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2025-05-02 - 12:19

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 Fri May 02, 2025 00:46:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
114091790,2ptp4l0-21swapper/219:05:192
148382630,0sleep50-21swapper/521:25:005
248212620,0sleep50-21swapper/500:30:215
147012610,0sleep00-21swapper/022:05:570
147012610,0sleep00-21swapper/022:05:570
1206226151,6sleep30-21swapper/319:09:063
114091610,30ptp4l0-21swapper/019:05:470
2120915635,6phc2sys0-21swapper/619:09:086
114091560,5ptp4l0-21swapper/419:06:284
1193825443,7sleep70-21swapper/719:07:357
1186825240,7sleep10-21swapper/119:06:411
114091510,5ptp4l0-21swapper/519:09:165
114091380,0ptp4l0-21swapper/121:25:191
114091360,0ptp4l0-21swapper/522:55:205
114091310,0ptp4l0-21swapper/522:31:325
114091300,0ptp4l0-21swapper/523:43:235
114091300,0ptp4l0-21swapper/522:51:485
114091300,0ptp4l0-21swapper/422:07:054
114091300,0ptp4l0-21swapper/422:07:054
114091300,0ptp4l0-21swapper/419:55:164
114091300,0ptp4l0-21swapper/121:20:201
114091290,4ptp4l0-21swapper/123:28:141
114091290,0ptp4l0-21swapper/700:02:087
114091290,0ptp4l0-21swapper/523:51:195
114091290,0ptp4l0-21swapper/521:47:355
114091290,0ptp4l0-21swapper/400:26:234
114091290,0ptp4l0-21swapper/221:36:302
114091290,0ptp4l0-21swapper/200:13:202
114091290,0ptp4l0-21swapper/121:57:501
114091290,0ptp4l0-21swapper/121:50:391
114091290,0ptp4l0-21swapper/022:46:150
114091290,0ptp4l0-21swapper/021:27:400
114091280,8ptp4l29827-21ssh21:44:571
114091280,1ptp4l14687-21munin-node19:15:011
114091280,0ptp4l0-21swapper/522:17:445
114091280,0ptp4l0-21swapper/521:13:065
114091280,0ptp4l0-21swapper/500:23:195
114091280,0ptp4l0-21swapper/423:27:524
114091280,0ptp4l0-21swapper/400:17:144
114091280,0ptp4l0-21swapper/100:39:431
114091270,0ptp4l0-21swapper/721:39:347
114091270,0ptp4l0-21swapper/522:24:455
114091270,0ptp4l0-21swapper/422:20:494
114091270,0ptp4l0-21swapper/422:15:044
114091270,0ptp4l0-21swapper/419:10:154
114091270,0ptp4l0-21swapper/221:34:212
114091270,0ptp4l0-21swapper/221:15:492
114091270,0ptp4l0-21swapper/221:11:252
114091270,0ptp4l0-21swapper/123:51:351
114091270,0ptp4l0-21swapper/123:35:041
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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