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2026-10-27 - 03:05

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, 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 rackcslot7s.osadl.org (updated Mon Oct 26, 2026 12:44:42)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
360888321320,2sleep00-21swapper/010:40:150
360874221280,2sleep10-21swapper/110:40:121
35323762940,7sleep013-21ksoftirqd/007:05:120
353224726743,14sleep20-21swapper/207:05:122
353354226344,13sleep10-21swapper/107:08:051
353348226343,14sleep30-21swapper/307:07:173
35988232410,3sleep00-21swapper/010:10:190
36222412380,2sleep33056-21PK-Backend11:20:013
36164692310,3chrt3056-21PK-Backend11:00:233
3533830992915,12cyclictest3550267-21unin-run07:55:002
3533832992814,5cyclictest42-21ksoftirqd/307:59:463
353383299278,17cyclictest436-20systemd-journal08:39:593
353383099264,14cyclictest34-21ksoftirqd/211:20:012
139099260,4rtkit-daemon1389-21rtkit-daemon08:26:151
353383299256,5cyclictest42-21ksoftirqd/308:10:003
3533832992514,4cyclictest42-21ksoftirqd/308:25:283
3533832992513,9cyclictest883-21dbus-daemon11:45:013
139099250,4rtkit-daemon1389-21rtkit-daemon12:12:530
139099250,4rtkit-daemon1389-21rtkit-daemon10:05:050
3533832992419,4cyclictest42-21ksoftirqd/309:05:013
3533832992413,10cyclictest42-21ksoftirqd/308:44:593
3533832992410,4cyclictest42-21ksoftirqd/310:43:433
3533832992410,4cyclictest42-21ksoftirqd/310:02:163
3533830992411,11cyclictest3627326-21unin-run11:34:592
3533824992414,8cyclictest3582806-21cat09:25:190
353383299236,4cyclictest3629167-21latency_hist11:40:013
353383299232,17cyclictest978-21snmpd07:41:503
3533832992320,2cyclictest3056-21PK-Backend10:39:143
3533832992312,10cyclictest411rcuc/310:19:153
3533832992311,4cyclictest42-21ksoftirqd/309:25:313
353383099233,2cyclictest141rcu_preempt11:00:062
353383099230,21cyclictest3649517-21df_inode12:35:142
353382799230,21cyclictest3056-21PK-Backend08:39:121
353383299229,12cyclictest42-21ksoftirqd/311:50:003
353383299224,2cyclictest141rcu_preempt10:28:023
353383299222,2cyclictest141rcu_preempt08:05:003
3533832992220,1cyclictest3056-21PK-Backend11:25:103
3533832992220,1cyclictest0-21swapper/308:15:373
3533832992220,1cyclictest0-21swapper/307:14:523
3533832992211,4cyclictest42-21ksoftirqd/312:15:253
3533832992211,4cyclictest42-21ksoftirqd/311:53:473
3533832992210,4cyclictest42-21ksoftirqd/311:13:223
3533832992210,4cyclictest42-21ksoftirqd/309:50:323
353383099228,4cyclictest34-21ksoftirqd/209:30:002
353383099223,17cyclictest436-20systemd-journal08:35:002
3533827992220,1cyclictest3056-21PK-Backend08:52:171
3533827992220,1cyclictest0-21swapper/111:57:111
3533827992220,1cyclictest0-21swapper/111:23:581
3533827992220,1cyclictest0-21swapper/110:00:161
3533827992213,7cyclictest3642697-21ntp_states12:15:221
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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