[K12OSN] 8 GB RAM on 32-bit Edubuntu with AMD 64 processors

[Robert Arkiletian]

On 11/26/07, James P. Kinney III <jkinney at localnetsolutions.com> wrote:
> The PAE will be a nightmare for the heavily shared setup of LTSP. In
> short, the system will thrash doing high page swaps to access RAM. If
> all processes under current request are spread over multiple pages, the
> performance will be beyond horrible.
>
> If you _must_ use 32-bit on a AMD-64 bit machine, put no more than 4GB
> RAM in the system. Even then you may loose 512MB (depends on mainboard
> chipset). I'm not sure if the Nvidia chips will loose RAM as all of my
> servers using those have 8GB or higher and 64-bit OS.

I have 4GB of ram. My kernel is using PAE so I see all 4GB. Wondering
if performance hit (some say 6-8%)  is only for that extra 512MB or
for the entire 4GB?

Also wondering how does one disable PAE? Running 4.2.3EL the 2.6.9.x
kernel has PAE enabled by default. Is there a kernel rpm I can
download or will I have to recompile the kernel?

-- 
Robert Arkiletian
Eric Hamber Secondary, Vancouver, Canada
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