This is a discussion on Re: Dual Core Xeon / i386 install w/ more than 4gb of RAM - FreeBSD ; Kevin K wrote: > I have a box that we recently installed 16GB of RAM on. The box is i386 > FreeBSD 6.2. It only recognizes 4gb. Several people have already pointed out that you can either run FreeBSD/i386+PAE or ...
> I have a box that we recently installed 16GB of RAM on. The box is i386
> FreeBSD 6.2. It only recognizes 4gb.
Several people have already pointed out that you can either
run FreeBSD/i386+PAE or FreeBSD/amd64 (64bit).
However, there's an important piece of information missing:
_Why_ did you install 16 GB of RAM? The answer to that
question might give an indication which of the two ways
would be best for you.
For example, if you need to run a single large application
that needs much RAM, then i386+PAE won't help you at all,
because you still have a 4 GB address space limit and a
4 GB process size limit. Actually much less than 4 GB
because the 32bit address space is shared between kernel
To get rid of the 4 GB limit completely, you must install
FreeBSD/amd64. Also, amd64 code is often (but not always)
faster than i386 code.
My recommendation is that you use amd64, unless there is
a specific reason you can't do that, e.g. you depend on
a driver or third-party software that won't run on amd64.
Then i386+PAE is your only choice, unfortunately.
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