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2026-04-11 - 02:59

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 Sat Apr 11, 2026 00:44:45)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
11408822229171,19sleep60-21swapper/619:05:286
11409702219183,23sleep40-21swapper/419:06:294
11387732217164,43sleep30-21swapper/319:05:083
11387682217164,42sleep70-21swapper/719:05:057
11410162211174,24sleep00-21swapper/019:07:060
11409872209180,18sleep10-21swapper/119:06:431
11409412208178,19sleep20-21swapper/219:06:042
11409622206173,21sleep50-21swapper/519:06:235
11831192620,0sleep40-21swapper/420:20:134
114145199260,25cyclictest1326995-21chrt00:30:103
114145699250,24cyclictest1332533-21turbostat.cron00:40:005
114145399250,23cyclictest1274806-21munin-run23:00:004
114144199250,24cyclictest0-21swapper/019:45:000
1141462992423,1cyclictest0-21swapper/723:35:127
1141462992422,1cyclictest1165866-21apt-get19:50:117
114145999240,23cyclictest1304120-21http23:50:116
1141456992421,2cyclictest1205474-21idleruntime-cro20:59:595
114145399240,23cyclictest0-21swapper/423:25:114
114145399240,23cyclictest0-21swapper/421:00:124
114144199240,0cyclictest0-21swapper/021:35:110
114146299236,4cyclictest0-21swapper/723:48:027
114146299236,4cyclictest0-21swapper/721:14:157
114146299236,4cyclictest0-21swapper/700:20:597
114146299230,22cyclictest0-21swapper/722:40:127
1141459992321,1cyclictest1208319-21awk21:05:006
114145999230,22cyclictest0-21swapper/600:25:126
114145999230,22cyclictest0-21swapper/600:04:596
1141456992321,1cyclictest1185871-21apt-get20:25:115
1141456992321,1cyclictest1151321-21apt-get19:25:125
114145699230,22cyclictest1272366-21apt-get22:55:115
114145399230,22cyclictest1330107-21apt-get00:35:114
1141451992321,1cyclictest0-21swapper/323:30:133
1141451992321,1cyclictest0-21swapper/320:45:113
1141451992320,2cyclictest1192836-21chrt20:35:163
114145199230,22cyclictest1208730-21apt-get21:05:123
114145199230,22cyclictest0-21swapper/320:25:123
114145199230,1cyclictest1171161-21perf20:00:003
114144799230,2cyclictest1309382-21cmp00:00:012
114144799230,0cyclictest0-21swapper/220:15:122
1141445992323,0cyclictest0-21swapper/100:35:121
1141445992321,2cyclictest1251438-21awk22:20:001
1141441992322,1cyclictest0-21swapper/023:00:120
1141441992321,1cyclictest1237558-21apt-get21:55:120
1141441992321,1cyclictest0-21swapper/021:44:590
114144199230,22cyclictest0-21swapper/020:45:100
114146299226,3cyclictest0-21swapper/700:10:007
1141462992222,0cyclictest0-21swapper/720:00:127
1141462992221,1cyclictest1208311-21munin-run21:05:007
114146299220,21cyclictest0-21swapper/721:50:127
114146299220,1cyclictest1144825-21apt-get19:15:017
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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