Date: Thu, 27 Sep 2007 06:35:53 +0100 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: Erich Dollansky <oceanare@pacific.net.sg> Cc: Paul Schmehl <pauls@utdallas.edu>, freebsd-questions@freebsd.org Subject: Re: Dual Opterons don't see all memory Message-ID: <46FB4139.8020104@infracaninophile.co.uk> In-Reply-To: <46FB32B3.10800@pacific.net.sg> References: <DF52D4C2-523B-48E4-957A-01FB81C80FC3@CS.UCLA.EDU> <46FB2A26.8040507@pacific.net.sg> <74CB72FB-0B36-4945-B121-E61E07BAA4F5@CS.UCLA.EDU> <26F3B5E1A6FC015BDA8980FB@paul-schmehls-powerbook59.local> <46FB32B3.10800@pacific.net.sg>
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Erich Dollansky wrote:
> Paul Schmehl wrote:
>> --On September 26, 2007 9:06:57 PM -0700 Eric Osterweil
>> <eoster@CS.UCLA.EDU> wrote:
>>
>>> On Sep 26, 2007, at 8:57 PM, Erich Dollansky wrote:
>>>
>>>> Eric Osterweil wrote:
>>>>
>>>>> make use of it's 6GB of memory, and FreeBSD can only see about 4GB
>>>>> of it.
>>>>> Can anyone help me figure out how to make use of the missing GB?
>>>>> FreeBSD 6.2-RELEASE #0: Fri Jan 12 11:05:30 UTC 2007
>>>>
>>>> this looks like a 32 bit binary to me.
>>>>
>>>> You either need a 64 bit binary or you need to enable PAE.
>>>>
>>>> Just build a custom kernel for 64 bits.
>>>>
>>>
>>> Ahh... To do this, do I just specify the CPUTYPE in the /etc/make.conf
>>> as:
>>> CPUTYPE=amd64
>>> ?
>>>
>> No. Add options SMP to GENERIC or use the SMP conf file that's
>> already there (and includes GENERIC). Then recompile the kernel per
>> the handbook.
>>
> he still has to set the CPU type also in this config file to amd64.
If the OP has installed FreeBSD i386 then changing the CPU type in
/etc/make.conf won't magically get him FreeBSD amd64 --- it will just
get him FreeBSD i386 optimized for AMD processors running in 32bit
mode.
As far as I know, there is no simple way to start with a 32-bit
system and the FreeBSD sources and recompile and reinstall everything
into a 64-bit system. (Although the opposite direction is apparently
possible on 7-CURRENT, but it's a guru-only level of difficulty.)
The best and most effective answer here is to start by downloading
an amd64 installation CD and redo the whole thing from scratch.
Cheers,
Matthew
- --
Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard
Flat 3
PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate
Kent, CT11 9PW
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