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2026-05-21 - 13:35

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 Thu May 21, 2026 12:43:02)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
354175995143,5cyclictest540558-21grep12:20:012
354174995041,5cyclictest449020-21grep10:25:011
354174995041,5cyclictest449020-21grep10:25:011
354174995040,7cyclictest357159-21munin-run07:20:011
354174994824,5cyclictest171rcu_preempt12:06:001
354174994739,5cyclictest444970-21grep10:20:011
354174994637,6cyclictest382682-21systemd-run08:45:021
354174994635,8cyclictest1-21systemd10:15:011
354173994636,8cyclictest1-21systemd11:35:010
354175994436,5cyclictest476979-21idleruntime-cro11:00:012
354173994424,17cyclictest659-21snmpd07:30:590
354175994335,5cyclictest1-21systemd12:25:022
354175994334,6cyclictest421-21dbus-daemon09:35:012
354173994326,14cyclictest12350irq/32-eth010:25:540
354173994326,14cyclictest12350irq/32-eth010:25:540
35417399432,31cyclictest391529-21ssh09:10:590
354175994234,5cyclictest372148-21cron08:10:002
354174994233,5cyclictest406556-21sshd09:31:081
354174994222,4cyclictest171rcu_preempt08:26:021
354175994131,7cyclictest508666-21munin-plugin-st11:40:012
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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