buntgemischtes in schwarz-weiss

Yuchung Cheng from Google with some ideas about how the speed of TCP, the workhorse of the internet, could be increased.

How to edit the initial congestion window in linux (thanks to cdnplanet.com):

Changing initcwnd

Adjusting the value of the initcwnd setting on Linux is simple. Assuming we want to set it to 10:

Step 1: check route settings.

sajal@sajal-desktop:~$ ip route show
192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.100  metric 1 
169.254.0.0/16 dev eth0  scope link  metric 1000 
default via 192.168.1.1 dev eth0  proto static 
sajal@sajal-desktop:~$ 

Make a note of the line starting with default.

Step 2: Change the default settings.
Paste the current settings for default and add initcwnd 10 to it.

sajal@sajal-desktop:~$ sudo ip route change default via 192.168.1.1 dev eth0  proto static initcwnd 10

Step 3: Verify

sajal@sajal-desktop:~$ ip route show
192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.100  metric 1 
169.254.0.0/16 dev eth0  scope link  metric 1000 
default via 192.168.1.1 dev eth0  proto static  initcwnd 10
sajal@sajal-desktop:~$ 

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