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2025-10-31 - 18:29

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #0, slot #6

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 here to display the system's profile data or here to proceed to next system.
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 rack0slot6s.osadl.org (updated Fri Oct 31, 2025 00:46:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
301433720770,74data-loop.00-21swapper/1519:05:477
301432520700,67data-loop.00-21swapper/919:05:4019
301432520690,66data-loop.00-21swapper/1119:06:193
301432520690,66data-loop.00-21swapper/1019:09:382
301432520670,64data-loop.00-21swapper/1819:05:3510
301432520660,64data-loop.00-21swapper/219:08:3712
301432520660,63data-loop.00-21swapper/1719:06:519
301432520640,61data-loop.00-21swapper/1919:05:4811
301432520640,61data-loop.00-21swapper/1619:08:248
24781232640,0sleep120-21swapper/1200:18:464
301432520630,61data-loop.00-21swapper/619:09:2516
301432520630,60data-loop.00-21swapper/119:06:211
301432520630,56data-loop.00-21swapper/1319:05:285
301432520620,60data-loop.00-21swapper/719:07:4517
301432520610,59data-loop.00-21swapper/1419:06:256
2203593996160,1cyclictest0-21swapper/1119:15:193
301433720600,57data-loop.00-21swapper/519:08:0215
301432520600,58data-loop.00-21swapper/819:07:0018
301432520590,56data-loop.00-21swapper/319:07:1813
301432520580,51data-loop.00-21swapper/019:09:480
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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