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2026-04-14 - 13:29

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #b, 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 rackbslot8s (updated Tue Apr 14, 2026 00:44:19)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
263692117103,9sleep60-21swapper/619:06:346
26289211789,10sleep00-21swapper/019:05:230
263952116102,9sleep30-21swapper/319:06:543
26308211499,10sleep10-21swapper/119:05:401
26291211499,10sleep20-21swapper/219:05:252
26417211298,9sleep50-21swapper/519:07:135
26311211298,9sleep40-21swapper/419:05:444
26343210893,10sleep70-21swapper/719:06:117
26837991030,100cyclictest0-21swapper/200:09:072
268329910399,4cyclictest553-21snmpd21:13:501
2685299102100,2cyclictest553-21snmpd23:15:306
268469910299,2cyclictest553-21snmpd22:56:174
268379910299,3cyclictest553-21snmpd22:32:162
26837991020,1cyclictest0-21swapper/223:49:492
26837991020,1cyclictest0-21swapper/223:49:492
268329910296,3cyclictest553-21snmpd23:38:461
26832991020,102cyclictest0-21swapper/121:41:381
268289910299,3cyclictest553-21snmpd23:11:590
268569910199,2cyclictest0-21swapper/723:00:277
268529910199,2cyclictest553-21snmpd21:28:596
268529910199,2cyclictest553-21snmpd00:35:296
268529910199,1cyclictest235530-21kworker/6:000:20:086
268529910199,1cyclictest203239-21kworker/6:022:57:536
2685299101100,1cyclictest70841-21kworker/6:021:24:026
2685299101100,1cyclictest70841-21kworker/6:020:35:136
2685299101100,1cyclictest570-21ntpd22:21:586
2685299101100,1cyclictest235530-21kworker/6:023:55:136
2685299101100,1cyclictest235530-21kworker/6:023:55:126
2685299101100,1cyclictest235530-21kworker/6:023:49:456
2685299101100,1cyclictest235530-21kworker/6:023:49:446
2685299101100,1cyclictest235530-21kworker/6:000:26:176
2685299101100,1cyclictest235530-21kworker/6:000:05:286
2685299101100,1cyclictest235530-21kworker/6:000:04:036
2685299101100,1cyclictest104722-21kworker/6:122:44:426
2685299101100,1cyclictest104722-21kworker/6:122:09:286
2685299101100,1cyclictest104722-21kworker/6:121:42:086
26852991010,100cyclictest0-21swapper/619:23:236
268489910199,2cyclictest553-21snmpd23:31:515
268489910199,2cyclictest553-21snmpd21:52:185
26848991010,100cyclictest0-21swapper/523:39:395
26848991010,100cyclictest0-21swapper/522:52:515
268469910199,2cyclictest553-21snmpd22:16:164
2684699101100,1cyclictest553-21snmpd23:01:444
268419910199,2cyclictest553-21snmpd22:50:383
268379910199,2cyclictest553-21snmpd23:09:512
268379910199,2cyclictest553-21snmpd00:13:182
268379910198,3cyclictest553-21snmpd20:27:432
2683799101100,1cyclictest553-21snmpd00:27:112
26837991010,99cyclictest88387-21diskmemload23:26:272
26837991010,101cyclictest0-21swapper/220:02:422
26837991010,100cyclictest0-21swapper/221:30:162
268329910198,3cyclictest553-21snmpd21:21:061
268289910199,2cyclictest553-21snmpd19:17:080
268289910199,2cyclictest553-21snmpd19:17:070
268289910198,3cyclictest553-21snmpd23:06:120
26828991010,100cyclictest0-21swapper/022:40:130
268569910099,1cyclictest0-21swapper/720:20:107
268569910099,1cyclictest0-21swapper/719:16:377
268569910099,1cyclictest0-21swapper/719:16:377
26856991000,99cyclictest0-21swapper/723:42:577
26856991000,99cyclictest0-21swapper/722:57:577
26856991000,99cyclictest0-21swapper/720:36:167
26856991000,99cyclictest0-21swapper/719:34:407
268529910099,1cyclictest70841-21kworker/6:021:17:166
268529910099,1cyclictest70841-21kworker/6:021:10:216
268529910099,1cyclictest70841-21kworker/6:020:57:166
268529910099,1cyclictest70841-21kworker/6:020:40:156
268529910099,1cyclictest55358-21kworker/6:120:10:196
268529910099,1cyclictest553-21snmpd20:02:476
268529910099,1cyclictest37536-21kworker/6:019:50:176
268529910099,1cyclictest37536-21kworker/6:019:45:196
268529910099,1cyclictest37536-21kworker/6:019:35:146
268529910099,1cyclictest235530-21kworker/6:023:52:186
268529910099,1cyclictest235530-21kworker/6:023:40:096
268529910099,1cyclictest235530-21kworker/6:023:37:306
268529910099,1cyclictest235530-21kworker/6:023:30:126
268529910099,1cyclictest235530-21kworker/6:023:25:586
268529910099,1cyclictest235530-21kworker/6:000:30:496
268529910099,1cyclictest235530-21kworker/6:000:16:066
268529910099,1cyclictest16651-21kworker/6:219:10:176
268529910099,1cyclictest16651-21kworker/6:219:10:166
268529910099,1cyclictest104722-21kworker/6:123:20:556
268529910099,1cyclictest104722-21kworker/6:123:10:286
268529910099,1cyclictest104722-21kworker/6:123:00:266
268529910099,1cyclictest104722-21kworker/6:122:51:076
268529910099,1cyclictest104722-21kworker/6:122:46:186
268529910099,1cyclictest104722-21kworker/6:122:37:466
268529910099,1cyclictest104722-21kworker/6:122:32:386
268529910099,1cyclictest104722-21kworker/6:122:27:576
268529910099,1cyclictest104722-21kworker/6:122:15:166
268529910099,1cyclictest104722-21kworker/6:122:10:026
268529910099,1cyclictest104722-21kworker/6:122:00:196
268529910099,1cyclictest104722-21kworker/6:121:50:106
268529910099,1cyclictest104722-21kworker/6:121:46:226
268529910099,1cyclictest104722-21kworker/6:121:36:456
268529910099,1cyclictest104722-21kworker/6:121:30:096
268529910098,2cyclictest235530-21kworker/6:000:12:546
268489910099,1cyclictest553-21snmpd20:40:225
26848991000,99cyclictest0-21swapper/520:18:105
26848991000,99cyclictest0-21swapper/500:28:515
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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