4GB installed - RH reports 3.2?!?

[Smith, Albert]

> -----Original Message-----
> From: redhat-list-bounces at redhat.com 
> [mailto:redhat-list-bounces at redhat.com] On Behalf Of inode0
> Sent: Friday, September 23, 2005 9:15 AM
> To: General Red Hat Linux discussion list
> Subject: Re: 4GB installed - RH reports 3.2?!?
> 
> On 9/23/05, Smith, Albert <Albert.Smith at genexservices.com> wrote:
> > By default on most configs the default kernel installed 
> will either be 
> > the EL or the SMP EL kernel. It's not difficult to add the 
> additional 
> > kernel. I would just do an up2date kernel-hugemem  and it will pull 
> > down the current hugemem kernel and dependents. This is 
> assuming you 
> > are on the RHN.
> 
> I'm curious about this as the hugemem kernel generally isn't 
> necessary for only 4GB of ram. I've heard of this same 
> problem with opterons and iirc it was related to how memory 
> was allocated to devices sharing memory on the PCI bus (AGP I 
> think was the culprit in the case I'm thinking of). In that 
> case there was a bios setting that "recovered"
> the memory.
> 
> I'm just tossing this out as a possibility, I'm not very 
> confident and don't have a good understanding of the memory 
> situation on x86_64 systems.
> 
> John
> 
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The General Rule of thumb is < 4G use the standarded kernel 4G > use the
hugemem kernel. It won't hurt anything if you use the hugemem kernel and
not have a greater then or equalk to 4gig. It just opens up some
additional addressing and it could help with memory detection.

Albert Smith
Sr. Unix Systems Administrator
HPCSA, RHCT  
Genex Services
440 E. Swedesford Rd.
Wayne, PA 19087
albert.smith at genexservices.com
(610) 964-5154