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2026-05-04 - 08:09

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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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.

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 May 04, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2948622590,3sleep029485-21sort23:30:170
516022570,2sleep05162-21timerandwakeup00:00:270
1241922500,3sleep012420-21sh22:25:000
777222100,2sleep07770-21processes22:05:250
2435621470,2sleep024358-21missed_timers23:10:180
366021370,3chrt3498-21/usr/sbin/munin21:50:180
143621190,4chrt1434-21processes19:35:250
652321110,4chrt6525-21mailstats22:00:250
355521020,3sleep03601-21wc19:45:010
2187321000,3sleep021731-21/usr/sbin/munin20:55:160
288872970,4sleep028961-21uptime19:15:280
35612910,5sleep03590-21/usr/sbin/munin23:55:200
78512900,2sleep07852-21awk20:00:240
2693927819,35sleep026962-21munin-run19:10:000
26991997444,18cyclictest15285-21seq20:30:090
26991996945,14cyclictest8726-21/usr/sbin/munin00:15:210
26991996941,16cyclictest19758-21users20:45:290
26991996932,12cyclictest31258-21ntp_states19:25:230
26991996841,18cyclictest12545-21/usr/sbin/munin22:25:290
26991996743,15cyclictest27052-21runrttasks23:20:220
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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