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2019-07-16 - 02:48

Intel(R) Xeon(R) CPU X5650 @ 2.67GHz, Linux 4.19.37-rt19 (Profile)

Latency plot of system in rack #c, slot #8
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 -Sp99 -i200 -h400 -q --smi
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
The worst-case latency is about 1.11 times higher under extreme CPU load.
Results of all systems under extreme CPU load are combined on this summary graph.
The worst-case latency is NOT higher under graphics load.
Results of all systems with accelerated graphics are combined on this summary graph.
Characteristics of the 20 highest latencies:
System rackcslot8.osadl.org (updated Mon Jul 15, 2019 00:51:58)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1405912000,0ptp4l0-21swapper/119:05:431
1011220,0ktimersoftd/00-21swapper/019:07:430
144991115106,0phc2sys0-21swapper/219:05:084
10411110,0ktimersoftd/1123274-21expr19:05:043
5511060,0rcuc/50-21swapper/519:05:137
7911030,0rcuc/80-21swapper/819:05:0310
7111030,0rcuc/70-21swapper/719:05:029
8711010,0rcuc/90-21swapper/919:05:1511
951980,0rcuc/100-21swapper/1019:05:022
471840,0rcuc/40-21swapper/419:05:136
391810,0rcuc/30-21swapper/319:09:485
2532827259,0sleep60-21swapper/619:08:278
631580,0rcuc/625988-21cut19:10:018
111560,0rcuc/00-21swapper/019:10:000
551550,0rcuc/525837-21sed19:10:007
791530,0rcuc/825774-21dirname19:10:0110
140591530,0ptp4l0-21swapper/119:10:011
871510,0rcuc/90-21swapper/919:10:0011
391510,0rcuc/326440-21munin-node19:10:015
311440,0rcuc/225835-21latency_hist19:10:004
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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