Problems with AMD64 and 8 GB RAM?

Greg 'groggy' Lehey grog at
Wed Mar 30 14:43:56 PST 2005

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.

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