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2026-04-13 - 17:14

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 100 highest latencies:
System rackcslot8s.osadl.org (updated Mon Apr 13, 2026 12:46:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
111391660,35ptp4l0-21swapper/107:05:341
951226232,16sleep70-21swapper/707:06:537
111391610,6ptp4l0-21swapper/007:06:060
111391610,5ptp4l0-21swapper/407:07:254
971225736,6sleep20-21swapper/207:09:272
965425735,7sleep30-21swapper/307:08:403
160552550,0sleep60-21swapper/611:00:156
969425039,6sleep50-21swapper/507:09:155
960424737,6sleep60-21swapper/607:08:036
111391330,0ptp4l0-21swapper/010:40:210
111391320,0ptp4l0-21swapper/510:25:165
111391320,0ptp4l0-21swapper/410:00:134
111391320,0ptp4l0-21swapper/410:00:124
111391320,0ptp4l0-21swapper/011:57:370
111391310,0ptp4l2276-21strings08:00:164
111391310,0ptp4l0-21swapper/010:36:230
111391310,0ptp4l0-21swapper/010:34:200
111391300,0ptp4l0-21swapper/512:10:185
111391300,0ptp4l0-21swapper/410:27:304
111391300,0ptp4l0-21swapper/012:00:010
111391300,0ptp4l0-21swapper/011:43:400
111391300,0ptp4l0-21swapper/007:20:200
111391300,0ptp4l0-21swapper/007:20:200
111391290,0ptp4l0-21swapper/507:15:125
111391290,0ptp4l0-21swapper/412:30:194
111391290,0ptp4l0-21swapper/411:46:104
111391290,0ptp4l0-21swapper/411:10:144
111391290,0ptp4l0-21swapper/409:55:204
111391290,0ptp4l0-21swapper/110:26:421
111391290,0ptp4l0-21swapper/109:24:151
111391290,0ptp4l0-21swapper/107:25:171
111391290,0ptp4l0-21swapper/010:18:000
111391290,0ptp4l0-21swapper/008:55:150
111391280,0ptp4l0-21swapper/409:52:304
111391280,0ptp4l0-21swapper/012:15:130
111391280,0ptp4l0-21swapper/011:29:480
111391280,0ptp4l0-21swapper/010:01:310
111391280,0ptp4l0-21swapper/010:01:300
111391280,0ptp4l0-21swapper/007:40:180
111391270,6ptp4l0-21swapper/309:26:273
111391270,2ptp4l0-21swapper/410:56:304
111391270,1ptp4l0-21swapper/410:52:014
111391270,0ptp4l0-21swapper/509:24:585
111391270,0ptp4l0-21swapper/411:32:004
111391270,0ptp4l0-21swapper/410:30:454
111391270,0ptp4l0-21swapper/409:22:104
111391270,0ptp4l0-21swapper/409:10:484
111391270,0ptp4l0-21swapper/109:29:441
111391270,0ptp4l0-21swapper/109:16:331
111391270,0ptp4l0-21swapper/012:35:130
111391270,0ptp4l0-21swapper/012:35:130
111391270,0ptp4l0-21swapper/011:49:520
111391270,0ptp4l0-21swapper/011:06:160
111391270,0ptp4l0-21swapper/010:28:080
111391270,0ptp4l0-21swapper/010:12:100
111391260,0ptp4l0-21swapper/509:30:055
111391260,0ptp4l0-21swapper/412:22:564
111391260,0ptp4l0-21swapper/411:28:054
111391260,0ptp4l0-21swapper/410:37:094
111391260,0ptp4l0-21swapper/410:23:254
111391260,0ptp4l0-21swapper/410:16:584
111391260,0ptp4l0-21swapper/111:39:291
111391260,0ptp4l0-21swapper/110:04:171
111391260,0ptp4l0-21swapper/110:04:171
111391260,0ptp4l0-21swapper/011:32:210
111391260,0ptp4l0-21swapper/010:05:520
111391260,0ptp4l0-21swapper/009:30:130
111391260,0ptp4l0-21swapper/008:25:140
111391260,0ptp4l0-21swapper/007:35:170
111391260,0ptp4l0-21swapper/007:14:410
111391250,1ptp4l14705-21fw_conntrack11:45:131
111391250,1ptp4l12139-21tr10:10:114
111391250,1ptp4l0-21swapper/011:02:490
111391250,0ptp4l696-21diskmemload11:20:100
111391250,0ptp4l0-21swapper/709:27:077
111391250,0ptp4l0-21swapper/510:58:155
111391250,0ptp4l0-21swapper/509:16:305
111391250,0ptp4l0-21swapper/509:11:355
111391250,0ptp4l0-21swapper/412:35:124
111391250,0ptp4l0-21swapper/412:35:124
111391250,0ptp4l0-21swapper/412:12:474
111391250,0ptp4l0-21swapper/411:44:084
111391250,0ptp4l0-21swapper/411:00:474
111391250,0ptp4l0-21swapper/309:36:383
111391250,0ptp4l0-21swapper/012:28:570
111391250,0ptp4l0-21swapper/012:11:380
111391250,0ptp4l0-21swapper/011:14:340
111391250,0ptp4l0-21swapper/010:45:210
111391250,0ptp4l0-21swapper/009:41:270
111391250,0ptp4l0-21swapper/009:12:280
111391250,0ptp4l0-21swapper/009:05:190
111391250,0ptp4l0-21swapper/008:30:210
111391240,1ptp4l5027-21/usr/sbin/munin11:30:191
111391240,1ptp4l3928-21cpuspeed_turbos08:05:115
111391240,1ptp4l3729-21fw_conntrack12:15:124
111391240,1ptp4l29041-21fw_conntrack12:05:114
111391240,1ptp4l2013-21kernelversion08:00:150
111391240,1ptp4l15688-21diskstats07:20:124
111391240,1ptp4l15688-21diskstats07:20:114
111391240,1ptp4l1061-21snmpd10:45:134
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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