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2026-06-18 - 16:33

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, slot #7

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 50 highest latencies:
System rack7slot7s.osadl.org (updated Thu Jun 18, 2026 12:43:50)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2566921070,1sleep025661-21sensors10:25:240
78829684,8sleep00-21swapper/007:06:090
86229077,9sleep20-21swapper/207:07:072
3193528874,9sleep30-21swapper/307:05:163
102828265,13sleep10-21swapper/107:09:151
119199250,2cyclictest0-21swapper/310:00:403
183792240,0sleep20-21swapper/212:16:262
176132230,9sleep013-21ksoftirqd/008:50:130
118699230,23cyclictest0-21swapper/211:01:372
118299230,1cyclictest0-21swapper/111:11:221
118099233,8cyclictest0-21swapper/012:30:120
119199221,20cyclictest0-21swapper/311:13:013
119199220,22cyclictest0-21swapper/311:50:093
118699221,16cyclictest0-21swapper/208:05:142
118299220,22cyclictest0-21swapper/111:29:561
1191992117,3cyclictest26877-21diskmemload10:50:243
119199210,20cyclictest0-21swapper/309:44:063
118299217,8cyclictest0-21swapper/112:00:121
1182992119,1cyclictest0-21swapper/107:40:131
118099210,20cyclictest0-21swapper/008:55:120
118699201,1cyclictest21489-21apt-get09:45:112
118699200,17cyclictest0-21swapper/210:13:362
118299191,18cyclictest30432-21kworker/u8:110:29:041
118299190,18cyclictest0-21swapper/111:35:261
69652180,0sleep00-21swapper/010:53:010
1191991817,1cyclictest0-21swapper/310:13:023
118699180,1cyclictest0-21swapper/210:38:422
118299180,17cyclictest0-21swapper/110:13:371
118099180,2cyclictest0-21swapper/010:31:050
118099180,16cyclictest0-21swapper/011:25:140
119199172,15cyclictest0-21swapper/311:38:503
1191991717,0cyclictest0-21swapper/312:12:403
1186991717,0cyclictest0-21swapper/210:31:012
118699170,2cyclictest0-21swapper/212:35:342
1182991715,1cyclictest16505-21sed08:45:241
1180991716,1cyclictest0-21swapper/012:23:270
1180991712,3cyclictest28015-21diskstats09:10:150
118099170,1cyclictest0-21swapper/011:47:150
119199160,15cyclictest39-21ksoftirqd/309:10:533
118699168,4cyclictest225-21systemd-journal08:23:112
1186991615,1cyclictest32-21ksoftirqd/212:05:162
1186991611,3cyclictest5900-21cron07:20:002
118299160,16cyclictest0-21swapper/111:51:321
1180991615,1cyclictest0-21swapper/010:01:320
118099160,2cyclictest141rcu_preempt09:34:070
1191991515,0cyclictest0-21swapper/310:25:023
1191991511,4cyclictest0-21swapper/312:36:563
119199150,14cyclictest0-21swapper/309:52:463
119199150,0cyclictest0-21swapper/312:33:243
1182991512,1cyclictest26877-21diskmemload11:17:561
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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