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Performance Tuning

Optimizing AthenaBNG for high-scale deployments.

Session Scaling​

Increase VLAN Interface Limits​

demux:
  max_interfaces: 100000  # Default: 50000
  creation_rate_limit: 500  # Default: 100

Tune Cleanup Parameters​

demux:
  idle_timeout: 7200  # Increase for longer idle sessions

CAKE QoS Tuning​

Adjust RTT Estimate​

qos:
  overhead_profiles:
    pppoe_ethernet:
      overhead: 34
      mpu: 64
      rtt: 50ms  # Increase for high-latency networks

Disable ACK Filter for Low-Latency​

tc qdisc change dev ppp0 root cake \
  bandwidth 100Mbit \
  rtt 5ms \
  no-ack-filter

RADIUS Optimization​

Connection Pooling​

Configure multiple RADIUS servers for load balancing:

radius:
  servers:
    - host: "10.255.0.10"
      port: 1812
    - host: "10.255.0.11"
      port: 1812

Increase Timeout for Slow Networks​

radius:
  timeout: 5  # seconds
  retries: 3

Network Tuning​

Increase Socket Buffer Sizes​

sudo sysctl -w net.core.rmem_max=134217728
sudo sysctl -w net.core.wmem_max=134217728
sudo sysctl -w net.ipv4.tcp_rmem="4096 87380 67108864"
sudo sysctl -w net.ipv4.tcp_wmem="4096 65536 67108864"

Increase File Descriptor Limits​

sudo sysctl -w fs.file-max=2097152

Tune TCP Parameters​

sudo sysctl -w net.ipv4.tcp_tw_reuse=1
sudo sysctl -w net.ipv4.tcp_fin_timeout=30

Kernel Tuning​

Disable VLAN Offload​

sudo ethtool -K eth1 rxvlan off txvlan off

Enable Hardware Offload (if supported)​

sudo ethtool -K eth1 tso on gso on
sudo sysctl -w net.core.netlink_max_socket_size=16777216

Monitoring Performance​

Check CPU Usage​

top -p $(pgrep -f abngd)

Check Memory Usage​

ps aux | grep abngd | grep -v grep

Check Network Throughput​

iftop -i eth1

Check CAKE Stats​

tc -s qdisc show

Scaling Guidelines​

SessionsCPU CoresMemoryNotes
1,00012GBDevelopment/testing
10,00024GBSmall ISP
50,00048GBMedium ISP
100,000+8+16GB+Large ISP

Next Steps​