[pptp-server] performance tweaks

[Andrew Kohlsmith]

> > I have been able to oops the kernel with PoPToP 1.1.2. The oops seems
> > to happen within pppd_ctrl but I will get you more information next
> > time 'round.

> That would be a kernel issue, not a PoPToP one (although PoPToP might
> also have a problem).

Yeah but remember to get MPPE there is a kernel patch.  I am wondering if it 
isn't in there.

Regards,
Andrew