rawhide report: 20050706 changes

[Brian Gerst]

Dave Jones wrote:
> On Wed, Jul 06, 2005 at 02:34:40PM +0200, Thomas Woerner wrote:
>  > Arjan van de Ven wrote:
>  > >On Wed, 2005-07-06 at 07:13 -0400, Build System wrote:
>  > >
>  > >>- Drop x86-64 SMP kernels, and make generic kernel use SMP.
>  > >why is this??
>  > Why only for x86_64?
> 
> 32 bit has a lot more history of crap hardware.  It's almost
> guaranteed that there are 32bit UP boxes out there that won't
> boot the SMP kernel.
> (In fact, it's certainly guaranteed because the 686-smp kernel
>  uses PAE, which not all 686's have)
> 
> x86-64 has had an APIC since day 1.  It hasn't had to worry
> about crap like PAE.  As it doesn't have this baggage, the
> decision is a lot easier to make there.

What about the bloat and slowdown because of the unnecessary spinlocks 
and more complex scheduler code?

--
				Brian Gerst