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2026-04-09 - 03:09

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, 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 50 highest latencies:
System rackcslot8s.osadl.org (updated Thu Apr 09, 2026 00:46:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
111391610,5ptp4l0-21swapper/119:09:041
146862600,1sleep61068-21runrttasks00:35:166
111391600,6ptp4l0-21swapper/519:05:185
644025847,7sleep20-21swapper/219:09:442
219362570,0sleep40-21swapper/422:28:254
219362570,0sleep40-21swapper/422:28:254
172542550,0sleep00-21swapper/023:53:050
237122540,0sleep20-21swapper/223:15:182
635925342,6sleep70-21swapper/719:08:457
626525240,7sleep40-21swapper/419:07:304
627924937,7sleep00-21swapper/019:07:420
624424736,7sleep30-21swapper/319:07:213
609224636,6sleep60-21swapper/619:05:236
111391340,0ptp4l0-21swapper/421:05:144
111391320,0ptp4l0-21swapper/422:56:504
111391300,0ptp4l0-21swapper/523:48:065
111391300,0ptp4l0-21swapper/523:15:015
111391300,0ptp4l0-21swapper/021:34:030
111391290,1ptp4l26379-21strings00:05:171
111391290,0ptp4l0-21swapper/722:57:247
111391290,0ptp4l0-21swapper/423:38:514
111391290,0ptp4l0-21swapper/122:31:361
111391290,0ptp4l0-21swapper/023:30:220
111391280,2ptp4l0-21swapper/523:59:345
111391280,2ptp4l0-21swapper/000:34:590
111391280,1ptp4l3853-21sh22:02:240
111391280,0ptp4l0-21swapper/023:55:060
111391280,0ptp4l0-21swapper/023:07:340
111391280,0ptp4l0-21swapper/020:27:270
111391270,0ptp4l0-21swapper/423:08:264
111391270,0ptp4l0-21swapper/100:34:341
111391270,0ptp4l0-21swapper/023:12:120
111391270,0ptp4l0-21swapper/021:51:440
111391270,0ptp4l0-21swapper/021:29:560
111391260,4ptp4l0-21swapper/021:23:010
111391260,0ptp4l0-21swapper/522:56:225
111391260,0ptp4l0-21swapper/423:49:184
111391260,0ptp4l0-21swapper/422:38:504
111391260,0ptp4l0-21swapper/400:24:594
111391260,0ptp4l0-21swapper/122:45:171
111391260,0ptp4l0-21swapper/122:29:291
111391260,0ptp4l0-21swapper/122:29:291
111391260,0ptp4l0-21swapper/023:35:480
111391260,0ptp4l0-21swapper/020:55:190
111391260,0ptp4l0-21swapper/019:30:170
111391260,0ptp4l0-21swapper/000:38:540
111391250,1ptp4l3473-21memory20:10:157
111391250,1ptp4l32447-21latency_hist20:05:014
111391250,0ptp4l0-21swapper/723:21:397
111391250,0ptp4l0-21swapper/722:24:537
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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