[gentoo-user] 2GB of RAM

[Ralph Slooten]

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Hi list,

Today I expended my RAM to 2GB (DDR) to my workstation, as apposed to
the initial 1GB I had. The RAm added is identical to the initial RAM.
Without changing the kernel (2.6.16.x) I still get 1GB available, and
digging into the kernel I found the section regarding the High Memory
Support and Memory split.

I did a bit of googeling, the first page I found (old) said to turn on
High Memory Support, however a more recent page
(http://linux-vserver.org/Step-by-Step+Guide+2.6) states to leave it off
and just change the split to 2/2 to make full use of 2GB of RAM.

I tried both ways, but either way I get poor 3D performance from UT2004
when I have this extra memory in.

Now I'm confused ;-) It's (kernel's) default is "3G/1G user/kernel
split" but there seems to be no documentation supplied with my kernel
(2.6.16.5).

Do any of you have experience with > 1GB of RAM, and efficiently getting
this to work _well_ on your systems? What ideal settings should I use in
my kernel? Are there any downsides to > 1GB?

With "3G/1G user/kernel split" selected, and "High Memory Support (off)"
I get 1GB despite 2GB in the motherboard, even when lilo boots with
append="mem=2048M". If I enable the 2/2 option instead I get 2G of RAM.
I tested the 2GB with 2x virtual machines (vmware) running each with
512MB ram (iE 1GB in use for vmware) and the system performed still
exceptionally well, however UT2004 still sucks when playing (sluggish
and screen jolts from time to time like I have too little RAM).

Any ideas?

Thanks,
Ralph

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