Re: Strange Kernel for Centos 5.5

[John R Pierce <pierce@xxxxxxxxxxxx>]

On 02/11/11 8:39 AM, m.roth@xxxxxxxxx wrote:
> They have*everything*  to do. Look, I*said*  this is OT, but since you
> insist, the overwhelmingly*bad*  design decision was to put the GUI into
> ring 0, instead of the way Windows 3, and X on*Nix, and *everybody*  else
> did, resulting in a GUI error bringing down the*entire*  system.

the "GUI" is a fairly nebulous term.       The graphics display driver 
is indeed at ring zero for performance (in fact in early versions of NT, 
it ran in ring 1 or 2, but the performance hit of the ring transitions 
to access IO ports on early graphics cards was overwhelming so in NT4 it 
was moved to ring0).   However, the GDI, User (window manager), desktop, 
and about everything else are in ring3 user space.


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