Linux initcwnd and initrwnd via /etc/sysctl.conf

linuxlinux-kerneltcp-slow-start

Folks,
As we know, the 3.x kernels have higher TCP default connection values, such as initcwnd and initrwnd. For 2.x friends, is there a way to set these in /etc/sysctl.conf instead of the ip route way?

Instead of the following:

sudo ip route change default via 192.168.1.1 dev eth0  proto static initcwnd 10

Is there a way to set the same in /etc/sysctl.conf?

Thanks

Best Answer

Not quite answering the question but in December 2017 support for changing these values was added to systemd-networkd so you can now put this in /etc/systemd/network/*.network to make it persistent:

[Route]
Gateway=_dhcp4
InitialCongestionWindow=10          # initcwnd
InitialAdvertisedReceiveWindow=10   # initrwnd

The Gateway=_dhcp4 line is needed if you want the [Route] section to apply to the gateway supplied via DHCP. Otherwise add the Initial* lines to your existing [Route] section where you manually specify your gateway address.

Related Topic