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2025-07-10 - 18:20
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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 20 highest latencies:
System rack9slot2.osadl.org (updated Thu Jul 10, 2025 12:43:24)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2021599290284,4cyclictest542-21sendmail0
198732271203,36sleep00-21swapper/00
198952265190,42sleep20-21swapper/22
197042265186,44sleep30-21swapper/33
197932253191,35sleep10-21swapper/11
2022099195188,4cyclictest567-21systemctl1
2022599176171,3cyclictest0-21swapper/22
764221570,3sleep02021599cyclictest0
1010121410,1sleep02021599cyclictest0
202299910297,3cyclictest530-21munin-run3
213602500,4sleep32022999cyclictest3
2022999465,24cyclictest505-21dbus-daemon3
253682410,1sleep10-21swapper/11
146752410,1sleep20-21swapper/22
2022999400,22cyclictest23614-21apt-get3
2022999400,22cyclictest23614-21apt-get3
2022999390,22cyclictest17598-21awk3
2022999380,23cyclictest5033-21grep3
2022999380,21cyclictest2694-21latency_hist3
2022999380,21cyclictest25478-21diskstats3
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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