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2026-04-20 - 21:39

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, slot #3

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.
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 100 highest latencies:
System rack3slot3s.osadl.org (updated Mon Apr 20, 2026 12:43:50)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
243024212552,68sleep30-21swapper/33
24304828856,12sleep20-21swapper/22
24314928555,11sleep10-21swapper/11
24291228363,14sleep00-21swapper/00
2905012290,2sleep30-21swapper/33
24333599221,14cyclictest0-21swapper/33
24333599198,8cyclictest597206-21turbostat3
24333599191,14cyclictest435141-21taskset3
24333599191,14cyclictest0-21swapper/33
4464242182,5sleep2446443-21apt-get2
24333599181,5cyclictest597132-21taskset3
24333599181,14cyclictest282390-21chrt3
24333599181,14cyclictest0-21swapper/33
24333599181,14cyclictest0-21swapper/33
24333599181,13cyclictest0-21swapper/33
24333599181,13cyclictest0-21swapper/33
24333599181,13cyclictest0-21swapper/33
4843412171,12sleep0484359-21idleruntime-cro0
3991102171,12sleep0400843-21grep0
3959552171,3sleep20-21swapper/22
243335991713,3cyclictest0-21swapper/33
243335991712,4cyclictest0-21swapper/33
243335991712,3cyclictest0-21swapper/33
24333599171,14cyclictest0-21swapper/33
24333599171,13cyclictest0-21swapper/33
24333599171,13cyclictest0-21swapper/33
24333599171,12cyclictest0-21swapper/33
24333599171,11cyclictest0-21swapper/33
24333599170,14cyclictest0-21swapper/33
24333599170,14cyclictest0-21swapper/33
24333599170,13cyclictest0-21swapper/33
24333599170,13cyclictest0-21swapper/33
4300292161,12sleep1430040-21turbostat1
24333599165,8cyclictest440819-21turbostat3
24333599162,12cyclictest0-21swapper/33
243335991613,1cyclictest0-21swapper/33
24333599160,14cyclictest0-21swapper/33
24333599160,13cyclictest0-21swapper/33
24333599160,13cyclictest0-21swapper/33
24333599160,13cyclictest0-21swapper/33
24333599160,13cyclictest0-21swapper/33
24333599160,13cyclictest0-21swapper/33
24333599160,12cyclictest0-21swapper/33
24333599160,12cyclictest0-21swapper/33
5372922152,9sleep0537537-21/usr/sbin/munin0
3514592157,4sleep2351579-21grep2
24333599151,3cyclictest0-21swapper/33
24333599151,2cyclictest0-21swapper/33
243335991511,3cyclictest0-21swapper/33
243335991511,2cyclictest0-21swapper/33
24333599151,12cyclictest0-21swapper/33
24333599151,11cyclictest309350-21chrt3
243335991510,3cyclictest0-21swapper/33
24333599150,9cyclictest4571442sleep33
24333599150,3cyclictest0-21swapper/33
24333599150,13cyclictest0-21swapper/33
24333599150,13cyclictest0-21swapper/33
24333599150,13cyclictest0-21swapper/33
24333599150,12cyclictest0-21swapper/33
24333599150,12cyclictest0-21swapper/33
24333599150,12cyclictest0-21swapper/33
24333599150,12cyclictest0-21swapper/33
24333599150,12cyclictest0-21swapper/33
24333599150,12cyclictest0-21swapper/33
24333599150,12cyclictest0-21swapper/33
24333599150,12cyclictest0-21swapper/33
24333599150,12cyclictest0-21swapper/33
24333599150,11cyclictest0-21swapper/33
4290842141,8sleep0429141-21ntpq0
3816152141,8sleep1373610-21diskmemload1
2771732141,9sleep1277104-31find1
24333599142,8cyclictest515513-21taskset3
24333599141,2cyclictest0-21swapper/33
24333599140,12cyclictest0-21swapper/33
24333599140,12cyclictest0-21swapper/33
24333599140,12cyclictest0-21swapper/33
24333599140,12cyclictest0-21swapper/33
24333599140,12cyclictest0-21swapper/33
24333599140,11cyclictest0-21swapper/33
24333599140,11cyclictest0-21swapper/33
24333599140,11cyclictest0-21swapper/33
5226552131,8sleep0522744-21irqstats0
3102242131,2sleep20-21swapper/22
2771232131,8sleep0277128-21tracker-miner-f0
243335991311,1cyclictest0-21swapper/33
5421132121,7sleep0542226-21ntpq0
5218892121,5sleep1521960-21munin-run1
4289402121,5sleep2429028-21ntpq2
3898182121,7sleep00-21swapper/00
3707222121,3sleep1372403-21latency1
3573232120,1sleep00-21swapper/00
6002052111,5sleep1601360-21memory1
5909232111,5sleep1590976-21ntp_states1
5208702111,5sleep2520916-21ntpq2
5061872111,5sleep1506334-21diskstats1
4571672116,2sleep00-21swapper/00
4559042111,5sleep2455961-21ntpq2
4343782111,5sleep1434429-21ntpq1
3976572112,4sleep0368278-21kworker/0:0+events0
3956092111,5sleep1395669-21ntpq1
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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