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Incorrect data(CPU utilization) for KVM and Host in CentOS 7 #29

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MyungChi opened this issue Nov 1, 2018 · 0 comments

MyungChi commented Nov 1, 2018

I test with Host sFlow as below environment.

Host OS : CentOS 7.3 with KVM (4 core)
Guest OS : CentOS 7.3 ( 2 vcore )
hsflowd-2.0.15-1.x86_64 is installed in Host OS

I generate overhead with stress tool. (yum install stress)

Guest OS CPU is shown 50% with top.
Host OS CPU is shown 25% with top.

I checked with sflowtool collected counter information from hsflowd.

In case of Host OS
cpu_load_one 1.320
cpu_load_five 1.330
cpu_load_fifteen 1.090

In case of Guest OS
delta of CPU time(30 sec) = 1060630 - 1095300 = 69340
69340 / 30000 = 2.315

Is this collect ? I can't sure is it right way to get CPU utilization.

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