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2026-03-19 - 01:09

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 Wed Mar 18, 2026 12:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1191233212751,70sleep30-21swapper/33
119135428658,10sleep10-21swapper/11
119132128656,11sleep20-21swapper/22
119081928268,6sleep00-21swapper/00
14690772320,3sleep10-21swapper/11
15556892251,19sleep01321873-21diskmemload0
119163599221,7cyclictest1557761-21taskset3
119163599211,16cyclictest1426781-21taskset3
1191635992111,6cyclictest1339764-21turbostat3
13275112201,3sleep00-21swapper/00
1191635992017,1cyclictest0-21swapper/33
1191635992013,4cyclictest1664365-21taskset3
119163599201,17cyclictest0-21swapper/33
119163599201,16cyclictest0-21swapper/33
119163599201,15cyclictest66950irq/132-enp1s0-TxRx-33
119163599201,15cyclictest66950irq/132-enp1s0-TxRx-33
119163599201,15cyclictest1637719-21taskset3
119163599201,15cyclictest0-21swapper/33
1191635992010,6cyclictest16459562sleep33
119163599191,14cyclictest0-21swapper/33
119163599191,14cyclictest0-21swapper/33
119163599191,14cyclictest0-21swapper/33
119163599191,14cyclictest0-21swapper/33
119163599191,14cyclictest0-21swapper/33
119163599191,14cyclictest0-21swapper/33
1191635991910,6cyclictest66950irq/132-enp1s0-TxRx-33
119163599190,2cyclictest0-21swapper/33
119163599190,2cyclictest0-21swapper/33
119163599190,15cyclictest66950irq/132-enp1s0-TxRx-33
119163599190,15cyclictest0-21swapper/33
15484922181,3sleep21548507-21ssh2
13244482181,12sleep21326205-21tr2
119163599181,15cyclictest0-21swapper/33
119163599181,14cyclictest0-21swapper/33
119163599181,14cyclictest0-21swapper/33
119163599181,14cyclictest0-21swapper/33
119163599181,14cyclictest0-21swapper/33
119163599181,14cyclictest0-21swapper/33
119163599181,13cyclictest0-21swapper/33
119163599181,13cyclictest0-21swapper/33
119163599181,13cyclictest0-21swapper/33
119163599180,14cyclictest0-21swapper/33
119163599180,14cyclictest0-21swapper/33
16205402171,2sleep00-21swapper/00
14088392171,2sleep00-21swapper/00
13562402171,1sleep10-21swapper/11
13156432171,4sleep11315696-21ntp_states1
119163599178,6cyclictest1241475-21taskset3
1191635991715,1cyclictest0-21swapper/33
119163599171,4cyclictest0-21swapper/33
1191635991713,2cyclictest0-21swapper/33
1191635991712,3cyclictest0-21swapper/33
1191635991711,3cyclictest0-21swapper/33
119163599171,13cyclictest0-21swapper/33
119163599170,14cyclictest0-21swapper/33
119163599170,14cyclictest0-21swapper/33
119163599170,13cyclictest0-21swapper/33
16530382161,3sleep00-21swapper/00
16526652161,3sleep20-21swapper/22
15753362161,2sleep00-21swapper/00
15636162161,10sleep21563696-21memory2
15314802167,4sleep2431ktimers/22
15221162161,4sleep01321873-21diskmemload0
14513202161,4sleep11321873-21diskmemload1
14269672160,1sleep20-21swapper/22
13810702161,2sleep20-21swapper/22
119163599161,3cyclictest0-21swapper/33
1191635991613,1cyclictest0-21swapper/33
119163599161,12cyclictest0-21swapper/33
119163599160,14cyclictest0-21swapper/33
119163599160,13cyclictest0-21swapper/33
119163599160,13cyclictest0-21swapper/33
119163599160,12cyclictest0-21swapper/33
16459852151,3sleep11321873-21diskmemload1
16263612158,1sleep20-21swapper/22
16033102150,2sleep10-21swapper/11
15236152150,6sleep21523629-21ssh2
15120212151,3sleep20-21swapper/22
14755392151,9sleep11475616-21memory1
12569332151,3sleep21256984-21ntpq2
12569332151,3sleep21256984-21ntpq2
119163599159,4cyclictest1252596-21turbostat3
119163599157,4cyclictest12942412sleep33
1191635991512,2cyclictest0-21swapper/33
119163599150,12cyclictest0-21swapper/33
119163599150,12cyclictest0-21swapper/33
119163599150,12cyclictest0-21swapper/33
119163599150,12cyclictest0-21swapper/33
119163599150,12cyclictest0-21swapper/33
119163599150,12cyclictest0-21swapper/33
15127692141,9sleep11512780-21ssh1
14973002140,3sleep20-21swapper/22
14701062141,6sleep21470118-21rm2
14285922141,9sleep21430183-21cut2
13922262141,2sleep2171rcu_preempt2
13483182141,2sleep10-21swapper/11
119163599149,2cyclictest0-21swapper/33
119163599140,2cyclictest0-21swapper/33
119163599140,12cyclictest0-21swapper/33
119163599140,11cyclictest0-21swapper/33
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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