physical memory

[Cannon, Andrew]

We also have this problem with a RH4 system (EM64T and the smp kernel) using
4GB memory (P4 650).  The BIOS sees 4GB memory, but RH only sees 3.3GB
memory.  Apparently, this is an Intel chipset issue and cannot be fixed
using software (apparently).  Intel are aware of it, but have not put any
fix out yet.  I don't know about AMD processors (the systems we have using
AMD processors only have 2GB), but our Intel system with 4GB has lost 700MB
of memory.

Intel do assure us that the OS can see the whole 4GB of memory, but I don't
think I believe them too much...

Andy

-----Original Message-----
From: nilesh vaghela [mailto:nileshj.vaghela at gmail.com]
Sent: 01 December 2005 05:39
To: General Red Hat Linux discussion list
Subject: Re: physical memory


If you can upgrade to AS 4.0 would be the best.
Other wise you can use hugemem kernel.
as suggested by Tobias Speckbacher

Nilesh

On 12/1/05, Tobias Speckbacher <TSpeckbacher at quova.com> wrote:
>
> > -----Original Message-----
> > From: redhat-list-bounces at redhat.com [mailto:redhat-list-
> > bounces at redhat.com] On Behalf Of Mindy Preston
> > Sent: Wednesday, November 30, 2005 10:02 AM
> > To: General Red Hat Linux discussion list
> > Subject: Re: physical memory
> >
> > Brian,
> >
> > Are you running a 64-bit version of Red Hat?  If you're running a
> 32-bit
> > one you will be limited to 4GB of memory, since more can't be
> addressed
> > by 2^32.
>
> The hugemem kernel supports up to 64GB of memory for 32 bit AS3 systems.
> There is some performance impact to using memory sizes over 4GB on 32bit
> systems, from what I read 2-3%.
>
> The limiting factor is the maximum memory allocation per user process,
> which can not be larger than 4GB, the same goes for kernel address
> space.
>
> For reference please check:
>
> http://www.in.redhat.com/software/rhel/3features/
>
> >
> > -Mindy
> >
> > --
> > redhat-list mailing list
> > unsubscribe mailto:redhat-list-request at redhat.com?subject=unsubscribe
> > https://www.redhat.com/mailman/listinfo/redhat-list
>
> --
> redhat-list mailing list
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>


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