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SubjectRe: [Drifting off-topic] Re: Cyrix Detection -- NO SMP, please ?????
On 20 Oct 1998, david parsons wrote:

> Though this does beg the question of `why bother?' -- I know that there
> are some ppro optimizations that speed things up, but for a casual user
> will they even be noticable? Since the 805xx chips are just a little
> bit faster than the 80386 chips, does it REALLY cripple performance to
> have a 386 kernel on your Xeon (80524?) 800 machine?

Remember the early days of 2.1 and the new copy_from_user stuff using
exceptions instead of walking vmas? That alone makes the difference
between a kernel compiled for a 386 vs a 486 or higher quite a significant
performance difference (I think someone said around 200+ instructions for
verify_area vs about 2 for copy_from_user).

-ben


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