From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Dumazet <eric.dumazet@gmail.com>
Subject: Re: Modifying the exponential backoff on new connection SYN packets
Date: Tue, 09 Apr 2013 08:12:08 -0700
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On Tue, 2013-04-09 at 06:48 -0700, Eric Dumazet wrote:

> You'll have to change inet_csk_reqsk_queue_prune() in
> net/ipv4/inet_connection_sock.c
> 
> timeo = min(timeout << req->num_timeout, max_rto);
> req->expires = now + timeo; 
> 
> Good luck !

Oh well, this code is for SYNACK retransmits...

For other retransmits, you'll have to take a look in
net/ipv4/tcp_timer.c, around lines 475

icsk->icsk_rto = min(icsk->icsk_rto << 1, TCP_RTO_MAX);