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2026-08-20 - 08:52

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.
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 rack2slot7s.osadl.org (updated Wed Aug 19, 2026 12:42:58)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
372429995547,4cyclictest0-21swapper/110:00:011
372430995442,8cyclictest445084-21ssh10:10:012
372430995442,8cyclictest445084-21ssh10:10:012
37242999525,35cyclictest958-21sendmail-mta11:30:591
372428994840,5cyclictest421-21dbus-daemon10:15:010
372428994840,5cyclictest421-21dbus-daemon10:15:010
372430994639,3cyclictest0-21swapper/211:05:572
37242999462,35cyclictest425021-21ssh09:36:061
372429994537,5cyclictest431614-21grep09:46:121
372429994535,7cyclictest499966-21sh11:40:011
372428994537,5cyclictest393453-21systemd-run08:20:020
372428994535,7cyclictest499937-21idleruntime-cro11:40:010
372430994435,6cyclictest421-21dbus-daemon09:10:012
372428994437,4cyclictest12650irq/32-eth010:36:030
372428994434,3cyclictest0-21swapper/011:50:020
372430994335,5cyclictest530407-21basename12:30:002
372430994335,5cyclictest521253-21cron12:15:012
372430994333,6cyclictest486037-21proc_pri11:16:072
372430994317,19cyclictest421-21dbus-daemon09:36:032
372429994336,4cyclictest466409-21ssh10:45:011
372429994334,5cyclictest416376-21unixbench_singl09:21:111
372430994235,4cyclictest524313-21systemctl12:20:002
372430994235,4cyclictest524313-21systemctl12:20:002
372429994233,5cyclictest476918-21proc_pri11:01:081
372429994232,5cyclictest0-21swapper/112:21:021
372428994235,4cyclictest1-21systemd10:30:010
372430994121,3cyclictest171rcu_preempt07:16:042
372429994135,3cyclictest0-21swapper/109:10:011
372429994134,4cyclictest451161-21ssh10:20:001
372429994133,5cyclictest503025-21ssh11:45:021
372429994133,4cyclictest448143-21kworker/u8:10-xprtiod12:20:001
372429994133,4cyclictest448143-21kworker/u8:10-xprtiod12:20:001
372429994132,5cyclictest513874-21unixbench_multi12:01:131
372429994131,4cyclictest0-21swapper/110:09:491
372429994131,4cyclictest0-21swapper/110:09:491
372428994133,5cyclictest509860-21fschecks_time11:55:540
372430994029,7cyclictest420-21avahi-daemon09:54:592
372429994032,5cyclictest480367-21unixbench_singl11:06:121
372428994029,8cyclictest524301-21latency_hist12:20:020
372430993930,5cyclictest0-21swapper/209:26:002
372429993930,6cyclictest399396-21cron08:40:011
372429993930,4cyclictest0-21swapper/109:31:011
372429993928,9cyclictest414593-21sh09:20:011
372429993927,8cyclictest0-21swapper/109:41:001
372428993933,4cyclictest533574-21latency_hist12:35:020
37242899393,32cyclictest470589-21ssh10:50:560
372428993929,2cyclictest0-21swapper/009:00:000
372430993830,5cyclictest475536-21sh11:00:012
372430993830,5cyclictest391930-21systemd-run08:15:022
372430993829,6cyclictest429987-21latency_hist09:45:022
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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