Messages in this thread | | | Date | Wed, 21 Oct 1998 12:08:13 -0400 (EDT) | From | "Benjamin C.R. LaHaise" <> | Subject | Re: [Drifting off-topic] Re: Cyrix Detection -- NO SMP, please ????? |
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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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