on 12-5-2008 4:18 PM Rainer Duffner spake the following: > 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. > You will only see a gain if the machine is swapping, otherwise more ram through PAE could even be slower. Maybe up to 5% slower depending on the machines bios and memory bus speed. -- MailScanner is like deodorant... You hope everybody uses it, and you notice quickly if they don't!!!!
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