про ППП в этой презенташке
PPTP,L2TP and PPPoE on CCR Changes introduced in v6.8:
kernel drivers for ppp, pppoe, pptp, l2tp now are lock-less on transmit & receive
all ppp packets (except discovery packets) now can be handled by multiple cores
MPPE driver now can handle up to 256 out-of-order packets (Previously even single out-of-order packet was dropped)
roughly doubled MPPE driver encryption performance