Virtualbx and CPU counting

[Schaich, Alonso]

On Mon, 2 Feb 2015 22:09:04 +1100 (EST)
Peter Ross <Peter.Ross at alumni.tu-berlin.de> wrote:

> Hi,
> 
> I have a question:
> 
> I have a server with
> 
> - 2 Xeon E5-2609,
> - 4 cores each
> - 4 threads per core
> 
> On OS level, Linux and FreeBSD see 8 processors.
> 
> VirtualBox offers 16 CPUs as the maximal number for a VM.
> 
> I expected 32. How does this work?
> 
> Regards
> Peter

Hi,

The Xeon E5-2609 has 1 Thread per core, resulting in 4 Threads per
Socket and 8 Threads in a dual-socket setup.

If it had Hyperthreading (like the 2620 and "greater" models do), then
it would have 2 Threads per core, i.e. 16 on a dual setup with 4 cores
per socket.

Alonso
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