On Dec 5, 2008, at 7:18 PM, Rainer Duffner rainer@ultra-secure.de 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@gmail.com:
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