Date: Wed, 24 May 2000 09:52:04 -0700 (PDT) From: Matthew Dillon <dillon@apollo.backplane.com> To: "Daniel C. Sobral" <dcs@newsguy.com> Cc: Chuck Paterson <cp@bsdi.com>, arch@FreeBSD.ORG Subject: Re: Preemptive kernel on older X86 hardware Message-ID: <200005241652.JAA75843@apollo.backplane.com> References: <200005241446.IAA05589@berserker.bsdi.com> <392BF518.F8170D0E@newsguy.com>
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:> processors might not be required. I'll propose the following as it
:> reduces the work required:
:>
:> Once FreeBSD has a preemptive kernel FreeBSD will only run on
:> Pentium or better X86 processors.
:
:We had a lot of trouble already making people give up on their MFM/RLL
:controllers!
:
:Personally, I think this is the way to go, but not before 6.0. If 5.0
:doesn't work on 486's, there'll be hell to pay.
:
:--
:Daniel C. Sobral (8-DCS)
Woa everyone, before this blows up into an unnecessary flamefest...
Nobody is advocating scrapping the 386 for UP kernels. Even when/if
the kernel becomes threaded, it still probably will not be preemptive
but even if it were we are not going to be throwing cmpexg instructions
in mainline *UP* code. If some of the imported code happens to do that,
it's trivial to fix with #ifdef's for 386/486 support.
For SMP kernels I don't think it's worth supporting either the 386 or
the 486.
-Matt
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