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2025-05-05 - 00:20

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, slot #8

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 20 highest latencies:
System rack0slot8s.osadl.org (updated Sun May 04, 2025 12:44:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1721329382,9sleep00-21swapper/007:07:500
275991850,75ptp4l0-21swapper/107:06:041
94980760,71rtkit-daemon0-21swapper/407:06:076
1724426654,10sleep50-21swapper/507:08:197
1735326557,6sleep60-21swapper/607:09:568
1721126557,6sleep110-21swapper/1107:07:483
1719226351,10sleep70-21swapper/707:07:339
1708926351,10sleep100-21swapper/1007:06:002
57382590,2sleep011-21ksoftirqd/012:30:010
57382590,2sleep011-21ksoftirqd/012:30:010
36222590,0sleep60-21swapper/612:25:188
36222590,0sleep60-21swapper/612:25:188
322392590,0sleep40-21swapper/408:50:156
126362580,0sleep20-21swapper/207:40:314
319952550,0sleep80-21swapper/812:20:2010
319952550,0sleep80-21swapper/812:20:1910
1770799242,16cyclictest17774-21kworker/u24:007:15:005
17712992017,2cyclictest887-21turbostat10:59:596
275991190,0ptp4l0-21swapper/108:20:251
275991190,0ptp4l0-21swapper/107:20:161
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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