netdev - Re: [net-next PATCH v4 2/3] net: TCP thin linear timeouts

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Date:	Thu, 18 Feb 2010 10:41:57 +0200 (EET)
From:	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
To:	apetlund@...ula.no
cc:	Netdev <netdev@...r.kernel.org>, eric.dumazet@...il.com,
	hannemann@...s.rwth-aachen.de, LKML <linux-kernel@...r.kernel.org>,
	shemminger@...tta.com, william.allen.simpson@...il.com,
	damian@....rwth-aachen.de, ebiederm@...ssion.com,
	David Miller <davem@...emloft.net>
Subject: Re: [net-next PATCH v4 2/3] net: TCP thin linear timeouts

On Wed, 17 Feb 2010, David Miller wrote:

> From: Andreas Petlund <apetlund@...ula.no>
> Date: Tue, 16 Feb 2010 15:40:41 +0100
> 
> > @@ -341,6 +342,8 @@ struct tcp_sock {
> >  	u16	advmss;		/* Advertised MSS			*/
> >  	u8	frto_counter;	/* Number of new acks after RTO */
> >  	u8	nonagle;	/* Disable Nagle algorithm?             */
> > +	u8      thin_lto    : 1,/* Use linear timeouts for thin streams */
> > +		thin_undef  : 7;
> >  
> 
> There is now a gap of 3 unused bytes here in this critical
> core TCP socket data structure.
> 
> Please either find a way to avoid this hole, or document
> it with a comment.

There would be multiple bits free for use in both frto_counter and nonagle 
byte.

-- 
 i.
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