Sysctl

Linix config for fast 1 Gbps connections

See current config

sysctl -a

/etc/sysctl.conf

#marti: https://fasterdata.es.net/host-tuning/linux/
# allow testing with buffers up to 32MB
net.core.rmem_max = 33554432
net.core.wmem_max = 33554432
# increase Linux autotuning TCP buffer limit to 16MB
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_wmem = 4096 65536 16777216
# recommended default congestion control is htcp   (enlloc de la per defecte cubic)
net.ipv4.tcp_congestion_control=htcp
# recommended for hosts with jumbo frames enabled
net.ipv4.tcp_mtu_probing=1
net.ipv4.tcp_slow_start_after_idle=0
# crec que ja esta activat per defecte:
net.ipv4.tcp_sack=1

Explanation of the different congestion control algorithms: http://androidmodguide.blogspot.de/p/tcp-algorithms.html

Apply changes

sysctl -p

Check speed of internet connection (no root needed)

wget https://raw.githubusercontent.com/sivel/speedtest-cli/master/speedtest.py
chmod a+rx speedtest.py
./speedtest.py