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2026-07-11 - 10:25

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 Sat Jul 11, 2026 00:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2299451212676,46sleep30-21swapper/33
229951829260,12sleep10-21swapper/11
229952429163,10sleep20-21swapper/22
24797272720,2sleep30-21swapper/33
229953727252,14sleep00-21swapper/00
2299935992318,2cyclictest0-21swapper/33
229993599221,18cyclictest0-21swapper/33
229993599211,6cyclictest2422134-21taskset3
229993599211,16cyclictest2691224-21taskset3
24705152201,7sleep01-21systemd0
2299935992016,2cyclictest0-21swapper/33
229993599201,16cyclictest0-21swapper/33
229993599201,15cyclictest66950irq/132-enp1s0-TxRx-33
229993599201,15cyclictest23226542sleep33
229993599201,15cyclictest0-21swapper/33
229993599201,15cyclictest0-21swapper/33
229993599201,15cyclictest0-21swapper/33
229993599192,13cyclictest2772685-21turbostat3
229993599191,15cyclictest0-21swapper/33
229993599191,15cyclictest0-21swapper/33
229993599191,15cyclictest0-21swapper/33
229993599191,14cyclictest66950irq/132-enp1s0-TxRx-33
229993599191,14cyclictest0-21swapper/33
229993599191,14cyclictest0-21swapper/33
229993599191,14cyclictest0-21swapper/33
229993599191,14cyclictest0-21swapper/33
229993599191,14cyclictest0-21swapper/33
229993599191,14cyclictest0-21swapper/33
229993599191,13cyclictest0-21swapper/33
27640422180,6sleep134-21ksoftirqd/11
26170432181,5sleep22617261-21hddtemp_smartct2
26170432181,5sleep22617261-21hddtemp_smartct2
23971292181,3sleep00-21swapper/00
23289182186,8sleep22330395-21tr2
229993599182,11cyclictest2565201-21taskset3
229993599181,4cyclictest0-21swapper/33
229993599181,4cyclictest0-21swapper/33
229993599181,15cyclictest0-21swapper/33
229993599181,14cyclictest0-21swapper/33
229993599181,14cyclictest0-21swapper/33
229993599181,14cyclictest0-21swapper/33
229993599181,14cyclictest0-21swapper/33
229993599181,14cyclictest0-21swapper/33
229993599181,14cyclictest0-21swapper/33
229993599181,14cyclictest0-21swapper/33
229993599181,14cyclictest0-21swapper/33
229993599181,14cyclictest0-21swapper/33
229993599181,14cyclictest0-21swapper/33
229993599181,14cyclictest0-21swapper/33
229993599181,13cyclictest0-21swapper/33
229993599181,13cyclictest0-21swapper/33
229993599180,14cyclictest0-21swapper/33
27291502179,2sleep20-21swapper/22
27168962170,2sleep20-21swapper/22
26686782171,12sleep02669725-21grep0
26668312171,3sleep10-21swapper/11
25189752171,3sleep10-21swapper/11
24361152171,3sleep10-21swapper/11
24069882170,1sleep10-21swapper/11
229993599172,11cyclictest2498053-21taskset3
229993599172,10cyclictest2747340-21taskset3
229993599172,10cyclictest2365140-21taskset3
229993599171,4cyclictest0-21swapper/33
2299935991713,2cyclictest0-21swapper/33
2299935991712,4cyclictest0-21swapper/33
2299935991711,3cyclictest0-21swapper/33
2299935991711,3cyclictest0-21swapper/33
229993599171,13cyclictest0-21swapper/33
229993599171,13cyclictest0-21swapper/33
229993599171,13cyclictest0-21swapper/33
229993599171,13cyclictest0-21swapper/33
229993599171,13cyclictest0-21swapper/33
229993599171,12cyclictest0-21swapper/33
229993599170,14cyclictest0-21swapper/33
26926002161,4sleep12692611-21ssh1
26387062160,10sleep244-21ksoftirqd/22
25737122161,2sleep10-21swapper/11
25625142161,3sleep20-21swapper/22
25553842161,3sleep10-21swapper/11
27444642151,4sleep22427717-21diskmemload2
27220792151,3sleep02719283-40find0
27079662151,9sleep20-21swapper/22
26946742151,10sleep12696209-21cut1
25451642151,2sleep10-21swapper/11
25383312151,2sleep10-21swapper/11
25113042151,2sleep10-21swapper/11
24860692151,3sleep02486080-21ssh0
24676062151,3sleep12427717-21diskmemload1
23851492150,4sleep12380405-21kworker/u16:0-kvfree_rcu_reclaim1
229993599155,8cyclictest2299810-21turbostat3
229993599152,8cyclictest2333637-21taskset3
229993599151,12cyclictest0-21swapper/33
229993599150,3cyclictest0-21swapper/33
229993599150,13cyclictest0-21swapper/33
229993599150,13cyclictest0-21swapper/33
229993599150,13cyclictest0-21swapper/33
229993599150,12cyclictest0-21swapper/33
27882862141,2sleep20-21swapper/22
27456462141,8sleep02427717-21diskmemload0
27108822141,3sleep12710909-21apt-get1
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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