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2026-05-07 - 20:39

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 Thu May 07, 2026 12:43:53)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2544441212052,63sleep30-21swapper/33
254416128556,12sleep10-21swapper/11
254427628050,12sleep20-21swapper/22
254414728054,14sleep00-21swapper/00
2544575992522,1cyclictest0-21swapper/33
2544575992521,2cyclictest0-21swapper/33
2544575992320,2cyclictest0-21swapper/33
2544575992311,6cyclictest28765452sleep33
26993192221,16sleep22675585-21diskmemload2
26993192221,16sleep22675585-21diskmemload2
254457599227,13cyclictest0-21swapper/33
2544575992219,2cyclictest0-21swapper/33
254457599221,17cyclictest3006847-21taskset3
29053602210,12sleep02675585-21diskmemload0
2544575992119,1cyclictest0-21swapper/33
2544575992119,1cyclictest0-21swapper/33
2544575992118,1cyclictest0-21swapper/33
2544575992118,1cyclictest0-21swapper/33
2544575992118,1cyclictest0-21swapper/33
2544575992118,1cyclictest0-21swapper/33
2544575992117,2cyclictest0-21swapper/33
2544575992117,2cyclictest0-21swapper/33
254457599211,15cyclictest3020678-21taskset3
2544575992018,1cyclictest0-21swapper/33
2544575992018,1cyclictest0-21swapper/33
2544575992018,1cyclictest0-21swapper/33
2544575992017,2cyclictest0-21swapper/33
2544575992017,2cyclictest0-21swapper/33
2544575992016,2cyclictest0-21swapper/33
2544575992016,2cyclictest0-21swapper/33
2544575992016,2cyclictest0-21swapper/33
254457599201,16cyclictest0-21swapper/33
254457599201,14cyclictest2863894-21chrt3
254457599201,14cyclictest0-21swapper/33
254457599200,18cyclictest0-21swapper/33
254457599199,6cyclictest2803718-21turbostat3
254457599192,14cyclictest66950irq/132-enp1s0-TxRx-33
2544575991917,1cyclictest0-21swapper/33
2544575991917,1cyclictest0-21swapper/33
2544575991915,2cyclictest0-21swapper/33
2544575991915,2cyclictest0-21swapper/33
2544575991914,3cyclictest0-21swapper/33
2544575991913,4cyclictest0-21swapper/33
254457599190,3cyclictest0-21swapper/33
254457599190,16cyclictest0-21swapper/33
29722502181,3sleep20-21swapper/22
28273072180,4sleep02675585-21diskmemload0
27934262181,2sleep20-21swapper/22
2544575991816,1cyclictest0-21swapper/33
2544575991815,1cyclictest0-21swapper/33
2544575991814,2cyclictest0-21swapper/33
2544575991812,3cyclictest0-21swapper/33
254457599181,14cyclictest0-21swapper/33
254457599181,14cyclictest0-21swapper/33
254457599181,14cyclictest0-21swapper/33
254457599180,1cyclictest0-21swapper/33
28040652171,11sleep12804087-21find1
25955202171,4sleep02595067-21apt-get0
2544575991714,1cyclictest0-21swapper/33
2544575991713,2cyclictest0-21swapper/33
254457599171,13cyclictest0-21swapper/33
254457599171,13cyclictest0-21swapper/33
254457599171,13cyclictest0-21swapper/33
254457599171,11cyclictest2633227-21chrt3
254457599171,11cyclictest2633227-21chrt3
254457599170,14cyclictest0-21swapper/33
30124752161,9sleep272-21kcompactd02
29973182160,4sleep20-21swapper/22
29869352161,2sleep10-21swapper/11
29869352161,2sleep10-21swapper/11
29709162160,5sleep10-21swapper/11
28864782161,2sleep20-21swapper/22
27924942161,5sleep02792509-21ssh0
27787222160,3sleep10-21swapper/11
2544575991614,1cyclictest0-21swapper/33
2544575991614,1cyclictest0-21swapper/33
2544575991613,1cyclictest0-21swapper/33
2544575991613,1cyclictest0-21swapper/33
2544575991613,1cyclictest0-21swapper/33
254457599161,12cyclictest0-21swapper/33
254457599160,3cyclictest2589552-21taskset3
254457599160,13cyclictest0-21swapper/33
29875412151,3sleep02675585-21diskmemload0
29875412151,3sleep02675585-21diskmemload0
29049082150,1sleep20-21swapper/22
28438262150,3sleep00-21swapper/00
27757412151,3sleep22675585-21diskmemload2
27672402151,2sleep00-21swapper/00
27502612151,4sleep02675585-21diskmemload0
27086022152,3sleep02708611-21sh0
26811612151,9sleep02675585-21diskmemload0
2544575991513,1cyclictest0-21swapper/33
2544575991512,1cyclictest0-21swapper/33
2544575991512,1cyclictest0-21swapper/33
254457599150,3cyclictest0-21swapper/33
254457599150,13cyclictest0-21swapper/33
254457599150,13cyclictest0-21swapper/33
254457599150,12cyclictest0-21swapper/33
30318372140,2sleep20-21swapper/22
30073252141,9sleep13007496-21expr1
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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