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2026-01-01 - 17:53

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #8, slot #4

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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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

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 rack8slot4s.osadl.org (updated Thu Jan 01, 2026 12:44:43)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
8983372222162,19sleep70-21swapper/707:08:447
8981772218189,18sleep60-21swapper/607:06:256
8978802218167,15sleep40-21swapper/407:05:284
8982742215185,20sleep00-21swapper/007:07:490
8981312214160,18sleep50-21swapper/507:05:445
8981362210164,36sleep10-21swapper/107:05:491
8981912208175,21sleep20-21swapper/207:06:382
8981272208176,21sleep30-21swapper/307:05:433
89864099270,22cyclictest0-21swapper/009:20:000
89864099260,25cyclictest0-21swapper/007:35:130
89864099260,21cyclictest0-21swapper/011:15:110
898665992522,2cyclictest994923-21basename09:55:007
898665992521,2cyclictest948907-21sh08:35:017
89866599250,24cyclictest0-21swapper/709:40:127
898650992523,1cyclictest0-21swapper/307:50:023
898640992519,5cyclictest1078328-21sh12:20:000
898655992423,1cyclictest0-21swapper/410:00:144
898650992421,2cyclictest946066-21grep08:30:013
898646992423,1cyclictest940513-21apt-get08:20:112
89864699240,1cyclictest928385-21munin-run08:00:012
898640992423,1cyclictest0-21swapper/010:00:000
898640992422,2cyclictest0-21swapper/010:15:120
89864099240,23cyclictest1069771-21sh12:05:000
898665992321,1cyclictest0-21swapper/712:25:127
89866599230,22cyclictest980349-21turbostat09:30:007
898663992322,1cyclictest0-21swapper/612:10:146
89866399230,2cyclictest1014900-21apt-get10:30:006
89866399230,22cyclictest940078-21munin-run08:20:016
89866399230,22cyclictest1064473-21apt-get11:55:126
89866399230,22cyclictest0-21swapper/611:50:136
89866399230,22cyclictest0-21swapper/609:15:106
898658992321,1cyclictest994901-21munin-run09:55:005
898658992321,1cyclictest0-21swapper/509:05:115
898658992321,1cyclictest0-21swapper/508:35:145
89865899230,22cyclictest995318-21apt-get09:55:125
89865899230,22cyclictest980360-21awk09:30:005
89865899230,22cyclictest0-21swapper/509:40:125
89865899230,20cyclictest1067347-21apt-get12:00:125
898655992321,1cyclictest0-21swapper/410:25:004
89865599230,22cyclictest581rcuc/411:45:004
89865599230,22cyclictest0-21swapper/411:20:124
89865599230,1cyclictest940084-21run-parts08:20:014
89865099230,22cyclictest957911-21apt-get08:50:133
89865099230,22cyclictest1009186-21munin-run10:19:593
89865099230,22cyclictest0-21swapper/309:50:133
89865099230,22cyclictest0-21swapper/309:05:003
89865099230,22cyclictest0-21swapper/307:50:003
89864699230,23cyclictest363-21systemd-journal11:35:002
89864699230,22cyclictest0-21swapper/212:35:122
89864699230,22cyclictest0-21swapper/212:05:122
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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