Re: Windows guest CPU socket/core recognition

[Zdenek Kaspar <zkaspar82@gmail.com>]

Brian Jackson napsal(a):
> On Monday 17 August 2009 22:28:35 Zdenek Kaspar wrote:
>> Hello everyone,
>>
>> I guess I'm not the first one who hit the problem with Microsoft's
>> licensing model..
>>
>> Nowadays the common single or dual quad-core workstation can't be fully
>> used because it's limited by example: license up to 2 physical
>> processors. Such VM acts like 4-way or 8-way machine.
> 
> 
> Nine times out of ten, a single cpu guest is going to be a better option than 
> a smp/multie core guest. I've seen idle windows guests go from using nearly 
> 200% cpu for -smp 2 to ~5-10% for -smp 1. Unless your guest is actually using 
> all that cpu all the time, you're going to be wasting a decent amount of 
> cycles.

Yes, without proper use it's waste. My guest is 64bit and represents
node in computing cluster working on assigned jobs (not MPI etc..)

>> Is there any way howto expose CPUs differently for this kind of problem?
> 
> 
> There have been patches (from Andre Pryzwara and maybe others) to support 
> multi-core vs mult-socket smp.

I will check these patches, thank you (and Dor Laor) for the hint!