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2026-08-23 - 10:03

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 Aug 23, 2026 00:43:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
74002117106,6sleep30-21swapper/319:09:413
7412210986,18sleep00-21swapper/019:09:490
5630210987,16sleep10-21swapper/119:05:011
6696210584,16sleep20-21swapper/219:05:472
241892860,0sleep20-21swapper/222:15:282
326582750,1sleep30-21swapper/323:30:443
215762750,0sleep10-21swapper/122:13:181
11362720,0sleep20-21swapper/200:39:512
109012690,1sleep2301ktimersoftd/219:16:032
7455992822,2cyclictest8876-21kworker/u8:023:47:041
7455992522,2cyclictest26534-21kworker/u8:023:28:011
142712230,1sleep214277-21fschecks_time23:45:152
7457992219,2cyclictest22968-21kworker/u8:222:18:043
7457992219,2cyclictest18029-21kworker/u8:000:37:033
7457992118,2cyclictest9593-21kworker/u8:023:12:043
7457992118,2cyclictest10489-21kworker/u8:022:33:053
745699210,15cyclictest0-21swapper/221:43:042
7455992118,2cyclictest28338-21kworker/u8:122:42:011
7455992118,2cyclictest24307-21kworker/u8:221:45:051
248262210,1sleep10-21swapper/121:43:521
7457992017,2cyclictest24307-21kworker/u8:222:07:053
745799200,18cyclictest0-21swapper/323:47:053
745699201,2cyclictest0-21swapper/223:25:112
745599202,16cyclictest3428-21kworker/u8:123:12:051
7455992017,2cyclictest7039-21kworker/u8:000:12:021
745599200,18cyclictest0-21swapper/122:33:041
745499200,2cyclictest0-21swapper/023:25:110
7457991916,2cyclictest3428-21kworker/u8:123:18:043
745799190,2cyclictest0-21swapper/323:28:013
7455991916,2cyclictest8003-21kworker/u8:021:38:041
7455991916,2cyclictest17887-21kworker/u8:222:50:011
7455991915,2cyclictest28238-21kworker/u8:000:01:051
745599190,2cyclictest0-21swapper/122:18:041
7457991815,2cyclictest8003-21kworker/u8:021:27:043
7457991815,2cyclictest28238-21kworker/u8:000:03:043
7457991815,2cyclictest21327-21kworker/u8:119:46:013
7457991815,2cyclictest17887-21kworker/u8:222:42:053
7455991815,2cyclictest8003-21kworker/u8:021:26:041
7455991815,2cyclictest21064-21kworker/u8:223:37:051
7455991815,2cyclictest20506-21kworker/u8:123:52:041
7455991815,2cyclictest10489-21kworker/u8:022:02:041
7457991714,2cyclictest8003-21kworker/u8:021:42:023
7457991714,2cyclictest24307-21kworker/u8:221:57:043
7457991714,2cyclictest24307-21kworker/u8:221:49:043
7455991714,2cyclictest28338-21kworker/u8:122:23:051
7455991714,2cyclictest27249-21kworker/u8:121:23:051
7455991714,2cyclictest18029-21kworker/u8:000:37:071
7455991714,2cyclictest17887-21kworker/u8:222:49:051
745599171,14cyclictest356-21apt-get00:05:121
745599170,2cyclictest0-21swapper/122:07:041
745599170,15cyclictest0-21swapper/119:46:011
7457991613,2cyclictest8876-21kworker/u8:023:42:043
7457991613,2cyclictest3428-21kworker/u8:123:05:043
7457991613,2cyclictest3245-21kworker/u8:219:16:053
7457991613,2cyclictest20506-21kworker/u8:100:09:043
7457991613,2cyclictest17887-21kworker/u8:223:00:053
7457991613,2cyclictest17435-21kworker/u8:021:11:043
7457991613,2cyclictest1618-21kworker/u8:121:54:043
7457991613,2cyclictest10489-21kworker/u8:022:03:043
745799161,13cyclictest19000-21munin-node3
745799160,2cyclictest28360-21fschecks_time20:00:163
745699162,8cyclictest22749-21ssh22:15:002
7456991611,3cyclictest23520-21diskmemload22:25:172
745699161,13cyclictest0-21swapper/221:00:152
7455991613,2cyclictest9593-21kworker/u8:023:16:041
7455991613,2cyclictest8003-21kworker/u8:021:34:051
7455991613,2cyclictest3428-21kworker/u8:123:20:041
7455991613,2cyclictest24053-21kworker/u8:200:33:041
745599161,13cyclictest11303-21sh23:09:291
745599161,13cyclictest0-21swapper/119:36:031
745599160,2cyclictest0-21swapper/123:32:011
745499161,3cyclictest15984-21grep20:50:120
7457991512,2cyclictest7039-21kworker/u8:000:13:053
7457991512,2cyclictest3245-21kworker/u8:219:11:043
7457991512,2cyclictest28338-21kworker/u8:122:26:053
7457991512,2cyclictest23530-21kworker/u8:220:36:053
7457991512,2cyclictest17887-21kworker/u8:222:48:013
7457991512,2cyclictest17435-21kworker/u8:021:18:053
745799150,13cyclictest0-21swapper/322:50:013
745799150,13cyclictest0-21swapper/320:40:133
745699151,3cyclictest0-21swapper/223:20:492
745699151,12cyclictest31295-21sendmail-mta22:24:322
7456991510,3cyclictest14351-21munin-node2
7456991510,3cyclictest0-21swapper/220:20:182
745699150,13cyclictest0-21swapper/223:53:172
745699150,13cyclictest0-21swapper/221:38:582
745599151,2cyclictest14237-21perl19:25:141
7455991512,2cyclictest353-21aten2.4_r3power22:25:121
7455991512,2cyclictest3428-21kworker/u8:123:04:011
7455991512,2cyclictest28780-21kworker/u8:022:58:041
7455991512,2cyclictest24307-21kworker/u8:221:50:041
7455991512,2cyclictest21064-21kworker/u8:223:57:041
7455991512,2cyclictest17435-21kworker/u8:021:10:041
7455991512,2cyclictest0-21swapper/121:16:221
745599151,12cyclictest9464-21munin-run19:15:001
745599150,13cyclictest0-21swapper/119:16:051
745499150,2cyclictest15909-21missed_timers00:20:180
7457991411,2cyclictest23530-21kworker/u8:220:21:043
7457991411,2cyclictest17435-21kworker/u8:021:20:013
7457991411,2cyclictest17435-21kworker/u8:020:57:043
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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