[PATCH] optimizing X now that we don't support i386 CPU's on 6-CURRENT

Garance A Drosihn drosih at rpi.edu
Sun Oct 17 19:39:44 PDT 2004


At 7:20 PM -0700 10/17/04, David O'Brien wrote:
>
>     ----------------------------
>     revision 1.296
>     date: 2001/01/14 10:11:10;  author: jhb;  state: Exp;  lines: +2 -2
>     Remove I386_CPU from GENERIC.  Support for the 386 seriously
>     pessimizes performance on other x86 processors.  Custom kernels
>     can still be built that will run on the 386.
>     ----------------------------
>
>I remember someone tried a few years ago after this commit to get
>FreeBSD 5-CURRENT running on an I386 and had to hack some things to
>get it work.  Since no one has reported success in doing this since
>then I'm willing to bet you dinner next time I'm in Bejing that we've
>broken running on real I386's w/o realizing it.

For what it's worth, I was also under the impression that we were
going to recommend that people running a "genuine 80386" chip should
probably stick with the 4.x-series of releases.  Even if 5.3 works on
80386 right now, I was not sure that it would continue to work for
the life of the 5.x series.

I don't know where I picked up that idea, but even if we are supporting
80386 for 5.x then I think we should be able to drop it for 6.x.

-- 
Garance Alistair Drosehn            =   gad at gilead.netel.rpi.edu
Senior Systems Programmer           or  gad at freebsd.org
Rensselaer Polytechnic Institute    or  drosih at rpi.edu


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