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2026-04-13 - 08:52
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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, lowest P state: performance
Characteristics of the 100 highest latencies:
System rackdslot1.osadl.org (updated Mon Apr 13, 2026 00:45:43)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1626321660,7sleep0909899cyclictest20:35:160
910199646,16cyclictest2117-21grep20:05:123
134491640,6ptp4l0-21swapper/019:05:190
910199604,15cyclictest16128-21/usr/sbin/munin21:45:153
910199604,11cyclictest13581-21latency_hist21:40:003
910199604,11cyclictest13581-21latency_hist21:40:003
254522600,4sleep30-21swapper/319:45:163
134491600,4ptp4l0-21swapper/120:50:271
134491600,4ptp4l0-21swapper/120:50:271
134491570,4ptp4l0-21swapper/122:15:421
134491570,4ptp4l0-21swapper/121:15:171
134491570,3ptp4l0-21swapper/221:20:322
134491570,3ptp4l0-21swapper/121:05:271
152582560,4sleep00-21swapper/022:50:260
152582560,4sleep00-21swapper/022:50:260
134491560,9ptp4l0-21swapper/221:18:212
134491560,5ptp4l0-21swapper/119:08:461
134491560,4ptp4l0-21swapper/122:37:101
134491560,4ptp4l0-21swapper/121:43:171
134491550,4ptp4l0-21swapper/123:38:481
134491550,4ptp4l0-21swapper/122:09:231
134491550,4ptp4l0-21swapper/120:16:491
134491550,3ptp4l0-21swapper/200:10:242
134491540,4ptp4l0-21swapper/220:31:212
134491540,4ptp4l0-21swapper/200:21:322
134491540,4ptp4l0-21swapper/123:57:351
134491540,4ptp4l0-21swapper/000:35:340
134491540,3ptp4l0-21swapper/022:55:210
134491540,11ptp4l6310-21apt-get19:05:022
910199524,9cyclictest0-21swapper/319:15:123
134491520,4ptp4l0-21swapper/121:45:431
134491520,4ptp4l0-21swapper/120:06:011
134491520,3ptp4l0-21swapper/022:30:140
134491520,12ptp4l33-21ksoftirqd/222:45:282
910199516,11cyclictest0-21swapper/322:51:083
910199516,11cyclictest0-21swapper/322:51:083
910099512,46cyclictest0-21swapper/219:35:192
134491510,9ptp4l0-21swapper/000:20:300
134491510,5ptp4l0-21swapper/219:17:542
134491510,5ptp4l0-21swapper/200:38:212
134491510,4ptp4l0-21swapper/219:20:272
134491510,4ptp4l0-21swapper/020:08:470
134491510,3ptp4l0-21swapper/220:08:342
134491510,3ptp4l0-21swapper/219:48:012
134491510,11ptp4l0-21swapper/221:52:452
134491500,5ptp4l0-21swapper/221:44:352
134491500,5ptp4l0-21swapper/123:05:101
134491500,4ptp4l0-21swapper/120:49:591
134491500,4ptp4l0-21swapper/023:42:360
910199497,7cyclictest17023-21iostat00:05:173
910199496,6cyclictest0-21swapper/319:42:183
134491490,4ptp4l0-21swapper/120:11:271
134491490,4ptp4l0-21swapper/100:27:561
134491490,3ptp4l0-21swapper/200:29:142
134491490,3ptp4l0-21swapper/022:28:220
134491490,12ptp4l0-21swapper/023:48:510
134491490,11ptp4l0-21swapper/319:05:133
910199487,6cyclictest0-21swapper/320:41:143
134491480,4ptp4l0-21swapper/120:23:471
134491480,4ptp4l0-21swapper/100:03:571
134491480,4ptp4l0-21swapper/020:00:530
134491480,3ptp4l0-21swapper/219:29:422
134491480,3ptp4l0-21swapper/119:15:131
910199476,7cyclictest30578-21apt-config00:35:003
910199476,11cyclictest0-21swapper/321:21:303
910199475,11cyclictest0-21swapper/319:24:443
910199473,6cyclictest134491ptp4l00:30:223
910199472,11cyclictest22133-21timerwakeupswit20:45:273
910199471,18cyclictest0-21swapper/320:15:163
134491470,5ptp4l33-21ksoftirqd/219:56:532
134491470,4ptp4l0-21swapper/222:12:532
134491470,4ptp4l0-21swapper/021:21:070
134491470,3ptp4l0-21swapper/221:47:272
134491470,3ptp4l0-21swapper/121:58:171
910199465,8cyclictest8127-21ntpq23:45:223
134491460,8ptp4l0-21swapper/023:50:030
910199456,5cyclictest0-21swapper/320:30:463
910199455,8cyclictest26582-21ls22:05:213
910199452,8cyclictest26755-21ps23:15:283
910199450,11cyclictest8163-21ntpq22:35:223
134491450,5ptp4l32474-21apt-get22:20:133
134491450,5ptp4l0-21swapper/023:10:200
134491450,4ptp4l27547-21apt-get19:50:131
134491450,4ptp4l12949-21ls21:35:270
134491450,4ptp4l12949-21ls21:35:270
134491450,3ptp4l0-21swapper/123:45:561
134491450,3ptp4l0-21swapper/120:30:191
134491450,11ptp4l0-21swapper/222:40:432
910199446,5cyclictest0-21swapper/320:00:273
910199446,14cyclictest30139-21/usr/sbin/munin22:15:273
134491440,9ptp4l0-21swapper/221:02:332
134491440,4ptp4l13745-21apt-get19:20:111
134491440,3ptp4l321ktimersoftd/222:09:102
134491440,3ptp4l0-21swapper/222:35:332
134491440,3ptp4l0-21swapper/122:49:321
910199435,11cyclictest0-21swapper/322:28:143
910099431,40cyclictest1488-21kworker/2:123:42:272
134491430,9ptp4l0-21swapper/119:37:521
134491430,9ptp4l0-21swapper/100:11:441
134491430,5ptp4l17255-21ps19:25:231
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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