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2025-12-10 - 01:57

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 20 highest latencies:
System rack8slot4s.osadl.org (updated Tue Dec 09, 2025 12:44:45)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
7076452241176,21sleep00-21swapper/007:09:360
7076682215178,24sleep50-21swapper/507:09:565
7073822213180,21sleep30-21swapper/307:05:523
7075472212175,24sleep20-21swapper/207:08:162
7073802210174,23sleep10-21swapper/107:05:501
7076402209175,22sleep40-21swapper/407:09:314
7074132207175,21sleep70-21swapper/707:06:217
7074972205172,21sleep60-21swapper/607:07:336
81852721130,1sleep6761rcuc/610:20:146
707909992822,5cyclictest0-21swapper/610:35:006
70788999260,25cyclictest852564-21latency_hist11:20:011
707909992522,3cyclictest0-21swapper/609:15:126
707909992522,2cyclictest760259-21perf08:39:596
707909992521,4cyclictest0-21swapper/611:35:116
70790999250,21cyclictest0-21swapper/609:55:126
70790999250,1cyclictest774973-21apt-get09:05:126
70790499250,24cyclictest2970800-21systemd-journal08:15:015
70790099250,2cyclictest801005-21apt-get09:50:124
70788699250,24cyclictest0-21swapper/007:20:120
707909992422,1cyclictest0-21swapper/611:30:006
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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