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2026-03-31 - 17:22

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 100 highest latencies:
System rack3slot3s.osadl.org (updated Tue Mar 31, 2026 12:43:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
306121021340,4sleep0221rcuc/00
297999921290,2sleep00-21swapper/00
2780812212664,58sleep30-21swapper/33
278075528656,12sleep10-21swapper/11
278068028252,7sleep00-21swapper/00
278077128062,12sleep20-21swapper/22
31822722380,6sleep10-21swapper/11
30473882380,2sleep20-21swapper/22
278111499248,13cyclictest0-21swapper/33
2781114992422,1cyclictest0-21swapper/33
278111499237,13cyclictest0-21swapper/33
2781114992320,1cyclictest0-21swapper/33
2781114992320,1cyclictest0-21swapper/33
278111499229,11cyclictest0-21swapper/33
2781114992220,1cyclictest0-21swapper/33
2781114992220,1cyclictest0-21swapper/33
2781114992219,1cyclictest0-21swapper/33
2781114992219,1cyclictest0-21swapper/33
2781114992218,2cyclictest0-21swapper/33
2781114992218,2cyclictest0-21swapper/33
278111499216,12cyclictest0-21swapper/33
2781114992119,1cyclictest0-21swapper/33
2781114992119,1cyclictest0-21swapper/33
2781114992117,2cyclictest0-21swapper/33
2781114992116,2cyclictest0-21swapper/33
278111499211,3cyclictest0-21swapper/33
278111499211,2cyclictest0-21swapper/33
278111499211,16cyclictest2943744-21taskset3
31576032201,6sleep23157799-21cstates2
29005122201,11sleep12900588-21timerandwakeup1
278111499205,12cyclictest0-21swapper/33
2781114992018,1cyclictest0-21swapper/33
2781114992018,1cyclictest0-21swapper/33
2781114992017,1cyclictest0-21swapper/33
2781114992017,1cyclictest0-21swapper/33
2781114992017,1cyclictest0-21swapper/33
2781114992017,1cyclictest0-21swapper/33
2781114992016,2cyclictest0-21swapper/33
2781114992015,2cyclictest0-21swapper/33
2781114992015,2cyclictest0-21swapper/33
278111499201,16cyclictest2895544-21taskset3
278111499201,16cyclictest0-21swapper/33
278111499201,15cyclictest2911571-21taskset3
278111499201,15cyclictest2799537-21taskset3
278111499201,15cyclictest0-21swapper/33
31916232191,9sleep23191634-21ssh2
29999232191,3sleep03000035-21ssh0
278111499194,12cyclictest0-21swapper/33
2781114991917,1cyclictest0-21swapper/33
2781114991917,1cyclictest0-21swapper/33
2781114991917,1cyclictest0-21swapper/33
2781114991916,1cyclictest0-21swapper/33
2781114991915,2cyclictest0-21swapper/33
278111499191,15cyclictest0-21swapper/33
278111499191,14cyclictest66950irq/132-enp1s0-TxRx-33
278111499190,12cyclictest0-21swapper/33
278111499181,5cyclictest0-21swapper/33
2781114991815,1cyclictest0-21swapper/33
2781114991814,2cyclictest0-21swapper/33
278111499181,14cyclictest0-21swapper/33
278111499181,14cyclictest0-21swapper/33
32602642178,2sleep2171rcu_preempt2
30423732172,8sleep244-21ksoftirqd/22
278111499172,13cyclictest0-21swapper/33
2781114991715,1cyclictest0-21swapper/33
2781114991715,1cyclictest0-21swapper/33
2781114991714,2cyclictest0-21swapper/33
2781114991713,2cyclictest0-21swapper/33
2781114991713,2cyclictest0-21swapper/33
278111499171,13cyclictest0-21swapper/33
278111499171,13cyclictest0-21swapper/33
278111499170,14cyclictest0-21swapper/33
32234352162,7sleep13223499-21ntpq1
30930102161,4sleep22911893-21diskmemload2
30513632161,10sleep12911893-21diskmemload1
30511062161,11sleep03051119-21rm0
28150472161,10sleep22815060-31mv2
2781114991614,1cyclictest0-21swapper/33
2781114991613,1cyclictest0-21swapper/33
2781114991612,2cyclictest0-21swapper/33
278111499161,12cyclictest0-21swapper/33
278111499160,14cyclictest0-21swapper/33
278111499160,14cyclictest0-21swapper/33
278111499160,13cyclictest0-21swapper/33
278111499160,13cyclictest0-21swapper/33
32521872151,9sleep22911893-21diskmemload2
32322532151,9sleep13232316-21ntp_states1
32187912152,3sleep10-21swapper/11
31670122151,10sleep03168509-21cut0
30759692150,1sleep10-21swapper/11
30692772151,3sleep20-21swapper/22
30162832151,3sleep02911893-21diskmemload0
30139172150,1sleep20-21swapper/22
29522352150,2sleep10-21swapper/11
2781114991513,1cyclictest0-21swapper/33
2781114991512,1cyclictest0-21swapper/33
32637472141,7sleep13263961-21diskstats1
31899262142,5sleep13189937-21pool-udisksd1
31118752141,6sleep00-21swapper/00
31067982141,3sleep23108510-21cut2
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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