[RP-PPPoE] some PPPoe advice would be appreciated..

[Stephan Viljoen]

Hi There,

I've configured a ppp server a while ago which worked rather well
until recently when I've noticed the CPU taking some strain.
The load average: 3.79, 3.95, 3.80  which is a little confusing since
it's a rather beefy server with only about 220 or so active ppp
accounts.  How would I go about troubleshooting the high CPU usage and
what would you guys recommend is the most PPP sessions
I should run on the below hardware ?

Any help or advice would be highly appreciated.

Let's start with the hardware:
2 x Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz (8 core) , total of 16
cores with 32 threats.
64GB RAM
two intel SSD drives

Software

CentOS Linux release 7.3.1611
PPPoE-Server Version 3.11
Authenticating from Radius with a mysql backend.

I'm running three different instances of the server , each instance
for a different network interface , vlan and security name.


 pppoe-server -N 250 -I e3i2.220:ppp -L 10.252.252.254 -S bbiWIRELESS
 pppoe-server -N 250 -I e2i2.707:adsl -L 10.254.254.254 -S bbiADSL -x 1
 pppoe-server -N 250 -I e1i3.202:ppp -T 60 -L 10.253.253.254 -S
poelogin -O /etc/ppp/pppoe-server-options-maun -x 1

### Basic config file.

noipx
mtu 1452
mru 1452
require-pap
ms-dns 168.167.251.210
ms-dns 168.167.251.211
lcp-echo-interval 60
lcp-echo-failure 3
plugin /etc/ppp/plugins/radius.so
plugin /etc/ppp/plugins/radattr.so
radius-config-file /etc/ppp/radius/radiusclient.conf
logfile /var/log/pppd.log

Thanks in advance,