I am using version 2.9.38 and when active pppoe server, the maximum that I obtain of troughput between AP and the station is 700kbits. Without pppoe this troughput goes for 4 Mbps.
The pppoe server consumes resources of the wireless interface?
interface pppoe-server>server print
Flags: X - disabled
0 service-name="" interface=wlan2 max-mtu=1492 max-mru=1492
authentication=pap keepalive-timeout=10 one-session-per-host=no
Machine: Pentium IV 2.13 Ghz with 256MB RAM.