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2026-08-13 - 06:27

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 Aug 13, 2026 00:46:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3038121010,2sleep52567299cyclictest00:32:085
111391600,5ptp4l0-21swapper/019:07:190
111391590,5ptp4l0-21swapper/519:05:125
111391590,28ptp4l0-21swapper/119:08:371
2516225837,7sleep20-21swapper/219:07:252
56082570,0sleep30-21swapper/321:39:593
111391570,6ptp4l0-21swapper/419:06:534
2516725343,6sleep70-21swapper/719:07:297
2438824735,7sleep30-21swapper/319:05:173
2345224736,6sleep60-21swapper/619:05:046
111391330,0ptp4l0-21swapper/520:45:165
111391320,0ptp4l0-21swapper/700:05:237
111391320,0ptp4l0-21swapper/421:45:364
111391310,0ptp4l0-21swapper/421:20:154
111391310,0ptp4l0-21swapper/121:31:501
111391300,0ptp4l0-21swapper/500:20:135
111391300,0ptp4l0-21swapper/422:26:584
111391300,0ptp4l0-21swapper/400:01:584
111391300,0ptp4l0-21swapper/123:04:121
111391300,0ptp4l0-21swapper/022:30:140
111391300,0ptp4l0-21swapper/022:10:100
111391290,0ptp4l0-21swapper/521:52:505
111391290,0ptp4l0-21swapper/521:36:025
111391290,0ptp4l0-21swapper/423:33:104
111391290,0ptp4l0-21swapper/421:35:234
111391290,0ptp4l0-21swapper/400:32:564
111391290,0ptp4l0-21swapper/122:49:091
111391290,0ptp4l0-21swapper/122:19:201
111391290,0ptp4l0-21swapper/121:16:041
111391290,0ptp4l0-21swapper/023:08:150
111391290,0ptp4l0-21swapper/022:27:370
111391280,0ptp4l0-21swapper/521:33:155
111391280,0ptp4l0-21swapper/423:13:014
111391280,0ptp4l0-21swapper/423:00:544
111391280,0ptp4l0-21swapper/422:32:364
111391280,0ptp4l0-21swapper/221:53:342
111391280,0ptp4l0-21swapper/100:14:061
111391280,0ptp4l0-21swapper/022:54:490
111391280,0ptp4l0-21swapper/000:15:200
111391270,4ptp4l7433-21latency_hist20:50:010
111391270,0ptp4l0-21swapper/700:03:307
111391270,0ptp4l0-21swapper/522:39:415
111391270,0ptp4l0-21swapper/522:39:415
111391270,0ptp4l0-21swapper/519:12:215
111391270,0ptp4l0-21swapper/421:34:544
111391270,0ptp4l0-21swapper/122:33:251
111391270,0ptp4l0-21swapper/121:57:181
111391260,0ptp4l0-21swapper/721:20:517
111391260,0ptp4l0-21swapper/523:48:445
111391260,0ptp4l0-21swapper/523:20:435
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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