Fedora 9 32 or 64 Bit - Which One?

[stan]

Matthew Flaschen wrote:
> stan wrote:
>> Alan Cox wrote:
>>> On Mon, 27 Oct 2008 11:54:47 -0400
>>> Matthew Flaschen <matthew.flaschen at gatech.edu> wrote:
>>>
>>>> Alan Cox wrote:
>>>>
>>>>> The moment you have more than about 900MB of RAM there are big
>>>>> advantages
>>>>> to running a 64bit kernel as it can keep all of physical and virtual
>>>>> space mapped at the same time, which is a big performance win.
>>>>>
>>>>> Alan
>> Wouldn't you need twice as much memory to have the same memory for
>> applications if you are using double the word size?
> 
> This is incorrect in general.  GNU/Linux 32-bit uses ILP32, meaning
> integers, longs, and pointers all have 32 bits.  GNU/Linux 64 uses LP64,
> which means longs and pointers have 64 bits.  Integers remain 32 bits,
> and ASCII chars are still 8 bits (this is true of ILP64, another model,
> as well).  Please read http://www.unix.org/whitepapers/64bit.html.
> 
Thank you for the response and the link.