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2026-04-28 - 22:37

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 Tue Apr 28, 2026 12:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2404959211861,53sleep30-21swapper/33
240573221100,2sleep20-21swapper/22
240513627951,10sleep10-21swapper/11
240520227857,6sleep00-21swapper/00
240026227858,12sleep20-21swapper/22
240540599220,18cyclictest2646396-21taskset3
27203292211,2sleep00-21swapper/00
25681252212,12sleep2802-21snmpd2
240540599211,17cyclictest2739260-21taskset3
240540599211,16cyclictest2857824-21taskset3
243192022011,5sleep12428896-21/usr/sbin/munin1
240540599204,13cyclictest0-21swapper/33
240540599201,16cyclictest0-21swapper/33
240540599201,16cyclictest0-21swapper/33
240540599201,15cyclictest66950irq/132-enp1s0-TxRx-33
240540599200,17cyclictest66950irq/132-enp1s0-TxRx-33
26390012191,13sleep02639138-21tr0
240540599192,14cyclictest66950irq/132-enp1s0-TxRx-33
2405405991914,3cyclictest0-21swapper/33
240540599191,15cyclictest66950irq/132-enp1s0-TxRx-33
240540599191,15cyclictest0-21swapper/33
240540599191,15cyclictest0-21swapper/33
240540599191,14cyclictest0-21swapper/33
240540599191,14cyclictest0-21swapper/33
240540599191,14cyclictest0-21swapper/33
240540599191,14cyclictest0-21swapper/33
240540599191,14cyclictest0-21swapper/33
240540599191,14cyclictest0-21swapper/33
240540599191,14cyclictest0-21swapper/33
240540599191,14cyclictest0-21swapper/33
240540599191,14cyclictest0-21swapper/33
240540599190,16cyclictest66950irq/132-enp1s0-TxRx-33
240540599190,16cyclictest66950irq/132-enp1s0-TxRx-33
275453421811,2sleep10-21swapper/11
26317702181,7sleep12633432-21tr1
2405405991813,2cyclictest0-21swapper/33
240540599181,14cyclictest0-21swapper/33
240540599181,14cyclictest0-21swapper/33
240540599181,14cyclictest0-21swapper/33
240540599181,14cyclictest0-21swapper/33
240540599181,14cyclictest0-21swapper/33
240540599181,14cyclictest0-21swapper/33
240540599181,14cyclictest0-21swapper/33
240540599181,14cyclictest0-21swapper/33
240540599181,13cyclictest0-21swapper/33
240540599181,13cyclictest0-21swapper/33
2405405991810,5cyclictest2541918-21chrt3
240540599180,14cyclictest0-21swapper/33
240540599180,14cyclictest0-21swapper/33
240540599180,14cyclictest0-21swapper/33
26885222170,2sleep20-21swapper/22
240540599171,14cyclictest0-21swapper/33
240540599171,14cyclictest0-21swapper/33
240540599171,13cyclictest0-21swapper/33
240540599170,14cyclictest0-21swapper/33
240540599170,14cyclictest0-21swapper/33
240540599170,14cyclictest0-21swapper/33
27720702161,2sleep20-21swapper/22
27118672160,1sleep10-21swapper/11
26387182161,4sleep22638757-21grep2
25774272161,7sleep02577438-21ssh0
25686222160,1sleep00-21swapper/00
240540599161,13cyclictest0-21swapper/33
240540599161,13cyclictest0-21swapper/33
240540599161,12cyclictest0-21swapper/33
240540599161,12cyclictest0-21swapper/33
240540599160,13cyclictest0-21swapper/33
240540599160,13cyclictest0-21swapper/33
28831752150,3sleep12536312-21diskmemload1
28651712151,9sleep20-21swapper/22
28325712151,2sleep00-21swapper/00
28149212151,2sleep20-21swapper/22
27211152151,3sleep20-21swapper/22
27127542150,2sleep02536312-21diskmemload0
26977382151,2sleep00-21swapper/00
240540599151,2cyclictest0-21swapper/33
240540599151,2cyclictest0-21swapper/33
2405405991512,2cyclictest0-21swapper/33
2405405991512,2cyclictest0-21swapper/33
2405405991512,1cyclictest0-21swapper/33
2405405991511,3cyclictest0-21swapper/33
2405405991511,2cyclictest2489129-21taskset3
2405405991510,3cyclictest0-21swapper/33
240540599150,13cyclictest0-21swapper/33
240540599150,13cyclictest0-21swapper/33
240540599150,12cyclictest0-21swapper/33
240540599150,12cyclictest0-21swapper/33
240540599150,12cyclictest0-21swapper/33
28733412141,9sleep02536312-21diskmemload0
28512412141,5sleep02852873-21kthreadcore0
28068982141,7sleep22536312-21diskmemload2
27657372141,2sleep00-21swapper/00
27453922141,4sleep12745402-21ssh1
26236792141,2sleep10-21swapper/11
26034442141,2sleep10-21swapper/11
25946092140,2sleep00-21swapper/00
25837952141,7sleep12583838-21ntpq1
25439302141,2sleep00-21swapper/00
240540599145,6cyclictest2445122-21turbostat3
240540599142,8cyclictest0-21swapper/33
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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