From 72fc8653dc090a65c330ffd7bf3e7dda1271ffe0 Mon Sep 17 00:00:00 2001 From: JP Abgrall Date: Fri, 7 Feb 2014 18:40:10 -0800 Subject: 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 Conflicts: net/ipv4/sysctl_net_ipv4.c net/ipv4/tcp_input.c --- net/ipv4/tcp_input.c | 1 + 1 file changed, 1 insertion(+) (limited to 'net/ipv4/tcp_input.c') diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index d4c51158470f..da34f830f4bc 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -102,6 +102,7 @@ int sysctl_tcp_thin_dupack __read_mostly; int sysctl_tcp_moderate_rcvbuf __read_mostly = 1; int sysctl_tcp_early_retrans __read_mostly = 3; int sysctl_tcp_invalid_ratelimit __read_mostly = HZ/2; +int sysctl_tcp_default_init_rwnd __read_mostly = TCP_INIT_CWND * 2; #define FLAG_DATA 0x01 /* Incoming frame contained data. */ #define FLAG_WIN_UPDATE 0x02 /* Incoming ACK was a window update. */ -- cgit v1.2.3