x86_64 mail servers

goemon at anime.net goemon at anime.net
Wed Feb 8 19:46:47 GMT 2006

On Wed, 8 Feb 2006, Matt Kettler wrote:
> Mark Nienberg wrote:
>> I've seen comments on this list that the x86_64 didn't seem to make much
>> difference and I admit it is simpler to use the plain x86 version, but
>> it bothers me a little to intentionally not use the software that is
>> specifically configured for the chip.
> Why does it bother you?
> Theoretically x86-64 should be slightly slower for most uses unless you:
> 1) have a process that needs > 4gb of virtual address space
> 	-or-
> 2) does a lot of 64 bit math that can't be performed with SSE

x86_64 is also better at memory copies. for processes mainly doing memcpy, 
memmove etc, you may see a performance increase.


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