Amd64/Em64T On Xw9300 Total Memory May Be Less Than Expected With X86_64 Kernel; Description; Scope; Resolution - HP xw3400 User Manual

AMD64/EM64T on xw9300 Total Memory May Be Less Than Expected
with x86_64 Kernel

DESCRIPTION

The RHEL3 64-bit kernel that is installed on xw9300 Workstations is the x86_64 kernel.
If the kernel reports less memory than expected (due to the kernel's need to allocate space for memory
mapped I/O), you can enable Memory remapping to access the remapped memory. Your system
will then report the full amount of memory installed.
With Memory Remapping disabled you may see nearly 1GB less of memory than expected due to the
fact that the kernel reserves the ~3GB to 4GB region of memory for memory mapped IO.
With a 64-bit OS, HP recommends that Memory remapping be enabled.

SCOPE

HP xw9300 Workstation with RHEL3 64-bit OS

RESOLUTION

To enable Memory Remapping in the BIOS:
Reboot the workstation.
1.
When you see the blue highlighted "F1: Boot" press F10 for Computer Setup Utility.
2.
Select your language.
3.
Use the Arrow keys to move across to Advanced.
4.
Use the Arrow keys to move down to Chipset/Memory.
5.
Use the Arrow keys to move down to Memory Remapping.
6.
Use the Right Arrow key to set the entry to "Enable".
7.
Press F10 to Accept, Press F10 again followed by the Enter key and press F10 one last time to
8.
save the changes.
Boot as usual.
9.
x86 on xw9300 Total Memory May Be Less Than Expected with the
athlon Kernel
DESCRIPTION
The RHEL3 32-bit kernel that is installed on HP xw9300 Workstations is the UP and SMP athlon
kernels. These kernels are intended for systems that have up to 4GB of memory installed.
To determine if you are running the athlon kernel, you first need to determine what kernel RPMs you
have installed:
'rpm -q --qf "%{N}.%{V}-%{R}.%{ARCH}\n" kernel'
'rpm -q --qf "%{N}.%{V}-%{R}.%{ARCH}\n" kernel-smp'
'rpm -q --qf "%{N}.%{V}-%{R}.%{ARCH}\n" kernel-hugemem'
This will list all the kernel packages that may be installed on your system. From that list you can see
which RPM packages are for i686 and athlon. You will then need to do 'uname -r' and match the
currently running kernel version with the RPM package to determine if you are running the
kernel*.athlon.rpm kernel.
If you have more than 4GB of memory installed, you may want to install the i686 hugemem kernel to
access memory above 4GB.
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