Re: [Xen-users] Assign multiple cpu's to a single vcpu

[Nico Kadel-Garcia <nkadel@xxxxxxxxx>]

Shem Valentine wrote:
> Hello list,
>
> This is my first attempt at running Xen, and so far it has been
> incredible.  However, I don't think it's going to work for the specific
> application I was trying to use it for.
>
> We have a web management system which uses a MySQL backend.  We have put
> the MySQL server on a dual cpu motherboard with 2 dual-core XEON's with
> hyperthreading.  I noticed that MySQL would only run on one core with a
> total CPU usage of 25% (due to performance issues I had disabled
> hyperthreading).  While searching forums and such about MySQL threading
> a few people had mentioned going VMWARE because MySQL did not support
> threading natively.  However I am a big fan open source and I like that
> Xen was not a userspace virtualization so I gave it a try.
>
> I've been running into the same problem with Xen.  I cannot get it to
> use more than one core with MySQL.  What I am looking to do is have the
> DomU have one vcpu and have Xen thread it's vcpu across all 8 physical
> cpus.  I am naive in thinking this is possible with any virtualization?
>
> When doing my research the User Manual seems to say that this is possible:
> " Xen allows a domain's virtual CPU(s) to be associated with one or more
> host CPUs. This can be used to allocate real resources among one or more
> guests, or to make optimal use of processor resources when utilizing
> dual-core, hyperthreading, or other advanced CPU technologies."
>   
Which version of Xen? And what do your guest domain configurtions look 
like?There are certainly options in the config files to enable this.
And what does /proc/cpuinfo say on your Dom0?

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