copier-colle de la news paru sur linuxfr:
"Les Athlon/Duron/AthlonMP se retrouvent sous les feux de l'actualité avec la mise en lumière d'un bug important, qui est dû à l'utilisation de pages mémoires par les processeurs pentium de taille beaucoup plus importante que les 4K conventionnels (extended paging).
Or les processeurs AMD de la gamme sus-citée provoquent des corruptions mémoire lors de l'utilisation de cette technologie avec l'AGP.
Voici un extrait (en anglais) de l'explication et un "Workaround" pour contourner rapidement le problème en attendant un patch.
"As you may know, x86 systems have traditionally managed memory using 4K pages. However, with the introduction of the Pentium processor, Intel added a new feature called extended paging, which allows 4Mb pages to be used instead. Here's the problem -- many Athlon and Duron CPUs experience memory corruption when extended paging is used in conjunction with AGP. And, this problem hits us because Linux 2.4 kernels compiled with a Pentium-Classic or higher Processor family kernel configuration setting will automatically take advantage of extended paging (for kernel hackers out there, this is the X86_FEATURE_PSE constant defined in include/asm-i386/cpufeature.h.) Fortunately, there is a quick and easy fix for this problem. If you have been experiencing lockups on your Athlon, Duron or Athlon MP system when using AGP video, try passing the mem=nopentium option to your kernel (using GRUB or LILO) at boot-time. This tells Linux to go back to using 4K pages, avoiding this CPU bug. In addition, it should also be possible to avoid this problem by not using AGP on affected systems."
"
source : linuxfr.org/gentoo.org
[edtdd]--Message édité par Drdrake--[/edtdd]
