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2026-08-30 - 03:59

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 Sun Aug 30, 2026 00:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
453545212453,66sleep30-21swapper/33
45364429580,9sleep20-21swapper/22
45363328657,12sleep10-21swapper/11
45354728156,7sleep00-21swapper/00
45381499241,19cyclictest819794-21chrt3
45381499241,18cyclictest565733-21taskset3
8117792227,3sleep00-21swapper/00
45381499221,9cyclictest751032-21chrt3
45381499221,17cyclictest0-21swapper/33
45381499212,15cyclictest0-21swapper/33
45381499211,16cyclictest66950irq/132-enp1s0-TxRx-33
45381499211,16cyclictest0-21swapper/33
8043192201,10sleep1803978-21sendmail-msp1
8023292200,1sleep20-21swapper/22
6681892201,4sleep0668919-21kthreadcore0
45381499206,10cyclictest0-21swapper/33
45381499201,3cyclictest0-21swapper/33
45381499201,16cyclictest0-21swapper/33
45381499201,15cyclictest0-21swapper/33
453814992011,3cyclictest0-21swapper/33
7931512191,4sleep0581763-21diskmemload0
6043822191,6sleep1581763-21diskmemload1
45381499199,7cyclictest891684-21turbostat3
453814991915,2cyclictest0-21swapper/33
453814991912,4cyclictest0-21swapper/33
45381499191,15cyclictest0-21swapper/33
45381499191,15cyclictest0-21swapper/33
45381499191,15cyclictest0-21swapper/33
45381499191,14cyclictest811573-21taskset3
45381499191,14cyclictest0-21swapper/33
45381499191,14cyclictest0-21swapper/33
45381499191,14cyclictest0-21swapper/33
45381499191,14cyclictest0-21swapper/33
45381499191,13cyclictest477053-21chrt3
8532122181,2sleep20-21swapper/22
8014252181,6sleep1581763-21diskmemload1
7749742181,5sleep1581763-21diskmemload1
7084882181,7sleep2581763-21diskmemload2
6741152181,2sleep10-21swapper/11
6657232181,1sleep20-21swapper/22
45381499181,14cyclictest0-21swapper/33
45381499181,14cyclictest0-21swapper/33
45381499181,14cyclictest0-21swapper/33
45381499181,14cyclictest0-21swapper/33
45381499181,14cyclictest0-21swapper/33
45381499181,14cyclictest0-21swapper/33
45381499181,14cyclictest0-21swapper/33
45381499181,14cyclictest0-21swapper/33
45381499181,14cyclictest0-21swapper/33
45381499181,14cyclictest0-21swapper/33
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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