User question: does KVM work better with latest Linux kernel?

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Hello

I'm currently using Linux kernel 3.13.0 (Ubuntu Linux 14.04 with
latest updates). KVM works in general but I noticed a number of small
bugs. E.g. after suspending/resuming a system time is different on host
and guest systems (FreeBSD 10.2). Also when guest system consumes 100%
of its CPU, htop on host system shows that utilization is 100%, but in
guest system it shows only about 33%. Etc.

Is it worth trying to upgrade Linux kernel to say 4.5? Does an upgrade
usually solve some problems with KVM or more likely I will just waste my
time? So basically I'm asking what is considered rule of thumb here.

-- 
Best regards,
Aleksander Alekseev
http://eax.me/
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