictest30684-21sshd21:08:180
32354991168,14cyclictest14870-21chrt20:05:370
323549911626,14cyclictest18430-21runrttasks00:30:560
323549911626,13cyclictest7217-21runrttasks23:49:180
323549911611,15cyclictest31046-21memory23:15:210
323549911610,16cyclictest19701-21ntp_states20:25:220
323549911528,14cyclictest7334-21runrttasks19:37:520
323549911527,16cyclictest8866-21/usr/sbin/munin23:55:170
32354991149,30cyclictest31222-21memory21:10:180
32354991149,14cyclictest6089-21latency_hist23:45:020
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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