On Dec 5, 2008, at 7:18 PM, Rainer Duffner <rainer@xxxxxxxxxxxxxxx>
wrote:
>
> Am 06.12.2008 um 01:02 schrieb Ignacio Vazquez-Abrams:
>
>> On Fri, 2008-12-05 at 23:57 +0000, Michael Holmes wrote:
>>> 2008/12/5 Matt <lm7812@xxxxxxxxx>:
>>>> I have a server running Centos 4.7 32bit. Will moving from 4Gig of
>>>> RAM to 8Gig do any good? Since its 32bit I assume it will only be
>>>> able to address the first 4Gig not?
>>> As long as you are using a SMP kernel you can use up to 64GB of RAM
>>> (though each proccess can only address 4GB of this). So if you can
>>> find any trace of "SMP" in the uname (grep is your friend) then it
>>> should work fine.
>>
>> PAE, not SMP.
>>
>
>
> He should be able to replace the kernel via rpm -e and rpm -i
>
> That said, I doubt he'll actually see a benefit.
> PAE is slow.
> If you want to see a real performance-gain, install 5.2 x86-64.
He'll see a benefit. PAE slowdown is humanly unnoticeable for short-
term transactions, it's difference is in high nano seconds or low
micro seconds.
All 5.0 kernels are PAE by default.
So are WinXP_SP2/Win2K3/Vista/Win2k8 and Mac OS X kernels.
Only go 64-bit if it's completely necessary.
-Ross
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