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2026-05-21 - 06:02

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 Thu May 21, 2026 00:43:02)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3565323996048,8cyclictest261-21systemd-journal00:18:442
3565323996048,8cyclictest261-21systemd-journal00:18:442
3565323995745,8cyclictest1056-21mta-sts-daemon21:11:012
3565323995645,7cyclictest3663384-21unixbench_singl22:26:142
3565323995645,7cyclictest3663384-21unixbench_singl22:26:142
3565323995244,5cyclictest3685516-21/usr/sbin/munin22:55:012
3565323994938,5cyclictest0-21swapper/220:30:592
3565321994939,6cyclictest695-21cron19:35:000
3565323994737,7cyclictest3598387-21latency_hist21:00:022
3565321994733,7cyclictest12350irq/32-eth021:40:590
3565321994733,7cyclictest12350irq/32-eth021:40:590
3565323994637,5cyclictest0-21swapper/222:20:012
3565322994636,6cyclictest3609103-21basename21:20:011
3565323994535,7cyclictest1051-21mta-sts-daemon23:11:052
3565323994535,7cyclictest1051-21mta-sts-daemon23:11:052
3565323994535,6cyclictest1-21systemd22:25:022
3565323994535,6cyclictest1-21systemd22:25:022
3565323994438,3cyclictest0-21swapper/200:10:552
3565322994433,4cyclictest0-21swapper/121:41:031
3565322994433,4cyclictest0-21swapper/121:41:031
3565322994431,9cyclictest0-21swapper/122:10:011
3565321994426,15cyclictest3630200-21if_wlan021:45:510
3565321994426,15cyclictest3630200-21if_wlan021:45:510
3565322994334,6cyclictest3641251-21munin-run22:00:011
356532199433,30cyclictest3719310-21ssh23:36:000
3565323994232,6cyclictest3621215-21latency_hist21:35:022
356532299424,32cyclictest3678905-21ssh22:46:001
356532299422,35cyclictest3695063-21ssh23:05:591
356532199424,30cyclictest3650721-21ssh22:10:580
3565323994133,5cyclictest3717878-21ssh23:35:012
3565323994132,6cyclictest1744621-21cups-browsed22:06:042
3565322994130,8cyclictest3750187-21ssh00:15:011
3565321994134,4cyclictest421-21dbus-daemon22:35:010
3565323994032,5cyclictest3592347-21latency_hist20:40:022
3565323994032,4cyclictest3578816-21kworker/u8:5+xprtiod19:55:012
3565323994031,5cyclictest3713903-21latency_hist23:30:022
3565323994029,7cyclictest1744621-21cups-browsed22:45:242
3565323994026,3cyclictest171rcu_preempt00:00:002
3565322994034,3cyclictest0-21swapper/100:05:011
3565322994032,5cyclictest3725972-21ssh23:45:021
3565322994032,5cyclictest3598370-21systemd-run21:00:011
3565322994031,6cyclictest1-21systemd21:35:011
3565322994027,7cyclictest3690963-21sh23:00:581
3565321994032,5cyclictest3682163-21ssh22:50:450
3565321994023,11cyclictest3686955-21ssh22:55:590
3565323993932,4cyclictest1054-21mta-sts-daemon00:36:052
3565323993928,8cyclictest3633221-21sh21:50:012
3565323993928,8cyclictest3633221-21sh21:50:012
3565323993928,7cyclictest1056-21mta-sts-daemon21:57:062
3565322993931,5cyclictest1051-21mta-sts-daemon23:56:191
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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