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2026-05-25 - 20:33

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 Mon May 25, 2026 12:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2235929463,9sleep20-21swapper/207:08:562
2239929267,9sleep00-21swapper/007:09:270
2223829277,11sleep30-21swapper/307:07:203
2234828871,13sleep10-21swapper/107:08:471
286272720,0sleep10-21swapper/109:36:471
85452520,0sleep10-21swapper/110:04:121
190072460,0sleep10-21swapper/109:30:461
22533992716,5cyclictest25-21ksoftirqd/110:23:451
2253899260,26cyclictest0-21swapper/312:30:123
2253399260,25cyclictest0-21swapper/111:14:321
2253699240,24cyclictest0-21swapper/211:03:212
2253399241,2cyclictest141rcu_preempt11:02:371
2252999240,24cyclictest0-21swapper/010:54:010
2252999240,24cyclictest0-21swapper/010:54:010
2253699230,21cyclictest0-21swapper/211:21:502
22533992322,1cyclictest0-21swapper/111:34:161
2253399227,1cyclictest141rcu_preempt12:03:511
22533992214,7cyclictest25-21ksoftirqd/109:12:431
22533992214,7cyclictest25-21ksoftirqd/109:12:421
2253399220,21cyclictest20679-21latency10:30:191
2253399220,1cyclictest0-21swapper/111:22:121
2253899214,2cyclictest141rcu_preempt12:18:533
22536992120,1cyclictest0-21swapper/210:37:422
2253699210,1cyclictest141rcu_preempt12:14:052
2253399214,1cyclictest141rcu_preempt11:58:431
2253399211,19cyclictest25-21ksoftirqd/110:25:201
2253399210,21cyclictest0-21swapper/112:35:221
2253399210,21cyclictest0-21swapper/112:35:211
2253399210,19cyclictest0-21swapper/107:40:271
2252999210,3cyclictest0-21swapper/012:02:460
22538992019,1cyclictest0-21swapper/311:54:073
22538992017,1cyclictest0-21swapper/307:10:123
22536992018,1cyclictest32-21ksoftirqd/211:11:252
2253699201,2cyclictest0-21swapper/211:45:012
2253699200,1cyclictest141rcu_preempt12:39:382
2253699200,1cyclictest141rcu_preempt12:39:372
2253699200,19cyclictest0-21swapper/210:51:022
2253699200,19cyclictest0-21swapper/210:51:012
2253699200,18cyclictest0-21swapper/210:59:542
2253399204,2cyclictest141rcu_preempt10:17:531
2253399200,1cyclictest0-21swapper/109:57:231
2252999207,7cyclictest9129-21munin-run07:50:000
22538991915,1cyclictest39-21ksoftirqd/309:22:323
2253899190,19cyclictest0-21swapper/310:03:163
2253699191,18cyclictest0-21swapper/210:00:352
22536991910,6cyclictest32-21ksoftirqd/210:13:262
2253699190,19cyclictest0-21swapper/211:28:292
2253699190,19cyclictest0-21swapper/209:43:122
2253399195,13cyclictest795-21apt-get09:40:121
2253399191,6cyclictest0-21swapper/110:43:371
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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