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2026-05-31 - 02:13

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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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 rackcslot7s.osadl.org (updated Sat May 30, 2026 12:44:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
139099810,70rtkit-daemon0-21swapper/007:05:080
348206027643,26sleep30-21swapper/307:06:293
34848882750,2sleep00-21swapper/007:15:110
348223227050,15sleep20-21swapper/207:08:412
348215726140,14sleep10-21swapper/107:07:421
34856022600,2sleep30-21swapper/307:15:183
35546462590,3sleep00-21swapper/010:30:190
139099380,3rtkit-daemon0-21swapper/212:33:352
139099380,3rtkit-daemon0-21swapper/211:27:462
139099380,3rtkit-daemon0-21swapper/211:17:072
139099380,3rtkit-daemon0-21swapper/209:57:512
139099370,3rtkit-daemon0-21swapper/211:21:272
139099370,3rtkit-daemon0-21swapper/210:54:052
139099370,3rtkit-daemon0-21swapper/210:54:042
139099370,3rtkit-daemon0-21swapper/210:42:182
139099370,3rtkit-daemon0-21swapper/209:48:052
139099360,3rtkit-daemon0-21swapper/212:20:452
139099360,3rtkit-daemon0-21swapper/212:12:512
139099360,3rtkit-daemon0-21swapper/211:36:152
139099350,2rtkit-daemon0-21swapper/209:22:342
348246799259,14cyclictest3571053-21sed11:20:013
3482465992515,7cyclictest3583359-21cron11:55:002
35523422240,3sleep20-21swapper/210:25:172
35470402240,2sleep1251rcuc/110:10:151
348246799246,16cyclictest3576474-21cut11:35:003
348246799240,22cyclictest3541930-21/usr/sbin/munin09:55:183
348246199242,19cyclictest3519583-21taskset08:54:541
348246199242,19cyclictest3519583-21taskset08:54:541
3482461992414,8cyclictest883-21dbus-daemon10:25:001
35860192230,10sleep342-21ksoftirqd/312:00:173
3482467992310,11cyclictest3505510-21unin-run08:15:003
3482465992320,2cyclictest0-21swapper/209:52:162
348246199231,3cyclictest3554173-21memory10:30:151
348246199230,21cyclictest3581519-21chrt11:48:351
3482467992220,1cyclictest0-21swapper/309:49:303
3482467992216,5cyclictest2085813-21snapd11:01:143
348246799220,21cyclictest0-21swapper/309:10:373
3482465992220,1cyclictest0-21swapper/209:01:272
3482465992220,1cyclictest0-21swapper/208:46:462
3482465992217,3cyclictest3532001-20cron09:30:012
3482465992212,7cyclictest436-20systemd-journal09:10:002
348246199223,4cyclictest26-21ksoftirqd/107:15:021
3482461992220,1cyclictest0-21swapper/111:26:391
3482461992220,1cyclictest0-21swapper/110:05:351
3482461992219,2cyclictest3056-21PK-Backend10:45:151
3482461992216,3cyclictest3530012-21sh09:25:001
35856342210,3sleep20-21swapper/212:00:112
35092382210,4sleep00-21swapper/008:25:010
35045422210,3chrt3056-21PK-Backend08:10:160
348246799211,9cyclictest3492741-21/usr/sbin/munin07:35:203
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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