Hi Roberto,
On 6 December 2016 at 19:01, Roberto Fichera <kernel@xxxxxxxxxxxxx> wrote:
> I've set to copy host configuration (16 cores) and memory is set to 24GB, host has 64GB.
> Guest is Windows 2012 64bits version
Is the guest configured with 16 cpus or 16 cores?
>> Are you pinning to dedicated CPUs,
>
>no
I would, to ensure cpu or cache performance is absolutely not a
problem, and it's simple to do (see vcpupin).
>> are you exposing host topology and cpu
>> features,
>
> Yes
So you have something like:
<cpu mode='host-passthrough'>
<topology sockets='1' cores='8' threads='2'/>
In your domain xml?
>> do you have dedicated I/O threads?
>
> if you are talking about disk I/O, no. Should I do that?
Hard to say what the problem is without a lot more information - maybe
the system in question is performance limited by the DB design...
But if you are bottlenecking on I/O in the guest whilst the host seems
to have more I/O available then you probably want to consider tuning
this:
https://libvirt.org/formatdomain.html#elementsIOThreadsAllocation
>> Are you backing the guest memory with hugepages?
>
> Don't know, how can I check or set it?
You can either use transparent huge pages (assuming you are not doing
any PCI passthrough), or create a static hugepage allocation for
guests. Search for documentation specific to your OS.
--
Cheers,
~Blairo
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