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2026-07-17 - 01:45

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 16, 2026 12:43:47)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
457729985,9sleep00-21swapper/007:09:190
438529583,8sleep20-21swapper/207:06:482
447829067,18sleep30-21swapper/307:08:023
249528669,13sleep10-21swapper/107:05:021
472199260,26cyclictest0-21swapper/211:20:252
472199260,26cyclictest0-21swapper/211:20:252
4721992512,2cyclictest311rcuc/210:57:032
472199250,2cyclictest0-21swapper/209:28:432
471799251,1cyclictest29954-21diskmemload10:52:301
472199245,2cyclictest0-21swapper/212:22:522
471799240,1cyclictest0-21swapper/110:05:541
4717992321,1cyclictest25-21ksoftirqd/110:27:251
4724992220,1cyclictest39-21ksoftirqd/310:25:053
4721992220,1cyclictest1430-21munin-run10:10:002
472199220,1cyclictest0-21swapper/212:16:052
472199220,0cyclictest0-21swapper/211:52:312
4717992216,2cyclictest25-21ksoftirqd/110:38:511
4724992120,1cyclictest0-21swapper/310:30:133
472499210,0cyclictest0-21swapper/311:19:343
4721992116,4cyclictest0-21swapper/209:35:022
471799210,5cyclictest0-21swapper/110:10:571
471799210,4cyclictest24895-21taskset12:38:561
471799210,1cyclictest0-21swapper/111:52:001
4724992019,1cyclictest0-21swapper/311:54:423
472199209,9cyclictest29954-21diskmemload11:44:142
472199209,11cyclictest0-21swapper/210:52:302
472199208,8cyclictest0-21swapper/209:52:192
472199205,1cyclictest0-21swapper/209:13:042
472199205,14cyclictest0-21swapper/208:15:142
4721992014,4cyclictest29954-21diskmemload10:24:582
4721992012,7cyclictest0-21swapper/209:59:442
472199200,2cyclictest0-21swapper/210:45:182
472199200,0cyclictest0-21swapper/211:07:282
471799204,3cyclictest25-21ksoftirqd/112:30:201
471799200,0cyclictest141rcu_preempt10:23:191
471599206,7cyclictest31422-21munin-run09:30:000
471599204,6cyclictest3523-21apt-get10:50:020
471599201,18cyclictest0-21swapper/009:36:150
4721991918,1cyclictest29954-21diskmemload12:10:012
472199190,3cyclictest0-21swapper/211:12:432
4717991917,1cyclictest38150irq/131-snd_hda09:55:101
471599197,6cyclictest20720-21awk11:00:000
472499180,16cyclictest0-21swapper/312:10:493
472199182,2cyclictest0-21swapper/211:18:172
4721991813,5cyclictest29954-21diskmemload12:27:102
4721991812,5cyclictest7599-21/usr/sbin/munin09:15:192
4721991811,1cyclictest29954-21diskmemload10:19:392
472199180,2cyclictest10914-21ls12:30:172
4717991817,0cyclictest251ksoftirqd/111:28:391
471799180,16cyclictest0-21swapper/112:12:121
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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