64-bit Kernel Question

[Matej Cepl]

On 2009-03-09, 17:00 GMT, Adam Williamson wrote:
> Running x86-64 basically uses twice as much RAM for any given 
> workload as running x86-32 would.

Sorry, but that's just not true -- the only data types which are 
twice as big on x86_64 than on i386 are pointers and (I believe) 
long int. Every other primitive C type else remains the same in 
size. There was a long discussion of this on fedora-devel (I 
believe) couple of weeks ago.

Matěj