Simple patch: Make DFLTPHYS an option

[phk at phk.freebsd.dk (Poul-Henning Kamp)]

In message <20040103_(_dot_)_153644_(_dot_)_107852018_(_dot_)_imp_(_at_)_bsdimp_(_dot_)_com>, "M. Warner Losh" writes:

>The folks on IRC cautioned that this is not for the feign of heart,
>since there's 'issues' with physio, MAXPHYS, etc.
>
>Comments?

We need to get MAXPHYS into the megabyte range eventually.

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Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
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