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2026-06-10 - 02:22

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #4

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

Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: ondemand
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rack5slot4s.osadl.org (updated Wed Jun 10, 2026 00:44:17)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
320387122200,2sleep3451irq_work/319:40:023
335340521500,2sleep375-21kworker/3:1+events22:10:383
34521892570,4chrt0-21swapper/123:50:321
34288022530,5chrt13-21ksoftirqd/023:25:390
3172051995235,14cyclictest3297041-21ntpq21:10:441
3172051995141,7cyclictest3471541-21latency_hist00:10:001
3172051994840,6cyclictest3347084-21apt-get22:02:471
3172051994737,8cyclictest3366623-21ntpq22:20:421
3172056994636,7cyclictest1704890-21systemd-journal23:17:482
3172051994637,7cyclictest3182923-21ntpq19:15:411
3172051994637,7cyclictest3182923-21ntpq19:15:401
3172047994540,3cyclictest3139223-21kworker/u8:2+flush-8:019:20:340
317205699441,25cyclictest3398419-21/usr/sbin/munin22:55:362
3172051994323,17cyclictest1704890-21systemd-journal20:33:481
3172047994335,6cyclictest3347555-21/usr/sbin/munin22:05:450
3172051994232,7cyclictest3382362-21apt-get22:40:001
3172051994132,7cyclictest3417407-21/usr/sbin/munin23:15:401
3172051994131,8cyclictest3282162-21ntpq20:55:431
3172047994136,3cyclictest3183862-21kworker/u8:0+flush-8:019:40:490
3172047994135,4cyclictest3435960-21ntpq23:30:410
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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