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2025-10-24 - 02:19

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 Oct 24, 2025 00:43:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
221862780,4sleep222187-21cpuspeed_turbos17:24:362
4904996812,49cyclictest0-21swapper/219:19:472
489799682,58cyclictest41ktimersoftd/020:14:320
490499639,47cyclictest0-21swapper/217:04:432
4897996115,22cyclictest0-21swapper/017:39:360
44512613,49sleep10-21swapper/117:54:391
223099610,4rtkit-daemon2229-21rtkit-daemon20:43:482
223099610,4rtkit-daemon2229-21rtkit-daemon20:00:282
223099610,4rtkit-daemon2229-21rtkit-daemon18:47:162
490499584,11cyclictest15592-21munin-run18:19:192
490499584,11cyclictest15592-21munin-run18:19:192
489799580,10cyclictest22756-21kworker/3:118:34:190
263502583,8sleep326428-21cut17:34:213
223099580,4rtkit-daemon2229-21rtkit-daemon19:43:362
223099570,4rtkit-daemon2229-21rtkit-daemon17:50:252
490199564,30cyclictest0-21swapper/117:49:421
4897995619,31cyclictest0-21swapper/021:04:220
47842564,6sleep00-21swapper/016:48:190
298362564,12sleep00-21swapper/018:48:230
223099560,5rtkit-daemon2229-21rtkit-daemon20:48:262
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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