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2026-05-22 - 20:24

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 Fri May 22, 2026 12:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
323994212056,59sleep30-21swapper/33
32399728062,9sleep10-21swapper/11
32375728061,12sleep20-21swapper/22
32389927855,7sleep00-21swapper/00
32413999242,17cyclictest0-21swapper/33
324139992320,1cyclictest0-21swapper/33
324139992318,2cyclictest0-21swapper/33
324139992218,2cyclictest0-21swapper/33
324139992218,2cyclictest0-21swapper/33
32413999221,18cyclictest541ktimers/33
7006752212,8sleep0455679-21diskmemload0
32413999214,14cyclictest66950irq/132-enp1s0-TxRx-33
32413999212,15cyclictest66950irq/132-enp1s0-TxRx-33
324139992117,2cyclictest0-21swapper/33
32413999211,16cyclictest551538-21taskset3
324139992110,8cyclictest481371-21chrt3
324139992110,7cyclictest795158-21taskset3
324139992110,7cyclictest401804-21chrt3
6200522202,8sleep1455679-21diskmemload1
5688942201,3sleep00-21swapper/00
4797722201,3sleep10-21swapper/11
32413999206,10cyclictest0-21swapper/33
324139992018,1cyclictest0-21swapper/33
32413999201,15cyclictest66950irq/132-enp1s0-TxRx-33
32413999201,15cyclictest647637-21taskset3
32413999201,15cyclictest0-21swapper/33
324139992011,2cyclictest0-21swapper/33
32413999196,10cyclictest0-21swapper/33
32413999195,12cyclictest0-21swapper/33
32413999194,12cyclictest0-21swapper/33
32413999193,13cyclictest0-21swapper/33
324139991916,1cyclictest0-21swapper/33
324139991915,2cyclictest0-21swapper/33
324139991915,2cyclictest0-21swapper/33
324139991914,2cyclictest0-21swapper/33
324139991914,2cyclictest0-21swapper/33
32413999191,15cyclictest699042-21taskset3
32413999191,15cyclictest0-21swapper/33
32413999190,15cyclictest727846-21taskset3
5081712181,3sleep10-21swapper/11
4654282181,3sleep2466124-21kthreadcore2
32413999189,5cyclictest3772092sleep33
32413999182,13cyclictest541ktimers/33
32413999182,11cyclictest455707-21turbostat3
324139991816,1cyclictest0-21swapper/33
324139991815,1cyclictest0-21swapper/33
324139991814,2cyclictest0-21swapper/33
324139991814,2cyclictest0-21swapper/33
324139991814,2cyclictest0-21swapper/33
324139991814,2cyclictest0-21swapper/33
324139991814,2cyclictest0-21swapper/33
324139991812,4cyclictest0-21swapper/33
32413999181,14cyclictest0-21swapper/33
32413999181,14cyclictest0-21swapper/33
32413999181,14cyclictest0-21swapper/33
32413999181,14cyclictest0-21swapper/33
32413999181,13cyclictest5352062sleep33
32413999181,13cyclictest0-21swapper/33
32413999181,13cyclictest0-21swapper/33
32413999180,15cyclictest0-21swapper/33
6637972171,3sleep00-21swapper/00
5679622171,3sleep20-21swapper/22
32413999174,1cyclictest0-21swapper/33
32413999173,10cyclictest0-21swapper/33
324139991715,1cyclictest0-21swapper/33
324139991715,1cyclictest0-21swapper/33
324139991713,2cyclictest0-21swapper/33
32413999170,14cyclictest0-21swapper/33
32413999170,14cyclictest0-21swapper/33
8042912161,2sleep20-21swapper/22
7422612161,10sleep1455679-21diskmemload1
73438121610,3sleep1455679-21diskmemload1
7015052161,9sleep10-21swapper/11
6885762161,4sleep1455679-21diskmemload1
6833502161,3sleep10-21swapper/11
6388722160,12sleep20-21swapper/22
6126102161,2sleep00-21swapper/00
5219772160,8sleep1522022-21cat1
5139492160,2sleep00-21swapper/00
324139991614,1cyclictest0-21swapper/33
324139991614,1cyclictest0-21swapper/33
324139991614,1cyclictest0-21swapper/33
324139991614,1cyclictest0-21swapper/33
324139991612,2cyclictest0-21swapper/33
32413999161,12cyclictest0-21swapper/33
32413999160,13cyclictest0-21swapper/33
7613302151,10sleep0455679-21diskmemload0
7228682152,4sleep1723550-21cut1
5786882151,4sleep1455679-21diskmemload1
32413999150,13cyclictest0-21swapper/33
32413999150,13cyclictest0-21swapper/33
7347232141,8sleep0455679-21diskmemload0
7062752141,9sleep2706330-21ssh2
6732942141,3sleep1673305-21ssh1
6478182140,1sleep10-21swapper/11
6311072141,8sleep1455679-21diskmemload1
6154492140,3sleep00-21swapper/00
5953972141,4sleep1455679-21diskmemload1
5880152141,8sleep00-21swapper/00
5772122141,8sleep0455679-21diskmemload0
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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