I486_CPU or I586_CPU in kernel config

b. f. bf1783 at googlemail.com
Tue May 31 19:01:27 UTC 2011

Warren Block wrote:
> On Mon, 30 May 2011, Adam Vande More wrote:
> > Perhaps this is the one you meant?
> >
> > http://lists.freebsd.org/pipermail/freebsd-questions/2009-January/190568.html
> That's the one!  Thanks!
> > Actually the two threads touch on the same subject, and it seems
> > removal of those options is still desirable on newer CPU's.
> sys/i386/i386/support.s is mentioned, but doesn't seem to have anything
> explicitly specific for 586.  There are some i686 entries.
> A test for cpu_class==CPUCLASS_586 in /sys/i386/isa/npx.c is mentioned
> in the thread, but that check isn't in the current code.



There was a discussion about the implications for performance,
although I don't remember when it took place, and whether it was on
the mailing lists or in a PR audit trail.  If you're interested you
can track down the details.


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