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2026-09-23 - 22:03

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #3

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 rack5slot3s.osadl.org (updated Wed Sep 23, 2026 12:44:31)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
233152238163,24sleep30-21swapper/307:09:113
232362238163,24sleep20-21swapper/207:08:092
231802203164,26sleep00-21swapper/007:07:270
230462202164,25sleep10-21swapper/107:05:421
1702121820,4sleep02347099cyclictest09:20:140
143612990,3sleep02347099cyclictest09:14:550
124562960,2sleep20-21swapper/207:55:162
80022600,4sleep12347599cyclictest09:00:121
80022600,4sleep12347599cyclictest09:00:121
17572510,5sleep22348099cyclictest07:30:202
23480994533,3cyclictest0-21swapper/211:44:252
228692450,1sleep30-21swapper/310:45:213
2347599411,25cyclictest13744-21sh08:00:011
227682410,1sleep00-21swapper/012:00:140
2347599401,29cyclictest13413-21munin-run11:40:011
23487993926,8cyclictest0-21swapper/309:00:393
23487993926,8cyclictest0-21swapper/309:00:393
23475993912,18cyclictest0-21swapper/108:30:231
2347599381,2cyclictest0-21swapper/110:00:001
2347599381,27cyclictest0-21swapper/107:25:121
2347099388,14cyclictest7438-21munin-run12:40:010
2347099388,14cyclictest7438-21munin-run12:40:010
2348799371,19cyclictest0-21swapper/310:15:273
2347599374,29cyclictest23-21ksoftirqd/107:12:541
2347099379,12cyclictest3395-21basename08:50:010
23470993711,12cyclictest16581-21munin-run09:20:010
2348799361,19cyclictest0-21swapper/309:11:233
2348099368,4cyclictest23880-21cat12:00:282
2347599361,26cyclictest28502-21sort09:45:151
2348099350,26cyclictest0-21swapper/210:10:092
2348099350,26cyclictest0-21swapper/210:10:092
2347599357,13cyclictest19735-21tr10:40:111
2347599353,29cyclictest9616-21fschecks_count11:30:181
2347599351,3cyclictest30924-21cat07:25:011
2347599351,22cyclictest8339-21sed11:25:241
2347599351,22cyclictest8339-21sed11:25:241
23475993512,17cyclictest20350-21latency_hist08:15:021
2347599350,23cyclictest21507-21/usr/sbin/munin11:55:241
2348799341,24cyclictest0-21swapper/312:16:493
2348799341,24cyclictest0-21swapper/307:59:393
2348799341,14cyclictest0-21swapper/311:42:053
2347599343,18cyclictest9809-21processes10:15:221
2347599341,30cyclictest27389-21fschecks_time12:10:181
2347599341,2cyclictest0-21swapper/112:30:241
2347599341,19cyclictest18043-21/usr/sbin/munin11:50:221
2347599340,2cyclictest0-21swapper/107:45:231
2347599340,2cyclictest0-21swapper/107:45:231
2347599340,23cyclictest0-21swapper/108:15:261
2348799331,20cyclictest0-21swapper/308:01:073
2348799331,19cyclictest0-21swapper/309:39:433
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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