F 15. 64 bit versus 32 bit.

[Rahul Sundaram]

On 05/24/2011 08:57 PM, Bill Davidsen wrote:
> What? Are you saying that KVM support is out of the PAE 32bit kernel? Because 
> libvirt, virt-manager, etc, are definitely shown as available packages. As far 
> as limitations and performance go, unless you have applications which push the 
> 4GB memory limit of PAE, you will be essentially the same in either case, but 
> will have a harder time finding third party applications for 64 bit.

I was talking *only* about RHEL support but here are the details if you
want to know

http://www.redhat.com/rhel/server/virtualization_support.html

> I have a pair of systems, i7-950, 12GB RAM, 4x1TB RAID5, doing VM hosting. One 
> is fc13 i686, one is fc13 x86_64. There is no obvious performance difference, 
> the only benefit of x86_54 is that I can run a 64 bit guest for testing.

Benchmarking has shown conclusively that x86_64 has much better
performance for virtualization if you have over 4GB RAM for typical
workloads.  YMMV

Rahul