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2026-01-04 - 11:04

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 Sun Jan 04, 2026 00:43:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2675421170,3sleep3177599cyclictest23:10:513
1671211695,16sleep30-21swapper/319:09:043
1435211493,16sleep00-21swapper/019:06:000
32413210687,12sleep10-21swapper/119:05:051
1695210080,15sleep20-21swapper/219:09:222
165822780,0sleep00-21swapper/023:36:180
270012750,0sleep10-21swapper/123:49:171
307212740,0sleep20-21swapper/223:53:072
252132710,1sleep10-21swapper/100:24:091
173832700,0sleep20-21swapper/223:37:442
1772995216,18cyclictest0-21swapper/019:25:120
177299350,9cyclictest18083-21diskmemload00:10:100
1774993012,16cyclictest0-21swapper/220:50:112
316382290,4sleep1177399cyclictest23:54:471
111382260,0sleep20-21swapper/223:30:182
177499221,19cyclictest20611-21ssh23:05:112
177299221,19cyclictest0-21swapper/019:35:120
177299211,18cyclictest0-21swapper/021:55:100
177499201,2cyclictest0-21swapper/223:00:132
177499200,18cyclictest0-21swapper/222:20:132
177299200,18cyclictest0-21swapper/022:20:140
90922190,0sleep00-21swapper/022:14:160
1774991914,3cyclictest11795-21kworker/u8:021:57:032
177499190,2cyclictest0-21swapper/219:25:122
177599172,3cyclictest18083-21diskmemload22:24:403
177599171,3cyclictest20640-21ssh21:11:503
1774991714,2cyclictest27052-21kworker/u8:123:14:042
1774991714,2cyclictest27052-21kworker/u8:122:52:052
1774991714,2cyclictest27052-21kworker/u8:122:41:052
1774991714,2cyclictest12198-21kworker/u8:200:14:052
177499170,12cyclictest0-21swapper/223:27:052
1775991613,2cyclictest22491-21kworker/u8:123:54:053
177599161,13cyclictest6943-21grep23:25:273
177599161,13cyclictest13785-21ssh21:41:103
1774991613,2cyclictest4015-21kworker/u8:021:01:032
1774991613,2cyclictest4015-21kworker/u8:020:57:062
1774991613,2cyclictest3425-21kworker/u8:219:20:042
1774991613,2cyclictest30010-21kworker/u8:120:18:052
1774991613,2cyclictest24990-21kworker/u8:121:28:042
1774991613,2cyclictest2248-21kworker/u8:021:32:042
1774991613,2cyclictest22452-21kworker/u8:220:32:042
1774991613,2cyclictest13750-21kworker/u8:019:38:042
177499161,13cyclictest0-21swapper/222:55:232
177499160,11cyclictest0-21swapper/222:33:062
177399160,14cyclictest0-21swapper/122:25:161
177299161,13cyclictest23097-21fschecks_count21:15:150
1772991611,3cyclictest22124-21turbostat20:04:550
177599151,3cyclictest23028-21iostat_ios20:00:163
1775991512,2cyclictest17381-21kworker/u8:100:26:053
1774991512,2cyclictest4601-21kworker/u8:223:55:052
1774991512,2cyclictest3425-21kworker/u8:219:11:042
1774991512,2cyclictest24751-21kworker/u8:322:16:042
1774991512,2cyclictest15859-21kworker/u8:119:58:042
1774991512,2cyclictest13750-21kworker/u8:019:42:042
1774991512,2cyclictest11795-21kworker/u8:021:41:032
1774991512,2cyclictest11724-21kworker/u8:221:12:042
177499151,12cyclictest26015-21taskset23:47:312
177499150,13cyclictest0-21swapper/221:18:412
177499150,11cyclictest0-21swapper/221:21:042
177499150,10cyclictest0-21swapper/220:44:052
177399159,4cyclictest0-21swapper/100:10:431
177299151,12cyclictest30409-21apt-get20:20:110
177299151,12cyclictest0-21swapper/023:05:520
1772991510,3cyclictest27088-21munin-node0
1772991510,3cyclictest27088-21munin-node0
177299150,3cyclictest0-21swapper/021:20:210
177599141,3cyclictest1208-21ssh23:20:103
177599141,2cyclictest6136-21aten2.4-expect20:40:153
1775991411,2cyclictest15953-21kworker/u8:122:25:043
1775991411,2cyclictest0-21swapper/323:03:513
1775991411,2cyclictest0-21swapper/322:13:003
177599140,2cyclictest0-21swapper/323:56:103
177599140,2cyclictest0-21swapper/323:31:303
177599140,2cyclictest0-21swapper/322:04:103
177599140,2cyclictest0-21swapper/321:50:403
177599140,2cyclictest0-21swapper/321:24:003
177599140,2cyclictest0-21swapper/300:06:103
177599140,12cyclictest0-21swapper/323:42:543
177599140,12cyclictest0-21swapper/323:16:503
177599140,12cyclictest0-21swapper/321:25:393
1774991411,2cyclictest7953-21kworker/u8:119:33:042
1774991411,2cyclictest7752-21kworker/u8:100:05:042
1774991411,2cyclictest4015-21kworker/u8:020:37:032
1774991411,2cyclictest27052-21kworker/u8:122:38:042
1774991411,2cyclictest27052-21kworker/u8:122:38:042
1774991411,2cyclictest24751-21kworker/u8:322:00:042
1774991411,2cyclictest22491-21kworker/u8:123:44:042
1774991411,2cyclictest18355-21kworker/u8:019:51:042
1774991411,2cyclictest18355-21kworker/u8:019:51:032
1774991411,2cyclictest17381-21kworker/u8:100:27:052
1774991411,2cyclictest1363-21kworker/u8:000:01:052
1774991411,2cyclictest12198-21kworker/u8:200:31:052
1774991411,2cyclictest11724-21kworker/u8:221:05:032
1774991411,2cyclictest0-21swapper/223:16:182
177499141,11cyclictest9299-21ssh22:14:402
177499140,12cyclictest3954-21sh22:08:022
177399146,6cyclictest18083-21diskmemload23:37:041
177399141,11cyclictest7545-21sh22:50:091
177399140,2cyclictest0-21swapper/121:20:121
177399140,12cyclictest688-21apt-get22:05:061
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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