If I try to activate the DRI with:
Section "Module"
Load "dri"
load "glx"
Load "GLcore"
EndSection

in my xorg.conf with the hyperthreading activated, xorg and the all computer freeze after a minute. Cannot even access it with ssh.

Any idea? Didn't find that much informations on internet.

did you modprobe the correct modules?

Yep, normally all is ok, as my computer works properly if I de-activate the hyperthreading...

results of lsmod:
Module Size Used by
radeon 103296 1
drm 61716 2 radeon
af_packet 18056 0
ndiswrapper 165684 0
eth1394 17928 0
pcmcia 31148 2
yenta_socket 23052 3
rsrc_nonstatic 11392 1 yenta_socket
pcmcia_core 34584 3 pcmcia,yenta_socket,rsrc_nonstatic
ide_cd 35204 0
ohci1394 31156 0
ieee1394 283608 2 eth1394,ohci1394
ati_agp 7436 1
agpgart 27472 2 drm,ati_agp
video 14596 0
thermal 11528 0
processor 19624 1 thermal
fan 4228 0
container 4096 0
button 5776 0
battery 8452 0
ac 4356 0
ehci_hcd 28168 0
ohci_hcd 19076 0
usbcore 101120 4 ndiswrapper,ehci_hcd,ohci_hcd

radeon and drm is suppose to be disable.

DRM is incompatible with fglrx (this module interferes with it)
and radeon will mess up your display if you move back and forth from Xorg to the framebuffer, then back.
*edit*you can keep radeon, just don't move around to the consoles.*/edit*

But I'm not using the fglrx, which is the official ATI driver, because I have the ATI 340m which is not supported by this driver.

I'm using the radeon open source driver...

Oh? Sorry, I have mistaken the "radeon" entry for the "radeonfb" one.

From this website:
http://gentoo-wiki.com/HOWTO_DRI_wit...Source_Drivers

You seam to have done everything correctly. (just a quesiton: which computer model? Just curious...)

I see two potential errors:
You may not have actiated the modules in the right order. (I think drm, agpgart, ati_agp, and then radeon would be the order, if the order is similar to fglrx). and I'm thinking that because agpgart is not using radeon....
You may not have the correct [insertchipsetnamehere]_agp module.

But I don't understand why it is working in mono-processor (no hyperthreading), and the bug appears with 2 processors (with hyperthreading)...

Anyway, my computer is a Toshiba Satellite A60 (which has loads of problem with Linux...)

Interesting, I have Toshiba Satellite P30, it's similar.

Are you using binaries, or are they compilled from source?

i'm using binaries, the package made by Mandriva...

Anyway, i gave up with that problem... Too much problems with hyperthreading and Linux, and not much performance...

thanks anyway!

I have hyperthreading and it works well.

I suggest to build the drivers yourself, if you install a driver from another kernel version then yours, it creates problems.

You are welcome to come back to troubleshoot if that's what you want later on.