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2026-08-04 - 13:12

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, 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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  Intel
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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: ondemand
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack5slot4s.osadl.org (updated Tue Aug 04, 2026 00:44:13)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
49436021980,3sleep3575-21kworker/3:2+events21:23:003
6768962920,2sleep3481ktimers/300:27:573
5762342650,5sleep30-21swapper/322:43:083
6138092590,2sleep2371rcuc/223:22:592
4177772590,5chrt0-21swapper/020:05:010
360415995549,4cyclictest3166996-21kworker/u8:1+events_unbound19:30:001
360415995549,4cyclictest3166996-21kworker/u8:1+events_unbound19:30:001
360415994943,5cyclictest487256-21kworker/u8:2+events_unbound21:28:101
360415994943,4cyclictest539908-21kworker/u8:3+events_unbound22:15:001
360415994943,4cyclictest3166996-21kworker/u8:1+events_unbound19:18:091
360415994940,6cyclictest397831-21latency_hist19:45:021
360412994940,6cyclictest377730-21base6419:25:000
360415994843,3cyclictest482087-21kworker/u8:3+events_unbound21:18:071
360415994841,5cyclictest457136-21kworker/u8:1+flush-8:021:07:531
360415994740,5cyclictest487256-21kworker/u8:2+flush-8:022:28:061
360412994721,23cyclictest487029-21latency_hist21:15:010
360415994640,4cyclictest539908-21kworker/u8:3+events_unbound23:08:051
360412994319,20cyclictest556589-21latency_hist22:25:000
360415994236,4cyclictest422786-21kworker/u8:3+events_unbound20:43:051
360415994235,5cyclictest487256-21kworker/u8:2+flush-8:021:57:551
360412994235,5cyclictest377579-21apt-get19:25:020
360412994235,5cyclictest377579-21apt-get19:25:020
360412994227,13cyclictest616353-21latency_hist23:25:000
360415994135,4cyclictest412664-21kworker/u8:2+flush-8:020:58:051
360415994134,6cyclictest600995-21kworker/u8:0+flush-8:023:22:581
360415994133,6cyclictest432431-21latency_hist20:20:011
360412994133,5cyclictest536783-21latency_hist22:05:010
360412994126,13cyclictest275-21systemd-journal00:30:000
360412994122,17cyclictest676049-21latency_hist00:25:000
360415994035,4cyclictest621639-21kworker/u8:3+flush-8:023:48:051
360415994034,4cyclictest457136-21kworker/u8:1+flush-8:021:13:101
360415993934,4cyclictest539908-21kworker/u8:3+events_unbound22:38:101
360412993924,13cyclictest590605-21ntpq22:58:070
360412993922,13cyclictest0-21swapper/020:13:050
360412993921,16cyclictest438112-21fschecks_count20:27:560
360412993921,16cyclictest438112-21fschecks_count20:27:550
360415993833,4cyclictest457136-21kworker/u8:1+events_unbound20:53:031
360415993833,3cyclictest482087-21kworker/u8:3+events_unbound21:48:091
360415993832,5cyclictest539908-21kworker/u8:3+flush-8:022:58:031
360415993832,4cyclictest482087-21kworker/u8:3+flush-8:021:43:031
360412993822,14cyclictest497881-21fschecks_count21:27:550
360416993728,7cyclictest626319-21apt-get23:35:002
360415993733,3cyclictest571719-21kworker/u8:2+flush-8:023:27:541
360415993731,5cyclictest571719-21kworker/u8:2+flush-8:022:48:081
360415993729,6cyclictest462079-21latency_hist20:50:011
36041299373,25cyclictest0-21swapper/021:02:500
360412993731,4cyclictest401-21dbus-daemon23:15:000
360412993719,16cyclictest482054-21cron21:10:000
360412993715,19cyclictest407694-21latency_hist19:55:010
360415993631,4cyclictest539908-21kworker/u8:3+events_unbound22:33:061
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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