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2026-05-03 - 13:00

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 Sun May 03, 2026 00:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2432055212153,64sleep30-21swapper/33
243688728973,10sleep20-21swapper/22
243547128852,10sleep10-21swapper/11
243208427752,14sleep00-21swapper/00
29135062241,11sleep02913727-21hddtemp_smartct0
2437164992421,1cyclictest0-21swapper/33
243716499241,16cyclictest2660514-21chrt3
2437164992321,1cyclictest0-21swapper/33
2437164992321,1cyclictest0-21swapper/33
2437164992319,2cyclictest0-21swapper/33
2437164992220,1cyclictest0-21swapper/33
2437164992220,1cyclictest0-21swapper/33
2437164992220,1cyclictest0-21swapper/33
2437164992218,2cyclictest0-21swapper/33
2437164992217,3cyclictest0-21swapper/33
243716499221,18cyclictest0-21swapper/33
243716499221,17cyclictest2818919-21taskset3
243716499221,14cyclictest0-21swapper/33
25924762211,2sleep00-21swapper/00
2437164992118,1cyclictest0-21swapper/33
2437164992118,1cyclictest0-21swapper/33
2437164992118,1cyclictest0-21swapper/33
2437164992118,1cyclictest0-21swapper/33
2437164992118,1cyclictest0-21swapper/33
2437164992117,2cyclictest0-21swapper/33
2437164992117,2cyclictest0-21swapper/33
2437164992117,1cyclictest0-21swapper/33
243716499211,16cyclictest0-21swapper/33
243716499210,17cyclictest0-21swapper/33
243716499205,12cyclictest0-21swapper/33
243716499205,12cyclictest0-21swapper/33
243716499202,15cyclictest0-21swapper/33
2437164992018,1cyclictest0-21swapper/33
2437164992018,1cyclictest0-21swapper/33
2437164992018,1cyclictest0-21swapper/33
2437164992017,1cyclictest0-21swapper/33
2437164992016,2cyclictest0-21swapper/33
243716499201,14cyclictest0-21swapper/33
27348202192,8sleep02567751-21diskmemload0
2437164991917,1cyclictest0-21swapper/33
2437164991917,1cyclictest0-21swapper/33
2437164991917,1cyclictest0-21swapper/33
2437164991917,1cyclictest0-21swapper/33
2437164991916,2cyclictest0-21swapper/33
2437164991916,1cyclictest0-21swapper/33
2437164991916,1cyclictest0-21swapper/33
2437164991915,2cyclictest0-21swapper/33
2437164991915,2cyclictest0-21swapper/33
2437164991914,2cyclictest0-21swapper/33
243716499191,15cyclictest2868888-21taskset3
28678592181,7sleep12567751-21diskmemload1
26682612180,2sleep20-21swapper/22
243716499186,1cyclictest0-21swapper/33
243716499185,1cyclictest0-21swapper/33
2437164991816,1cyclictest0-21swapper/33
2437164991815,1cyclictest0-21swapper/33
2437164991815,1cyclictest0-21swapper/33
2437164991815,1cyclictest0-21swapper/33
243716499181,14cyclictest0-21swapper/33
243716499180,16cyclictest0-21swapper/33
29172642171,10sleep12917353-21ntpq1
27590672171,2sleep10-21swapper/11
26990642171,12sleep22699108-21ssh2
26932592171,3sleep00-21swapper/00
2437164991715,1cyclictest0-21swapper/33
2437164991715,1cyclictest0-21swapper/33
2437164991714,1cyclictest0-21swapper/33
2437164991714,1cyclictest0-21swapper/33
2437164991713,2cyclictest0-21swapper/33
2437164991713,2cyclictest0-21swapper/33
27773682161,10sleep12567751-21diskmemload1
27428132161,2sleep20-21swapper/22
2437164991614,1cyclictest0-21swapper/33
2437164991614,1cyclictest0-21swapper/33
2437164991613,1cyclictest0-21swapper/33
2437164991613,1cyclictest0-21swapper/33
2437164991612,2cyclictest0-21swapper/33
243716499161,13cyclictest0-21swapper/33
243716499160,13cyclictest0-21swapper/33
243716499160,13cyclictest0-21swapper/33
28351182151,2sleep00-21swapper/00
28281202150,3sleep22567751-21diskmemload2
27109792151,6sleep22710989-21ssh2
25900082151,4sleep12567751-21diskmemload1
2437164991513,1cyclictest0-21swapper/33
2437164991511,2cyclictest0-21swapper/33
29180782141,7sleep20-21swapper/22
28446832144,2sleep2171rcu_preempt2
27621912141,7sleep02762270-21irqstats0
26579562141,4sleep02657970-21ssh0
26411552141,9sleep12641169-21ssh1
26322352141,4sleep12632245-21ssh1
25840682140,2sleep00-21swapper/00
25836292141,3sleep12567751-21diskmemload1
24612942141,9sleep22461389-21/usr/sbin/munin2
24373382142,7sleep12437357-21apt-get1
28759182131,7sleep02567751-21diskmemload0
27911832131,7sleep22791242-21ntpq2
27607822131,6sleep22567751-21diskmemload2
27334142131,2sleep10-21swapper/11
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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