netdev - Re: [PATCH] Add sysctl to set the advertised TCP initial receive window.

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Message-ID: <1260471333.1868.6.camel@Joe-Laptop.home>
Date:	Thu, 10 Dec 2009 10:55:33 -0800
From:	Joe Perches <joe@...ches.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	chavey@...gle.com, davem@...emloft.net, netdev@...r.kernel.org,
	therbert@...gle.com, eric.dumazet@...il.com
Subject: Re: [PATCH] Add sysctl to set the advertised TCP initial receive
 window.

On Thu, 2009-12-10 at 08:57 -0800, Stephen Hemminger wrote:
> You could use the hole in the structure:
>                 snd_wscale : 4, /* Window scaling received from sender  */
>                 rcv_wscale : 4; /* Window scaling to send to receiver   */
> +	u8	init_rcv_wnd;	/* TCP initial receive window in MSS */
> /*      SACKs data      */
>         u8      num_sacks;      /* Number of SACK blocks        

That hole got filled by tcp cookies.

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