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2026-08-29 - 11:38

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, slot #6

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
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rack3slot6s.osadl.org (updated Sat Aug 29, 2026 00:43:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
300532115104,6sleep10-21swapper/119:07:401
30192211086,19sleep00-21swapper/019:09:270
29460210387,11sleep30-21swapper/319:05:273
3011229979,15sleep20-21swapper/219:08:252
201932840,0sleep30-21swapper/322:58:373
161672830,0sleep00-21swapper/000:36:010
8802720,0sleep30-21swapper/322:05:063
317932720,0sleep00-21swapper/022:02:570
217922710,0sleep00-21swapper/020:10:000
30260994022,16cyclictest0-21swapper/023:25:110
3026299221,19cyclictest0-21swapper/221:45:112
30261992219,2cyclictest22607-21kworker/u8:023:31:041
30260992219,2cyclictest9869-21kworker/u8:122:42:040
3026099221,19cyclictest0-21swapper/023:55:130
30263992118,2cyclictest24917-21kworker/u8:022:35:043
30262992117,2cyclictest0-21swapper/221:00:102
30260992118,2cyclictest24917-21kworker/u8:022:30:040
30260992118,2cyclictest22636-21kworker/u8:100:22:040
3026099210,16cyclictest0-21swapper/023:42:040
189982210,1sleep118997-21irqstats00:05:161
30263992017,2cyclictest7535-21kworker/u8:121:38:043
30263992017,2cyclictest18569-21kworker/u8:021:58:013
30260992017,2cyclictest15640-21kworker/u8:222:27:040
216152200,1sleep229-21rcuc/221:18:142
30263991916,2cyclictest28557-21kworker/u8:223:25:043
30263991916,2cyclictest15640-21kworker/u8:222:22:043
3026299190,2cyclictest0-21swapper/220:00:112
30261991916,2cyclictest18569-21kworker/u8:021:57:051
30261991916,2cyclictest15660-21kworker/u8:123:28:041
30260991916,2cyclictest28557-21kworker/u8:223:22:050
30260991916,2cyclictest22607-21kworker/u8:023:33:050
30260991916,2cyclictest22605-21kworker/u8:021:20:050
30260991916,2cyclictest18569-21kworker/u8:021:58:050
30261991815,2cyclictest7535-21kworker/u8:121:37:041
3026199181,2cyclictest0-21swapper/122:35:041
3026099182,14cyclictest0-21swapper/019:55:110
30260991815,2cyclictest9869-21kworker/u8:122:45:040
30260991815,2cyclictest7446-21kworker/u8:121:26:040
30260991815,2cyclictest6264-21kworker/u8:200:18:050
30263991714,2cyclictest6264-21kworker/u8:200:27:043
30261991714,2cyclictest7446-21kworker/u8:121:10:041
30261991714,2cyclictest6264-21kworker/u8:200:30:041
30260991714,2cyclictest21396-21kworker/u8:223:39:040
3026099171,2cyclictest13253-21diskmemload22:35:040
30263991613,2cyclictest7446-21kworker/u8:121:25:043
30263991613,2cyclictest7446-21kworker/u8:121:21:043
30263991613,2cyclictest6264-21kworker/u8:223:53:043
30263991613,2cyclictest26957-21kworker/u8:023:47:043
30263991613,2cyclictest22636-21kworker/u8:100:15:043
30263991613,2cyclictest13689-21kworker/u8:221:18:063
3026299161,13cyclictest32480-21rm23:45:142
3026299160,14cyclictest22645-21ssh21:53:242
3026299160,13cyclictest0-21swapper/220:20:132
30261991613,2cyclictest7535-21kworker/u8:121:52:041
30261991613,2cyclictest22636-21kworker/u8:100:13:041
3026199160,2cyclictest0-21swapper/100:18:011
3026199160,14cyclictest0-21swapper/121:23:041
30260991613,2cyclictest30166-21kworker/u8:122:07:040
30260991613,2cyclictest26957-21kworker/u8:023:49:040
3026099161,13cyclictest0-21swapper/023:20:000
3026099161,13cyclictest0-21swapper/023:20:000
30260991611,3cyclictest0-21swapper/019:15:140
30263991512,2cyclictest9869-21kworker/u8:123:02:043
30263991512,2cyclictest9869-21kworker/u8:122:18:043
30263991512,2cyclictest24049-21kworker/u8:222:12:043
30263991512,2cyclictest1461-21kworker/u8:021:42:053
30263991512,2cyclictest11226-21kworker/u8:000:09:043
3026399150,13cyclictest0-21swapper/320:35:113
3026299151,12cyclictest8677-21ssh00:28:452
3026299151,12cyclictest11945-21ssh22:15:382
30262991510,3cyclictest23984-21munin-node2
3026299150,13cyclictest12365-21ssh00:32:052
30261991512,2cyclictest7446-21kworker/u8:121:28:051
30261991512,2cyclictest30541-21kworker/u8:119:54:041
30261991512,2cyclictest28557-21kworker/u8:223:13:041
30261991512,2cyclictest24049-21kworker/u8:222:11:041
30261991512,2cyclictest12484-21kworker/u8:222:58:041
3026199151,12cyclictest795-21python19:16:021
3026199150,2cyclictest13253-21diskmemload23:09:041
3026199150,2cyclictest0-21swapper/100:27:041
3026199150,14cyclictest0-21swapper/100:24:591
30260991512,2cyclictest7535-21kworker/u8:121:51:040
30260991512,2cyclictest1461-21kworker/u8:021:33:040
30260991512,2cyclictest12987-21kworker/u8:221:48:040
3026099150,2cyclictest0-21swapper/023:09:040
3026099150,2cyclictest0-21swapper/000:27:040
30263991411,2cyclictest6264-21kworker/u8:223:59:043
30263991411,2cyclictest28557-21kworker/u8:223:08:043
30263991411,2cyclictest22636-21kworker/u8:100:12:043
30263991411,2cyclictest1461-21kworker/u8:021:31:043
3026399140,2cyclictest0-21swapper/323:31:043
3026399140,12cyclictest3806-21perl23:15:143
3026399140,12cyclictest3806-21perl23:15:143
3026399140,12cyclictest0-21swapper/319:40:113
3026299149,3cyclictest31575-21iostat_ios23:10:152
3026299149,3cyclictest26911-21rm21:24:072
3026299149,3cyclictest0-21swapper/222:59:132
3026299149,3cyclictest0-21swapper/200:35:132
3026299142,6cyclictest0-21swapper/221:05:012
3026299141,2cyclictest3728-21runrttasks23:15:582
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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