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2026-09-02 - 04:16

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #1, 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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  Intel
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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 50 highest latencies:
System rack1slot6s.osadl.org (updated Wed Sep 02, 2026 00:43:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2194991360,5rtkit-daemon12-21rcu_preempt21:33:101
1497421140,7sleep114975-21grep21:14:531
2194991130,5rtkit-daemon12-21rcu_preempt22:05:021
2194991120,6rtkit-daemon0-21swapper/022:04:171
2194991000,6rtkit-daemon0-21swapper/019:14:080
219499990,9rtkit-daemon0-21swapper/022:08:460
25350999818,58cyclictest10824-21ssh21:56:210
2535099974,73cyclictest0-21swapper/019:41:280
219499970,8rtkit-daemon28517-21aten_r1power_po22:24:460
219499970,8rtkit-daemon28517-21aten_r1power_po22:24:460
2535099954,12cyclictest0-21swapper/020:43:450
2535099954,12cyclictest0-21swapper/020:15:010
2535099944,12cyclictest0-21swapper/020:35:100
2535399934,70cyclictest0-21swapper/221:19:502
2535399933,83cyclictest0-21swapper/222:54:482
2535099934,13cyclictest0-21swapper/022:44:480
2535099934,12cyclictest0-21swapper/018:44:560
2535099934,10cyclictest1227-21runrttasks17:58:170
2535099933,66cyclictest23697-21ntpdc23:05:000
2535399924,81cyclictest0-21swapper/221:29:082
2535399923,81cyclictest4845-21telnet20:09:522
2535399923,81cyclictest31950-21cpuspeed22:29:482
2535099929,69cyclictest0-21swapper/019:55:110
25350999217,58cyclictest0-21swapper/020:29:520
219499920,8rtkit-daemon0-21swapper/020:12:580
2535399914,69cyclictest0-21swapper/220:49:512
25353999129,54cyclictest2225-21grep19:04:592
25353999129,54cyclictest2225-21grep19:04:592
2535099914,9cyclictest1227-21runrttasks21:52:280
2535099914,65cyclictest0-21swapper/019:46:130
2535099914,13cyclictest0-21swapper/022:22:010
2535099914,13cyclictest0-21swapper/021:40:030
2535099914,13cyclictest0-21swapper/021:09:540
2535099913,67cyclictest0-21swapper/021:34:570
25350999117,53cyclictest107550irq/46-eth022:09:550
2535399907,75cyclictest0-21swapper/220:59:532
2535099906,66cyclictest17578-21diskmemload20:25:050
2535099906,66cyclictest17578-21diskmemload20:25:050
2535099904,9cyclictest1227-21runrttasks18:36:540
2535099904,66cyclictest5362-21diskstats20:59:550
2535099904,13cyclictest0-21swapper/022:00:200
2535099904,12cyclictest0-21swapper/020:07:060
2535099904,11cyclictest0-21swapper/023:03:170
2535099904,11cyclictest0-21swapper/022:31:000
2535099903,64cyclictest0-21swapper/018:29:560
2535099903,12cyclictest0-21swapper/021:05:340
2535099903,12cyclictest0-21swapper/021:05:340
2535399894,65cyclictest0-21swapper/223:05:102
2535099894,64cyclictest0-21swapper/020:24:140
2535099894,14cyclictest0-21swapper/020:54:540
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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