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2026-01-07 - 10:30

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #2, 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.

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 792 highest latencies:
System rack2slot7s.osadl.org (updated Tue Jan 06, 2026 19:55:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1083161997462,8cyclictest1389683-21execl17:49:590
1083163996654,7cyclictest1889145-21sh18:10:052
1083161996655,7cyclictest1888639-21grep18:10:030
1083162995942,13cyclictest564-21dbus-daemon17:35:011
1083162995748,6cyclictest1845909-21sh18:08:181
1083162995747,6cyclictest1085999-21/usr/sbin/munin17:15:011
1083163995547,5cyclictest1352181-21sh17:42:032
1083162995244,5cyclictest1968973-21cut18:35:001
1083163995140,7cyclictest1391117-21execl17:50:082
1083162995143,5cyclictest1357337-21sh17:42:151
1083163995043,4cyclictest1903833-21multi.sh18:10:392
1083162995042,5cyclictest1924519-21sh18:11:281
1083161995030,17cyclictest1950190-21sh18:12:290
1083161994938,8cyclictest151ktimers/017:29:540
1083161994837,8cyclictest1326966-21sh17:40:590
1083161994732,12cyclictest1086386-21unixbench_singl17:15:030
1083161994713,27cyclictest1215594-21spawn17:34:580
1083162994638,5cyclictest1308063-21multi.sh17:40:011
1083161994628,14cyclictest1392781-21fstime17:57:450
1083163994536,6cyclictest0-21swapper/218:40:012
1083163994534,8cyclictest1086008-21munin-run17:15:012
1083163994436,5cyclictest1394544-21Run18:01:312
1083163994436,5cyclictest1394544-21Run18:01:312
108316199440,29cyclictest1293582-21multi.sh17:38:540
1083163994335,5cyclictest1964645-21idleruntime-cro18:20:012
1083163994334,6cyclictest1083072-21latency_hist17:05:012
1083162994333,7cyclictest3963859-21cups-browsed17:50:071
1083162994236,3cyclictest0-21swapper/117:49:561
1083163994135,2cyclictest0-21swapper/217:40:022
1083163994132,5cyclictest1389682-21execl17:49:562
1083162994133,5cyclictest1964888-21unixbench-2d18:20:021
1083161994119,19cyclictest1391152-21execl17:50:520
108316199411,37cyclictest1968709-21ntpq18:34:520
1083161994015,22cyclictest1497364-21spawn18:03:120
1083161994015,22cyclictest1497364-21spawn18:03:120
108316199401,36cyclictest1965824-21ntpq18:24:530
108316199401,36cyclictest1965824-21ntpq18:24:530
1083163993928,7cyclictest1969016-21switchtime18:35:002
1083161993933,4cyclictest1083290-21unixbench_multi17:05:010
108316199382,31cyclictest1964319-21ntpq18:19:520
108316199382,31cyclictest1087417-21ntpq17:19:540
1083163993727,7cyclictest1967562-21switchtime18:30:012
108316399372,6cyclictest171rcu_preempt17:24:522
1083162993729,5cyclictest1087763-21cron17:20:011
108316199371,33cyclictest1969515-21vmstat18:35:030
108316199371,33cyclictest1967005-21if_wlan018:29:480
1083161993711,23cyclictest0-21swapper/017:09:510
1083162993631,2cyclictest0-21swapper/117:05:011
1083162993627,6cyclictest1609065-21spawn18:03:401
1083162993627,6cyclictest1609065-21spawn18:03:401
1083162993627,6cyclictest1084902-21unixbench_multi17:10:021
1083162993527,5cyclictest1970465-21munin-run18:40:011
1083162993525,6cyclictest563-21avahi-daemon18:24:461
1083162993525,6cyclictest563-21avahi-daemon18:24:461
108316199341,30cyclictest1088211-21execl17:20:170
1083163993319,7cyclictest1215594-21spawn17:34:532
1083163993223,7cyclictest812-21cron17:20:012
1083162993223,7cyclictest1090832-21latency_hist17:30:021
1083163993124,4cyclictest1393184-21pipe17:59:482
1083163993123,6cyclictest1966052-21munin-run18:25:002
1083163993123,6cyclictest1966052-21munin-run18:25:002
1083163993123,5cyclictest1090274-21latency17:29:502
1083162993125,3cyclictest0-21swapper/117:59:471
1083163993024,3cyclictest0-21swapper/217:10:012
1083162993021,6cyclictest1088734-21latency17:24:491
1083162992819,6cyclictest1966936-21fschecks_time18:29:471
108316499163,6cyclictest0-21swapper/317:39:513
108316499161,9cyclictest0-21swapper/318:09:573
108316499161,9cyclictest0-21swapper/317:52:473
108316499161,8cyclictest0-21swapper/317:49:533
108316499153,7cyclictest0-21swapper/317:57:023
108316499153,4cyclictest0-21swapper/318:29:543
108316499152,7cyclictest0-21swapper/318:04:563
108316499152,7cyclictest0-21swapper/318:04:563
108316499151,8cyclictest0-21swapper/317:42:253
108316499151,6cyclictest0-21swapper/318:39:543
108316499151,6cyclictest0-21swapper/318:24:533
108316499151,6cyclictest0-21swapper/318:24:533
108316499141,6cyclictest0-21swapper/317:29:543
108316499131,7cyclictest0-21swapper/317:34:533
108316499131,6cyclictest0-21swapper/318:19:533
108316499131,6cyclictest0-21swapper/317:15:013
108316499122,6cyclictest0-21swapper/317:10:013
108316499121,6cyclictest0-21swapper/318:35:013
108316499112,7cyclictest0-21swapper/318:10:083
108316499111,6cyclictest0-21swapper/317:19:483
108316499102,4cyclictest0-21swapper/317:24:473
108316499102,4cyclictest0-21swapper/317:05:013
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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