FreeBSD 7.0 and RAM limit

[Ivan Voras]

Robert Heron wrote:
> Hi,
> 
> I use:
> 
> FreeBSD 7.0-R on i386 server with motherboard S5000VSA and 6GB RAM 
> onboard. BIOS version - 88 (the latest)
> 
> Kernel includes: options        MAXMEM=(6*1024*1024)

You generally shouldn't touch MAXMEM as it's autotuned.

> And FreeBSD reports only:
> 
> real memory  = 2680160256 (2556 MB)
> avail memory = 2617892864 (2496 MB)
> 
> Why? What is wrong that FreeBSD sees only about 2.5GB instead of 6GB?

Having only 2.5 GB is a bit severe (do you have lots of PCI hardware? 
video cards with lots of memory?), but PAE could be your solution. See here:

http://www.freebsd.org/doc/en_US.ISO8859-1/books/faq/compatibility-memory.html


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