rawhide report: 20050706 changes

[Dave Jones]

On Wed, Jul 06, 2005 at 12:42:26PM -0700, Jesse Keating wrote:
 > On Wed, 2005-07-06 at 14:56 -0400, Dave Jones wrote:
 > > 
 > > I'm confused. I think I missed the point of your original question.
 > > The only real benefit of running the 32 bit kernel is if you have
 > > some 32 bit application that doesn't work under 32bit-emulation of
 > > the 64bit kernel.  There really shouldn't be that many of these.
 > 
 > Heh, no.  What I meant was, on a 32bit platform, is there benefit to
 > running a smp kernel on a UP system?  Because it technically is an
 > x86_64 processor, it is just not running in x86_64 mode.

If your CPU supports NX, then the SMP kernel will use it, whereas
the UP kernel will use segment limits, and disable sysenter support.
If it doesn't support NX, there's no particular benefit.

		Dave