linux on sata disk and 4gb memory

[backgroundman]

Hi, I have a pc with
ASUS P4P800-X (i865 + ICH5)
P4 3.0E
4GB DC-DDR333@320 (4x1GB Kingston)
Seagate 200GB SATA
and I am running Linux (Woody)

I have the same problem with more than one kernels
When I have 4GB memory the system is running too slow, but when I have 2GB memory is running fine. I run Knoppix (liveCD) and WinXPPro_SP1 (liveCD) and the system with 4GB memory goes fine.
I have try kernels 2.6.9 , 2.4.28 , 2.4.26 , 2.4.19 , 2.4.17 but nothing.

I can't understand if the problem is in ich5 or on kernel configuration.

Can anyone help ???

[zdawg]

Enable himem support in kernel.

[UgoDeschamps]

as zdawg said, himem isnt enabled by default and since you have a large Mb Ram capacity, this option is deffinitly required for your system to be optimal :P

[backgroundman]

I have try 4GB and 64GB support in the kernel but the performance is still low.

[UgoDeschamps]

Since you've try many Kernel the problem probly isn't from this...
Did you install the latest BIOS of your MB
did you try contacting ASUS regarding having a full 4Gb ram setup, (i've use old mb in the past sold with 256mb ram support, that never worked over 64mb)

Did you try putting only 3 (one DIMM removed)
Is there a setting that "auto" calculate the ram... can you set it manually

Those are all "Ipothetic" but are exactly the step I would take to troubleshoot this problem... It could even be (i've seen this before) one of your slot isn't working properly

[backgroundman]

I have try Knoppix Live CD and WinXP Pro SP1 LiveCD and WinXP Pro SP1 from HDD and everything was fine with 4GB memory. So I think that kernel is the problem, something with 4GB memory support and SATA support on ICH5.
I have the latest bios and I have check the memory (4GB) with memtest86+ for over 2 hours.
I have not send mail to ASUS because I am thinking that the problem isn't in the m/b but at the kernel configuration.