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2025-08-30 - 01:02

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #1, 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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  Intel
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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
Compare latency of primary with shadow system
Characteristics of the 20 highest latencies:
System rack1slot6s.osadl.org (updated Fri Aug 29, 2025 12:43:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2230991040,6rtkit-daemon0-21swapper/206:02:022
223099870,4rtkit-daemon2229-21rtkit-daemon06:21:542
30482760,4sleep334-21rcuc/307:51:583
205002740,6sleep220499-21sed07:21:502
205002740,6sleep220499-21sed07:21:502
130092730,4sleep013011-21head08:12:020
3940997019,32cyclictest22888-21crond10:51:203
3940996917,45cyclictest196411munin-node07:21:473
3940996917,45cyclictest196411munin-node07:21:473
223099690,9rtkit-daemon0-21swapper/309:09:470
3940996620,37cyclictest4529-21unixbench-2d09:01:573
394099657,50cyclictest0-21swapper/309:21:473
3940996524,34cyclictest7983-21tr09:11:383
3940996514,33cyclictest0-21swapper/308:41:563
223099640,5rtkit-daemon17001-21http_loadtime06:06:543
3940996311,32cyclictest0-21swapper/307:27:003
3940996216,39cyclictest19639-21munin-node10:41:503
3940996212,44cyclictest0-21swapper/309:08:043
3940996211,44cyclictest0-21swapper/309:01:253
3940996115,30cyclictest0-21swapper/308:41:263
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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