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2026-07-17 - 11:51

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 Fri Jul 17, 2026 00:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
44841321360,2sleep2448297-21ssh2
22802212552,67sleep30-21swapper/33
2287628353,11sleep20-21swapper/22
2257928163,12sleep10-21swapper/11
2245127662,7sleep00-21swapper/00
4795082340,3sleep0150759-21diskmemload0
2171512330,3sleep00-21swapper/00
23085993014,5cyclictest0-21swapper/33
23085992713,5cyclictest0-21swapper/33
23085992623,1cyclictest0-21swapper/33
23085992521,2cyclictest0-21swapper/33
2308599232,17cyclictest0-21swapper/33
2308599232,17cyclictest0-21swapper/33
5016782222,6sleep1501772-21ssh1
2308599221,7cyclictest168435-21taskset3
2308599221,17cyclictest0-21swapper/33
23085992111,6cyclictest0-21swapper/33
2308599211,16cyclictest0-21swapper/33
23085992110,2cyclictest237807-21turbostat3
2308599210,13cyclictest0-21swapper/33
2308599202,15cyclictest66950irq/132-enp1s0-TxRx-33
2308599202,13cyclictest316431-21taskset3
23085992013,4cyclictest0-21swapper/33
2308599201,1cyclictest0-21swapper/33
2308599201,17cyclictest0-21swapper/33
2308599201,16cyclictest0-21swapper/33
2308599201,14cyclictest0-21swapper/33
2308599200,3cyclictest774362sleep33
2769442191,7sleep2277089-21/usr/sbin/munin2
2308599198,8cyclictest510124-21chrt3
2308599194,2cyclictest0-21swapper/33
2308599191,15cyclictest0-21swapper/33
2308599191,15cyclictest0-21swapper/33
2308599191,14cyclictest0-21swapper/33
2308599191,14cyclictest0-21swapper/33
2308599191,14cyclictest0-21swapper/33
2308599191,14cyclictest0-21swapper/33
2308599191,14cyclictest0-21swapper/33
2308599191,14cyclictest0-21swapper/33
2308599191,14cyclictest0-21swapper/33
2308599191,14cyclictest0-21swapper/33
2308599190,17cyclictest0-21swapper/33
4998442181,2sleep00-21swapper/00
4098532181,3sleep00-21swapper/00
3729172189,1sleep1171rcu_preempt1
2308599181,5cyclictest0-21swapper/33
2308599181,5cyclictest0-21swapper/33
2308599181,4cyclictest0-21swapper/33
23085991814,2cyclictest0-21swapper/33
23085991812,3cyclictest0-21swapper/33
2308599181,14cyclictest0-21swapper/33
2308599181,14cyclictest0-21swapper/33
2308599181,14cyclictest0-21swapper/33
2308599181,14cyclictest0-21swapper/33
2308599181,13cyclictest0-21swapper/33
2308599181,13cyclictest0-21swapper/33
2308599181,13cyclictest0-21swapper/33
2308599181,13cyclictest0-21swapper/33
2308599181,13cyclictest0-21swapper/33
4590592171,11sleep2460613-21ssh2
4557822171,2sleep00-21swapper/00
2308599172,9cyclictest98682-21taskset3
2308599171,4cyclictest0-21swapper/33
2308599171,3cyclictest0-21swapper/33
23085991712,3cyclictest0-21swapper/33
23085991712,2cyclictest0-21swapper/33
23085991711,4cyclictest0-21swapper/33
2308599171,13cyclictest0-21swapper/33
23085991710,4cyclictest0-21swapper/33
2308599170,14cyclictest0-21swapper/33
2308599170,14cyclictest0-21swapper/33
2308599170,14cyclictest0-21swapper/33
2308599170,13cyclictest0-21swapper/33
2262462171,4sleep0150759-21diskmemload0
2092772170,3sleep20-21swapper/22
1847842170,2sleep00-21swapper/00
1143592172,4sleep2114378-21apt-get2
992082161,11sleep299631-21cut2
4497292161,11sleep1450600-21cut1
4082242161,2sleep10-21swapper/11
3318792161,3sleep20-21swapper/22
2708592161,2sleep10-21swapper/11
2532442161,4sleep0150759-21diskmemload0
23085991610,3cyclictest0-21swapper/33
2308599160,14cyclictest0-21swapper/33
1998192160,10sleep20-21swapper/22
983662154,7sleep298432-21sendmail-msp2
5160342150,2sleep0221rcuc/00
4740632151,2sleep00-21swapper/00
4457032150,2sleep10-21swapper/11
4363472150,2sleep10-21swapper/11
4178722150,1sleep10-21swapper/11
4113442150,2sleep20-21swapper/22
2308599150,13cyclictest0-21swapper/33
2308599150,12cyclictest0-21swapper/33
2308599150,12cyclictest0-21swapper/33
2308599150,12cyclictest0-21swapper/33
1748202151,3sleep0150759-21diskmemload0
571102141,4sleep057212-21perl0
5167682141,8sleep1150759-21diskmemload1
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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