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
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