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2026-07-30 - 16:11

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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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 Jul 30, 2026 12:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
23216210164,33sleep20-21swapper/207:07:062
2317429179,8sleep00-21swapper/007:06:330
2327428774,9sleep30-21swapper/307:07:523
2325728258,13sleep10-21swapper/107:07:371
134372380,0sleep30-21swapper/309:01:243
2353199300,30cyclictest0-21swapper/312:16:393
2352399240,22cyclictest0-21swapper/111:07:331
2352799230,23cyclictest0-21swapper/212:24:402
23523992322,1cyclictest38150irq/131-snd_hda12:06:181
23523992216,5cyclictest1428-21grep11:15:161
2353199213,1cyclictest0-21swapper/310:56:313
23531992120,1cyclictest0-21swapper/310:30:103
2352399212,4cyclictest141rcu_preempt11:54:501
2352399212,4cyclictest141rcu_preempt11:54:491
23523992119,1cyclictest22338-21apt-get08:15:131
23523992114,7cyclictest0-21swapper/111:46:411
2352399210,0cyclictest0-21swapper/112:28:211
2351799210,17cyclictest0-21swapper/012:30:130
23531992015,5cyclictest16120-21diskmemload09:50:443
2353199200,3cyclictest0-21swapper/311:48:153
2352399200,1cyclictest3615-21if_enp2s011:55:181
250002190,0sleep00-21swapper/009:15:020
2353199199,8cyclictest0-21swapper/310:01:313
23531991918,1cyclictest0-21swapper/311:34:173
23531991917,1cyclictest16120-21diskmemload10:19:243
23531991917,1cyclictest16120-21diskmemload09:40:213
23531991917,1cyclictest0-21swapper/312:25:023
2352799190,19cyclictest0-21swapper/209:19:502
2352799190,18cyclictest4960-21kworker/u8:211:38:142
23523991918,1cyclictest38150irq/131-snd_hda10:37:531
2352399190,18cyclictest0-21swapper/109:18:331
2351799194,4cyclictest0-21swapper/009:20:300
23517991918,1cyclictest0-21swapper/012:10:160
2353199187,11cyclictest0-21swapper/308:30:153
23531991816,1cyclictest16120-21diskmemload10:22:593
23531991814,3cyclictest16120-21diskmemload11:27:123
23531991813,5cyclictest0-21swapper/310:12:153
2352799181,3cyclictest16120-21diskmemload12:29:062
23523991817,1cyclictest0-21swapper/112:15:231
2352399180,18cyclictest0-21swapper/112:22:131
2352399180,18cyclictest0-21swapper/110:54:341
2352399180,17cyclictest2903-21cpu09:40:161
2353199178,7cyclictest16120-21diskmemload09:18:153
2352799173,11cyclictest3767-21runrttasks10:00:012
2352799170,16cyclictest0-21swapper/211:16:272
2352799170,0cyclictest0-21swapper/211:57:482
2352399173,13cyclictest16120-21diskmemload11:30:251
23523991716,1cyclictest0-21swapper/110:44:441
2352399170,17cyclictest0-21swapper/110:16:361
2353199168,7cyclictest0-21swapper/307:50:133
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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