tree 2c28d339e72c2629bcc8ecb31c07a789b609ce97
parent f84e6a1ce4e90f629fb0cbbc0fe419c6a84072a3
author JP Abgrall <jpa@google.com> 1391827210 -0800
committer Dmitry Shmidt <dimitrysh@google.com> 1484861554 -0800

ANDROID: tcp: add a sysctl to config the tcp_default_init_rwnd

The default initial rwnd is hardcoded to 10.

Now we allow it to be controlled via
  /proc/sys/net/ipv4/tcp_default_init_rwnd
which limits the values from 3 to 100

This is somewhat needed because ipv6 routes are
autoconfigured by the kernel.

See "An Argument for Increasing TCP's Initial Congestion Window"
in https://developers.google.com/speed/articles/tcp_initcwnd_paper.pdf

Change-Id: I386b2a9d62de0ebe05c1ebe1b4bd91b314af5c54
Signed-off-by: JP Abgrall <jpa@google.com>

Conflicts:
	net/ipv4/sysctl_net_ipv4.c
	net/ipv4/tcp_input.c