Re: avail memory is short by 1G on my FreeBSD 6.0-STABLE MP Dell

eculp_at_bafirst.com
Date: 11/23/05

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    Date: Wed, 23 Nov 2005 11:16:26 -0600
To: freebsd-current@freebsd.org

    Quoting eculp@bafirst.com:

    > Quoting Paul Saab <ps@freebsd.org>:
    >
    >> Chad Leigh -- Shire.Net LLC wrote:
    >>> I assume you are talking about the "phenomenon" of RAM "missing"
    >>> due to PCI and other I/O mapping into the 4GB address space? What
    >>> struck me about the OP is that the amount of RAM "missing" is more
    >>> than I have ever seen due to this. My systems are usually
    >>> 3.4-3.6GB of RAM with 4GB installed, not 2.86GB (3005MB)... So are
    >>> we sure that the PCI space mapping is the problem?
    >>>
    >> Enable PAE and you'll get all your ram.
    >
    > Done that but I am going to wait until early tomorrow morning to
    > reboot because I want to get a verbose boot with this kernel and then
    > try the PAE kernel, for whatever.

    For Closure, enable PAE seems to get all ram as Chad said. I found the
    amounts a bit strange but a heck of a lot better.

    Boot with PAE now shows:
       real memory = 5368709120 (5120 MB)
       avail memory = 4185292800 (3991 MB)

    Boot withoug PAE shows:
       real memory = 3220963328 (3071 MB)
       avail memory = 3151077376 (3005 MB)

    Of course now I will need to recompile the kernel with the modules that
    we now load, some of which I forgot but probably a small price for
    almost a GB more memory and if I'm lucky the kernel might even be a bit
    faster ;)

    Thanks again for all your suggestions and comments, it was definitly a
    learning experience.

    ed

    P.S. No problem at all with the kernel booting or anything, just be
    sure to compile in all the modules that you are now using.
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