Problems with AMD64 and 8 GB RAM?

Greg 'groggy' Lehey grog at
Wed Mar 30 15:38:28 PST 2005

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On Wednesday, 30 March 2005 at 16:23:34 -0700, Scott Long wrote:
> Greg 'groggy' Lehey wrote:
>> On Wednesday, 30 March 2005 at 16:04:44 -0700, Scott Long wrote:
>>> Greg 'groggy' Lehey wrote:
>>>> 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 don't understand what you mean here.
>> As I said above (and trimmed for convenience), this problem occurs on
>> 5.4-PRERELEASE as of yesterday morning.  The dmesg shows that too.
> And you're certain that it's due to the same busdma issues that I
> was describing?


> I must have missed the evidence that you use to support this.

I didn't give any.  It appears that I misunderstood what you were

>>>> As I described, it doesn't appear to be the drivers.
>>> I don't see how you proved or disproved this.
>> Shall I resend the original message?  It seems independent of any
>> particular driver.  That's not proof, of course, but I didn't claim it
>> was.
> Again, I must have missed the part where you investigated the drivers
> that apply to your particular system.

The description is still there.

> I highly doubt that they apply to every 8GB Opteron system available
> on the market.

I never suggested that they did.  There's every reason to believe that
it's something to do with this particular motherboard, but that
doesn't mean that FreeBSD is blameless.

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