netdev - Re: [net-next PATCH v3 3/3] net: TCP thin dupack

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Date:	Fri, 12 Feb 2010 06:19:31 -0500
From:	William Allen Simpson <william.allen.simpson@...il.com>
To:	Andreas Petlund <apetlund@...ula.no>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Ilpo Järvinen 
	<ilpo.jarvinen@...sinki.fi>, Eric Dumazet <eric.dumazet@...il.com>,
	Arnd Hannemann <hannemann@...s.rwth-aachen.de>,
	LKML <linux-kernel@...r.kernel.org>, shemminger@...tta.com,
	David Miller <davem@...emloft.net>, damian@....rwth-aachen.de
Subject: Re: [net-next PATCH v3 3/3] net: TCP thin dupack

Last year, I'm pretty sure I was on record as thinking this is *not* a
good idea.  But at least it now requires a sysctl to turn on, and
should default to off.

Also that naming was a bit dicey.  Now the names are more descriptive,
but the "force" is a bit overkill.

How about:
   NET_TCP_FORCE_THIN_LINEAR_DUPACK -> NET_TCP_THIN_LINEAR_DUPACK
   tcp_force_thin_dupack            -> tcp_thin_linear_dupack
   sysctl_tcp_force_thin_dupack     -> sysctl_tcp_thin_linear_dupack


Andreas Petlund wrote:
> diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
> index 28e0296..c5a73ab 100644
> --- a/net/ipv4/tcp_input.c
> +++ b/net/ipv4/tcp_input.c
> @@ -89,6 +89,8 @@ int sysctl_tcp_frto __read_mostly = 2;
>  int sysctl_tcp_frto_response __read_mostly;
>  int sysctl_tcp_nometrics_save __read_mostly;
>  
> +int sysctl_tcp_force_thin_dupack __read_mostly;
> +
>  int sysctl_tcp_moderate_rcvbuf __read_mostly = 1;

Where is the sysctl initialized?

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