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2026-03-17 - 05:11

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 Mar 17, 2026 00:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3858512212255,62sleep30-21swapper/33
385846527955,12sleep10-21swapper/11
385828427861,11sleep20-21swapper/22
385846427552,18sleep00-21swapper/00
41648862270,2sleep20-21swapper/22
41820372231,2sleep10-21swapper/11
405038522313,7sleep23989220-21diskmemload2
385876799228,10cyclictest4103361-21turbostat3
385876799221,17cyclictest102251-21chrt3
40396262211,8sleep13989220-21diskmemload1
385876799211,17cyclictest83518-21chrt3
385876799211,16cyclictest66950irq/132-enp1s0-TxRx-33
385876799211,16cyclictest4092960-21taskset3
385876799205,4cyclictest4006200-21taskset3
385876799205,4cyclictest4006200-21taskset3
3858767992016,2cyclictest0-21swapper/33
385876799201,16cyclictest0-21swapper/33
385876799201,15cyclictest66950irq/132-enp1s0-TxRx-33
385876799201,15cyclictest0-21swapper/33
385876799201,15cyclictest0-21swapper/33
385876799201,15cyclictest0-21swapper/33
385876799201,15cyclictest0-21swapper/33
40927942190,7sleep23989220-21diskmemload2
385876799191,15cyclictest0-21swapper/33
385876799191,14cyclictest0-21swapper/33
385876799191,14cyclictest0-21swapper/33
385876799191,14cyclictest0-21swapper/33
385876799191,14cyclictest0-21swapper/33
385876799191,14cyclictest0-21swapper/33
3858767991910,6cyclictest3881779-21taskset3
385876799181,14cyclictest0-21swapper/33
385876799181,14cyclictest0-21swapper/33
385876799181,14cyclictest0-21swapper/33
385876799181,14cyclictest0-21swapper/33
385876799181,14cyclictest0-21swapper/33
385876799181,14cyclictest0-21swapper/33
385876799181,14cyclictest0-21swapper/33
385876799181,14cyclictest0-21swapper/33
385876799181,14cyclictest0-21swapper/33
385876799181,14cyclictest0-21swapper/33
385876799181,14cyclictest0-21swapper/33
385876799181,14cyclictest0-21swapper/33
385876799181,14cyclictest0-21swapper/33
385876799181,14cyclictest0-21swapper/33
385876799181,13cyclictest4183161-21chrt3
385876799181,13cyclictest0-21swapper/33
385876799181,13cyclictest0-21swapper/33
385876799181,13cyclictest0-21swapper/33
385876799181,13cyclictest0-21swapper/33
385876799181,13cyclictest0-21swapper/33
385876799180,14cyclictest0-21swapper/33
1567332182,9sleep2156999-21df2
41532992171,2sleep20-21swapper/22
41258772171,3sleep20-21swapper/22
3858767991715,1cyclictest0-21swapper/33
385876799171,14cyclictest0-21swapper/33
385876799171,14cyclictest0-21swapper/33
3858767991711,3cyclictest0-21swapper/33
385876799171,13cyclictest0-21swapper/33
385876799171,13cyclictest0-21swapper/33
385876799171,12cyclictest0-21swapper/33
1454072171,5sleep13989220-21diskmemload1
1293702171,3sleep20-21swapper/22
1175872171,5sleep1117816-21users1
958462161,4sleep095929-21irqstats0
844692161,3sleep13989220-21diskmemload1
41540552160,2sleep14154070-21ssh1
41300852161,2sleep00-21swapper/00
385876799160,13cyclictest0-21swapper/33
385876799160,13cyclictest0-21swapper/33
385876799160,12cyclictest0-21swapper/33
41883402151,3sleep03989220-21diskmemload0
41272432151,3sleep03989220-21diskmemload0
412632151,2sleep00-21swapper/00
40407352151,2sleep00-21swapper/00
40042732151,2sleep20-21swapper/22
40042732151,2sleep20-21swapper/22
39403492151,9sleep23940566-21users2
385876799151,3cyclictest0-21swapper/33
3858767991512,2cyclictest0-21swapper/33
385876799151,12cyclictest0-21swapper/33
385876799151,11cyclictest39191172sleep33
3858767991510,2cyclictest0-21swapper/33
385876799150,13cyclictest0-21swapper/33
385876799150,13cyclictest0-21swapper/33
385876799150,12cyclictest0-21swapper/33
385876799150,12cyclictest0-21swapper/33
385876799150,12cyclictest0-21swapper/33
385876799150,12cyclictest0-21swapper/33
308452151,3sleep23989220-21diskmemload2
1212792151,9sleep2121329-21munin-run2
959302142,7sleep197191-21grep1
924832141,3sleep20-21swapper/22
855692141,4sleep085583-21ssh0
743732141,8sleep03989220-21diskmemload0
41831292142,6sleep24183153-21apt-get2
41204082141,2sleep10-21swapper/11
40137752141,9sleep24013786-21ssh2
40049022141,8sleep13989220-21diskmemload1
40049022141,8sleep13989220-21diskmemload1
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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