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2025-12-30 - 14:28
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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 rack9slot2.osadl.org (updated Tue Dec 30, 2025 00:43:26)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
32052269176,23sleep10-21swapper/11
32162257221,24sleep20-21swapper/22
31972257179,43sleep30-21swapper/33
30472252192,48sleep00-21swapper/00
1599721190,3sleep2349099cyclictest2
269752640,4sleep026980-21unixbench_singl0
162862560,2sleep216282-21perf2
222512500,2sleep30-21swapper/33
271512490,1sleep20-21swapper/22
52132460,3sleep30-21swapper/33
110302400,10sleep121-21ksoftirqd/11
348699390,37cyclictest23052-21kworker/1:11
349099350,33cyclictest8504-21kworker/2:12
3483993513,19cyclictest31474-21cron0
3483993413,18cyclictest4095-21cut0
3483993312,18cyclictest4892-21cat0
3483993311,19cyclictest14673-21awk0
348399328,21cyclictest517-21dbus-daemon0
3483993212,18cyclictest5407-21cat0
3483993211,18cyclictest32044-21sendmail-mta0
3483993211,18cyclictest10679-21sendmail-mta0
3483993210,19cyclictest15995-21sendmail-mta0
104952320,3sleep0348399cyclictest0
348399319,4cyclictest517-21dbus-daemon0
3483993111,17cyclictest517-21dbus-daemon0
3483993110,18cyclictest16944-21sendmail-mta0
348399309,19cyclictest517-21dbus-daemon0
348399308,4cyclictest517-21dbus-daemon0
348399308,3cyclictest20770-21aten2_r9power_v0
3483993014,14cyclictest7517-21/usr/sbin/munin0
3483993012,15cyclictest10017-21latency_hist0
3483993011,16cyclictest31783-21aten2_r9power_e0
3483993010,17cyclictest340-21systemd-journal0
3483993010,17cyclictest32145-21cat0
348399299,3cyclictest517-21dbus-daemon0
348399299,3cyclictest517-21dbus-daemon0
348399299,3cyclictest10884-21grep0
348399298,5cyclictest340-21systemd-journal0
348399298,4cyclictest340-21systemd-journal0
348399298,4cyclictest27972-21sendmail-mta0
348399297,4cyclictest517-21dbus-daemon0
348399297,4cyclictest340-21systemd-journal0
348399291,9cyclictest340-21systemd-journal0
348399291,10cyclictest340-21systemd-journal0
3483992910,17cyclictest30276-21latency_hist0
3483992910,16cyclictest18836-21ls0
348399289,3cyclictest17121-21cat0
348399289,3cyclictest14300-21ntpq0
348399289,3cyclictest12877-21sendmail-mta0
348399281,10cyclictest340-21systemd-journal0
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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