Re: Problems with AMD64 and 8 GB RAM?

From: Greg 'groggy' Lehey (grog_at_FreeBSD.org)
Date: 03/31/05

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    Date: Thu, 31 Mar 2005 08:13:51 +0930
To: Scott Long <scottl@samsco.org>

    On Wednesday, 30 March 2005 at 15:30:37 -0700, Scott Long wrote:
    > Greg 'groggy' Lehey wrote:
    >> I've recently acquired an AMD64 box ...
    >>
    >> What's unstable? ... The amd64 5.4-PRERELEASE kernel just
    >> hangs/freezes.
    >
    > 5.3-RELEASE has a lot of problems with >4GB due to busdma issues.
    > Those should no longer be an issue in RELENG_5, including 5.4-PRE.

    They appear to be.

    >> I realize that this isn't enough to diagnose the problem. The reason
    >> for this message now is to ask:
    >>
    >> 3. Where should I look next?
    >
    > You'll need to dig in and provide some more details, I guess.

    Yes, my guess too.

    > I have an HDAMA dual Opteron system that behaves fine now with 8GB
    > of RAM, so your problem might lie with particular hardware and/or
    > drivers.

    As I described, it doesn't appear to be the drivers.

    Greg 

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