Strangely enough I saw all of the memory for a brief period of time. Is
there any way to find out the parameters used to compile the kernel I am
currently running? Short of recompiling the kernel there isn't anything I
can do is what I gather here. Thanks for the help everyone.
Skottie Miller
<[EMAIL PROTECTED] To: [EMAIL PROTECTED]
mworks.com> cc:
Sent by: Subject: Re: Memory more than 4GB?
seawolf-list-admin
@redhat.com
07/18/2002 02:32
PM
Please respond to
seawolf-list
ia32 XEON processors support Paged Address Extension (PAE), which gives
them
the ability to address 36-bit addresses == 64GB of memoery.
to use more than 4GB, your kernel needs to be compiled with the
correct combination of patches and configuration options.
take a look at the kernel config option "high memory support".
From the help item for high memory support:
CONFIG_NOHIGHMEM:
Linux can use up to 64 Gigabytes of physical memory on x86 systems.
However, the address space of 32-bit x86 processors is only 4
Gigabytes large. That means that, if you have a large amount of
physical memory, not all of it can be "permanently mapped" by the
kernel. The physical memory that's not permanently mapped is called
"high memory".
If you are compiling a kernel which will never run on a machine with
more than 960 megabytes of total physical RAM, answer "off" here (default
choice and suitable for most users). This will result in a "3GB/1GB"
split: 3GB are mapped so that each process sees a 3GB virtual memory
space and the remaining part of the 4GB virtual memory space is used
by the kernel to permanently map as much physical memory as
possible.
If the machine has between 1 and 4 Gigabytes physical RAM, then
answer "4GB" here.
If more than 4 Gigabytes is used then answer "64GB" here. This
selection turns Intel PAE (Physical Address Extension) mode on.
PAE implements 3-level paging on IA32 processors. PAE is fully
supported by Linux, PAE mode is implemented on all recent Intel
processors (Pentium Pro and better). NOTE: If you say "64GB" here,
then the kernel will not boot on CPUs that don't support PAE!
The actual amount of total physical memory will either be auto
detected or can be forced by using a kernel command line option such
as "mem=256M". (Try "man bootparam" or see the documentation of your
boot loader (grub, lilo or loadlin) about how to pass options to the
kernel at boot time.)
If unsure, say "off".
-------------------
-Skottie
Taylor, ForrestX wrote:
> Benjamin S. Moore wrote:
>
>> Will RedHat 7.1 recognize memory greater than 4GB? I have the append
>> ="mem=7168MB" in my lilo.conf but still it only recognizes the 4GB. Any
>> help would be GREATLY appreciated.
>
>
> IIRC an 32-bit processor can only address a maximum of 4 GB (2^32) RAM
> http://www.devx.com/Itanium/art_Database.asp
>
> Forrest
--
Scott Miller | Animation Technology
work: [EMAIL PROTECTED] | Dreamworks Feature Animation
life: [EMAIL PROTECTED]
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