netdev - Re: Increasing TCP initial cwnd

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Message-ID: <alpine.DEB.2.00.0910261553180.19761@wel-95.cs.helsinki.fi>
Date:	Mon, 26 Oct 2009 15:54:13 +0200 (EET)
From:	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
To:	Yair Gottdenker <yairgott@...il.com>
cc:	Netdev <netdev@...r.kernel.org>
Subject: Re: Increasing TCP initial cwnd

On Mon, 26 Oct 2009, Yair Gottdenker wrote:

> I am working on research project to control the sender initial
> congestion window size. I am trying to allow user space to set the
> initial congestion window size but with no luck. The sender always
> sends just 4 packets disregarding from the snd_cwnd.
> 
> I am working on kernel version 2.6.31.3.
> 
> I made the following changes:
> 1. tcp_ipv4.c -> in function tcp_v4_init_sock, changed from
> tp->snd_cwnd = 2 to tp->snd_cwnd = user_space_initial_cwnd.
> 2. tcp_output.c -> tcp_init_cwnd - to always return user_space_initial_cwnd.
> 3. tcp_cong.c -> tcp_slow_start- to always return user_space_initial_cwnd.
> 
> Any help will be more than welcome.

How about trying tcp_init_metrics in tcp_input.c?

-- 
 i.
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