[RP-PPPoE] Very high CPU usage by the pppoe-server

[Dardan Behluli]

Hi,

One of our several PPPoE servers has very high CPU usage. This occurs basically when the number of users terminated reaches 1300 - 1500. With more than 1500 users connected the server is practically inaccessible. When we do top we see that the process pppoe-server uses most of the CPU. The parameters of the pppoe-server are: pppoe-server -k -u -r -s -I -C Name -L local_IP -R remote_IP -N 3000.

The difference in the configuration between this and the other PPPoE servers is that this one is not doing NAT, the RADIUS is giving public IP addresses to the clients connected to this NAS.

We tried with mss clamping, synchronous ppp etc but it didn't help much.

We would very much appreciate any insight on this issue.

Thanks in advance,
Dardan Behluli,
Ipko