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2025-12-05 - 16:11

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #8, slot #4

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 rack8slot4s.osadl.org (updated Fri Dec 05, 2025 12:44:44)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
13825452243172,24sleep10-21swapper/107:09:411
13825282227190,24sleep40-21swapper/407:09:294
13823962223187,23sleep60-21swapper/607:07:376
13824082216183,21sleep00-21swapper/007:07:470
13823122216183,21sleep70-21swapper/707:06:267
13823822215169,16sleep30-21swapper/307:07:273
13825372212184,18sleep20-21swapper/207:09:342
13822452210177,21sleep50-21swapper/507:05:275
138280199260,25cyclictest1391377-21turbostat.cron07:35:006
1382779992622,1cyclictest2970800-21systemd-journal11:09:590
138280199250,2cyclictest1433200-21apt-get09:35:006
138279999250,24cyclictest1479475-21turbostat.cron10:55:005
138279599250,24cyclictest1513880-21turbostat11:54:594
138278199250,24cyclictest0-21swapper/107:40:011
1382804992423,1cyclictest0-21swapper/707:40:017
138280499240,24cyclictest0-21swapper/712:35:097
138279099240,23cyclictest1395039-21perf07:45:003
138279099240,1cyclictest1392168-21perf07:40:003
138278599240,1cyclictest1479903-21apt-get10:55:142
138278599240,1cyclictest1418380-21apt-get09:10:002
138277999240,3cyclictest1490920-21munin-plugin-st11:14:590
14192532230,1sleep351-21ksoftirqd/309:10:103
138280499230,23cyclictest0-21swapper/710:25:017
1382801992321,1cyclictest1395789-21perf07:50:016
138280199230,22cyclictest1494266-21apt-get11:20:116
138280199230,22cyclictest1482340-21munin-run10:59:596
138279999230,22cyclictest1416875-21cut09:00:005
138279999230,22cyclictest0-21swapper/511:25:115
1382795992322,1cyclictest1439198-21munin-run09:45:004
1382795992321,1cyclictest1465605-21apt-get10:30:134
1382795992321,1cyclictest0-21swapper/409:15:104
1382795992319,3cyclictest1392602-21http07:40:114
138279599230,22cyclictest0-21swapper/412:30:024
1382790992321,1cyclictest1412517-21munin-run08:45:003
138279099230,22cyclictest0-21swapper/311:10:103
138279099230,1cyclictest0-21swapper/311:49:593
1382785992321,2cyclictest1470902-21perf10:40:002
138278599230,22cyclictest1447759-21munin-run10:00:002
138278599230,22cyclictest0-21swapper/211:05:132
1382781992321,1cyclictest1392599-21apt-get07:40:121
138278199230,22cyclictest1511036-21perf11:50:001
138278199230,22cyclictest1490907-21idleruntime-cro11:14:591
138278199230,22cyclictest0-21swapper/111:55:121
1382779992319,3cyclictest1459204-21perf10:20:000
138277999230,22cyclictest0-21swapper/012:00:090
138277999230,22cyclictest0-21swapper/010:00:150
138280499220,21cyclictest0-21swapper/709:15:117
138280499220,21cyclictest0-21swapper/707:40:117
1382801992219,2cyclictest1528218-21idleruntime-cro12:19:596
138280199220,21cyclictest0-21swapper/611:35:096
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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