From owner-freebsd-performance@FreeBSD.ORG  Sat Nov 25 09:37:35 2006
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Subject: Re: em forwarding performance (was Proposed 6.2 em RELEASE patch
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Divacky Roman wrote:

> hm.. now I am confused. the rule is that having I586_CPU improves
> performance because optimized bzero/bcopy is included (its not
> included if you only have I686_CPU).
> 
> I dont understand why the generic version is used.

I believe the consensus was that I486 line disables it, i.e. to leave
just I586 and I686 in.