<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type"> </head> <body bgcolor="#ffffff" text="#000000"> Jim Kronebusch wrote: <blockquote cite="mid20070904133604.M20636@winonacotter.org" type="cite"> <pre wrap="">On Tue, 4 Sep 2007 18:00:19 +0800, Jean Phil wrote </pre> <blockquote type="cite"> <pre wrap="">I have installed k12ltsp 6.0 64bit on a Pentium D with 4 GB of memory. But according to the system monitor I have only 3.2 GB memory. How can I get all 4 GB ram? </pre> </blockquote> <pre wrap=""> 3.2 GB almost certainly indicates you are running a 32-bit kernel. Try installing the server kernel and see if that helps. </pre> </blockquote> Another possibility is that the computer is saddled with a 32-bit motherboard chipset. Anything with, as just one example, an Intel i945 chipset will have this problem. I have a laptop affected by this. The CPU is an Intel Core 2 Duo 64-bit, the kernel is 64-bit (Ubuntu Feisty x86-64), but the chipset has space for only 2^32 memory addresses. If that's what's going on, then that means that, no matter *what* you do, the PCI addressing will suck up your top-end address space, 64-bit kernel or not, due to the chipset's hardware limitation. In my Latitude D620, the BIOS shows two 2GB sticks installed, but only 3.25GB available for use. I spent five hours on the phone with Dell before I finally got them to admit this (the i965 fixes that problem--it addresses 2^33 bytes, or 8GB). Check out your chipset and see which one it is. "lspci" should be quite helpful in that regard. --TP </body> </html>