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2026-05-18 - 13:50

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 here to display the system's profile data or here to proceed to next system.
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 20 highest latencies:
System rack2slot7s.osadl.org (updated Mon May 18, 2026 12:43:03)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2726146995242,6cyclictest2757634-21systemd-run08:55:012
2726145995243,6cyclictest2726149-21systemd-run07:10:011
2726145994941,4cyclictest0-21swapper/111:20:011
2726144994923,18cyclictest12350irq/32-eth011:00:580
2726144994923,18cyclictest12350irq/32-eth011:00:580
2726146994739,3cyclictest0-21swapper/210:30:562
2726145994737,6cyclictest1883891-21cups-browsed11:12:571
2726145994724,17cyclictest2782030-21cron09:35:001
2726145994724,17cyclictest2782030-21cron09:35:001
272614499473,37cyclictest2771614-21ssh09:21:000
2726144994638,5cyclictest2923813-21fschecks_time12:30:470
2726144994638,5cyclictest2923813-21fschecks_time12:30:470
2726145994537,5cyclictest421-21dbus-daemon10:30:011
2726145994525,16cyclictest2735132-21basename07:40:011
272614599452,28cyclictest2848019-21ntp_states10:56:021
2726144994534,8cyclictest2750124-21ls08:30:010
2726146994425,16cyclictest2914830-21cut12:20:012
2726145994435,5cyclictest2846556-21munin-plugin-st10:55:011
2726145994429,12cyclictest0-21swapper/110:00:011
272614499447,31cyclictest2762126-21diskmemload09:40:530
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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