On 11/04/2009 09:16 AM, Chris Adams wrote:
Once upon a time, Cameron Simpson<cs@xxxxxxxxxx> said:
On 03Nov2009 23:45, Alan Cox<alan@xxxxxxxxxxxxxxxxxxx> wrote:
| Such as the kernel ... which is much happier in 64bit mode with over 1GB
| of RAM.
Is there some URL I could visit that qualifies this?
I'm not doubting you, but I would like to have a mental model of roughly
why and how 64-bit mode benefits a system.
If you have 1G (or really a little less) of physical RAM on 32-bit x86,
the kernel can map all of it into the kernel's virtual address space.
Otherwise, it has to use different addressing to access physical
addresses, IIRC mapping them on demand (which adds overhead).
On a 64-bit system, all of physical memory can be mapped into the kernel
address space at all times.
Also, x86_64 has a larger CPU register set, which can speed up some
operations.
So according to you .... one must go for 64bit if the hardware is
capable for it .... is it ????
--
°v°
/(_)\
^ ^ Jatin Khatri
No MS
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