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2022-10-04 - 09:20

x86 Intel Atom E3845 @1910 MHz, Linux 4.19.37-rt19 (Profile)

Latency plot of system in rack #d, slot #3
Data to construct the above plot have been generated using the RT test utility cyclictest.
Unexpectedly long latencies may be caused by SMIs
Command line: cyclictest -l100000000 -m -Up99 -i200 -h400 --smi -q
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Characteristics of the 20 highest latencies:
System rackdslot3.osadl.org (updated Tue Oct 04, 2022 00:46:19)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
248721850,7sleep11022299cyclictest23:27:271
2139921460,4sleep11022299cyclictest23:00:131
8255911390,46ptp4l41-21ksoftirqd/319:05:433
96672827,20sleep10-21swapper/119:07:261
98882700,3sleep10-21swapper/123:45:011
97132624,45sleep20-21swapper/219:08:022
150042580,2sleep30-21swapper/319:20:003
258002540,2sleep30-21swapper/319:40:403
57698530,10rtkit-daemon0-21swapper/022:32:170
325782530,2sleep30-21swapper/322:15:203
10224994825,20cyclictest41-21ksoftirqd/322:11:013
825591460,1ptp4l401ktimersoftd/319:10:033
10224994628,7cyclictest41-21ksoftirqd/320:15:283
975324516,19sleep00-21swapper/019:08:340
10224994520,5cyclictest41-21ksoftirqd/321:12:133
1022399452,3cyclictest121rcu_preempt20:15:292
825591440,1ptp4l401ktimersoftd/320:27:103
825591440,1ptp4l401ktimersoftd/319:23:563
825591430,1ptp4l401ktimersoftd/322:07:183
825591430,1ptp4l401ktimersoftd/321:55:193
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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