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2026-04-14 - 23:22

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 50 highest latencies:
System rack3slot3s.osadl.org (updated Tue Apr 14, 2026 12:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2660125212060,55sleep30-21swapper/33
266027228856,12sleep20-21swapper/22
266024728755,12sleep10-21swapper/11
266024128360,17sleep00-21swapper/00
29543992750,2sleep20-21swapper/22
2660530992421,1cyclictest0-21swapper/33
2660530992319,2cyclictest0-21swapper/33
2660530992313,6cyclictest3045739-21sleep3
266053099229,1cyclictest0-21swapper/33
266053099227,12cyclictest0-21swapper/33
2660530992219,1cyclictest0-21swapper/33
266053099218,10cyclictest0-21swapper/33
266053099211,6cyclictest2727139-21taskset3
2660530992112,6cyclictest66950irq/132-enp1s0-TxRx-33
266053099211,15cyclictest0-21swapper/33
266053099202,5cyclictest30628862chrt3
2660530992017,1cyclictest0-21swapper/33
2660530992016,2cyclictest0-21swapper/33
266053099201,3cyclictest0-21swapper/33
266053099201,16cyclictest0-21swapper/33
266053099201,14cyclictest0-21swapper/33
2660530992010,7cyclictest0-21swapper/33
266053099200,17cyclictest66950irq/132-enp1s0-TxRx-33
266053099191,5cyclictest2858004-21taskset3
266053099191,5cyclictest0-21swapper/33
266053099191,14cyclictest0-21swapper/33
266053099191,14cyclictest0-21swapper/33
266053099191,14cyclictest0-21swapper/33
266053099191,14cyclictest0-21swapper/33
266053099191,14cyclictest0-21swapper/33
266053099191,14cyclictest0-21swapper/33
266053099191,14cyclictest0-21swapper/33
31421702181,5sleep2431ktimers/22
29760942181,5sleep22976128-21ssh2
2660530991816,1cyclictest0-21swapper/33
2660530991816,1cyclictest0-21swapper/33
2660530991816,1cyclictest0-21swapper/33
2660530991814,2cyclictest0-21swapper/33
2660530991813,2cyclictest0-21swapper/33
2660530991812,3cyclictest2688973-21taskset3
2660530991812,3cyclictest0-21swapper/33
266053099181,14cyclictest0-21swapper/33
266053099181,14cyclictest0-21swapper/33
266053099181,14cyclictest0-21swapper/33
266053099181,14cyclictest0-21swapper/33
266053099181,14cyclictest0-21swapper/33
266053099181,14cyclictest0-21swapper/33
266053099181,14cyclictest0-21swapper/33
266053099181,13cyclictest0-21swapper/33
266053099180,15cyclictest0-21swapper/33
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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