4GB RAM slows down ubuntu

[Michael Zoet]

> Hi,
>
> yesterday i installed kubuntu in order to get rid of a silly problem: When
> i add 1GB RAM (3x 1GB are already inserted), Suse 10.1 got very very slow.
> Booting Windows or Knoppix makes no problem with 4GB. Now after installing
> kubuntu with kernel 2.6.24-24-generic the problem is the same: 3GB are ok,
> 4GB slow down the system dramatically (2, 3 times slower). At a certain
> point during booting, the moving bar stucks. Where can i search for the
> problem?
>
> It is a ASUS P4P800 SE Mainboard.
> RAM is said to be supported,
> the BIOS recognises it (it says 3,7GB but this is documented in the
> manual), even in dual channel mode.
> RAM is ok and all 1GB bar fit together. (memtest gives no errors.)
> again; Windows XP (and Knoppix) has no problems, (Knoppix is a bit slow as
> it is running from CD, therefore i wouldn't  swear that it is not slower.)
>
> Is this a known bug or has someone an idea for a solution?
>

You need to supply much more details! I assume you are using the 32 bit
versions of all tested OSes. If so, you should use the 64 bit versions!

I use a lot of systems (mixed Ubuntu and Debian) with more than 4 GB of
RAM and have no performance issues because of to much RAM! Even the 32 bit
ones.

For Windows XP: if you are using the 32 bit version of XP, you get only 3
GB addressed. No wonder that XP behaves the same with 4 GB :-). As always:
if something just runs on a Windows OS, this must not be good sign! And if
you are using the 64 bit version of XP you would get a lot of other non
working issues...

Michael