On Sunday 03 January 2010 17:05:54 Keith Edmunds wrote:
> You shouldn't need to do anything so long as you're running a
>  reasonably recent kernel. Which kernel version is it? What's the
>  output of "cat /proc/memory|head -1"? If you have access to the
>  configuration file the kernel was built to (often found in /boot),
>  run "grep CONFIG_HIGHMEM" on it and post the output.
It's not recent, but it's not *that* old:
fenris ~ # uname -a
Linux fenris 2.6.24-gentoo-r4 #4 SMP PREEMPT Fri May 9 09:40:16 BST 2008 
x86_64 AMD Athlon(tm) 64 Processor 3200+ AuthenticAMD GNU/Linux
I assume you mean /proc/meminfo:
fenris ~ # cat /proc/meminfo
MemTotal:      3095324 kB
There isn't a CONFIG_HIGHMEM defined in the .config file.