So here's my questions. 1. If I install Kernel manually (downloading latest kernel), is the .config file on my disc and can I use it so my starting point is the setup for this pc? Is this the one? /usr/src/kernels/2.6.9-11.EL-i686/.config 2. There is a routine for upgrading a upgraded kernel with the rpm tool, is it available a upgraded kernel for Centos 4.1 or can I use latest fedora kernel? 3. I read some place how to make a kernel the rh way or something (making a rh kernel from the kernel.org kernel) Has someone a good routine for this? Small pointers and links would be appreciated. Spec. and info CentOS 4.1 – amd64 athlon s754 Linux localhost.localdomain 2.6.9-11.EL #1 Wed Jun 8 16:59:52 CDT 2005 i686 athlon i386 GNU/Linux I have been running 64bit and 32 bit back and forward a couple of times on my desktop and ended up going back to 32 bit. Even thou I now 32 bit programs run on 64 bit, I need Java fully supported. My concern is that I believe that I visually can see some difference in performance and that the 64 bit seems to be a little more stable and faster. My impression nothing more, programs don't hang as long etc. Therefore I would like to upgrade my Kernel to see if this will help me. kai