physical memory

Tobias Speckbacher TSpeckbacher at quova.com
Wed Nov 30 22:58:35 UTC 2005


> -----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
> 
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