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2026-06-05 - 01:20

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, 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.

Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rackeslot4s.osadl.org (updated Thu Jun 04, 2026 12:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3908360994742,4cyclictest4131762-21latency_hist10:45:012
3908360993935,3cyclictest3949731-21kworker/u8:1+flush-259:008:55:142
3908363993732,3cyclictest4027793-21kworker/u8:4+flush-259:010:50:163
3908360993733,2cyclictest15754-21kworker/u8:2+flush-259:012:35:182
3908360993732,3cyclictest3954901-21/usr/sbin/munin07:55:232
3908356993731,4cyclictest4038316-21/usr/sbin/munin09:15:211
3908360993226,4cyclictest3939220-21latency_hist07:40:002
3908352993227,3cyclictest3929185-21apt-get07:30:110
3908363993123,7cyclictest4054024-21kworker/u8:0+flush-259:009:40:003
3908360993126,4cyclictest4064284-21latency_hist09:40:002
3908360993026,3cyclictest4027793-21kworker/u8:4+flush-259:011:45:242
3908360993025,3cyclictest4137558-21/usr/sbin/munin10:50:142
3908352993025,3cyclictest4100809-21apt-get10:15:100
3908360992925,3cyclictest3899200-21kworker/u8:3+flush-259:007:14:592
3908352992925,3cyclictest3913673-21kworker/u8:4+flush-259:008:15:000
3908352992823,3cyclictest20882-21gpgv12:05:000
3908352992822,4cyclictest57352-21latency_hist12:40:000
3908363992721,5cyclictest4147667-21latency_hist11:00:013
3908352992720,4cyclictest4038072-21latency_hist09:15:010
3908363992620,4cyclictest335557-21systemd-journal07:34:283
3908360992622,3cyclictest3850052-21kworker/u8:1+flush-259:007:20:002
3908360992621,4cyclictest3970745-21cat08:10:012
3908352992622,3cyclictest15754-21kworker/u8:2+flush-259:012:20:000
3908352992621,4cyclictest4162331-21kworker/u8:2+flush-259:011:15:230
3908360992522,2cyclictest4001952-21kworker/u8:0+flush-259:009:00:152
3908360992521,3cyclictest3933849-21kworker/u8:2+flush-259:008:00:262
3908356992521,3cyclictest10862-21apt-get11:55:111
3908352992521,3cyclictest3939487-21apt-get07:40:130
3908352992513,10cyclictest0-21swapper/010:45:010
3908363992421,2cyclictest4137550-21kworker/u8:1+flush-259:011:00:153
3908356992421,2cyclictest4059407-21apt-get09:35:111
3908352992419,3cyclictest4026912-21ntpq09:00:200
3908352992418,4cyclictest4022582-21latency_hist09:00:000
3908363992320,2cyclictest4002168-21kworker/u8:3+events_unbound09:40:123
3908363992317,4cyclictest4002361-21diskstats08:40:133
3908360992317,4cyclictest4151949-21ntpq11:00:192
3908356992319,3cyclictest4126537-21latency_hist10:40:011
3908356992319,3cyclictest4002168-21kworker/u8:3+flush-259:009:10:151
3908356992319,3cyclictest335557-21systemd-journal09:25:011
3908363992219,2cyclictest4027793-21kworker/u8:4+flush-259:010:40:003
3908363992219,2cyclictest4027793-21kworker/u8:4+flush-259:009:15:013
3908363992219,2cyclictest4002168-21kworker/u8:3+flush-259:008:45:203
3908363992218,3cyclictest335557-21systemd-journal07:13:273
3908363992216,4cyclictest3975961-21/usr/sbin/munin08:15:133
3908360992219,2cyclictest4162331-21kworker/u8:2+flush-259:011:35:152
390835699221,20cyclictest1-21systemd12:35:011
390835299226,15cyclictest4178696-21idleruntime-cro11:30:000
3908352992215,5cyclictest4074665-21latency_hist09:50:000
3908363992115,4cyclictest335557-21systemd-journal12:25:003
3908360992118,2cyclictest4002168-21kworker/u8:3+events_unbound09:10:162
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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