netdev - Re: [PATCH] net: shrink net_device by #ifdef-ing protocol-specific members

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Message-Id: <200907281743.27871.opurdila@ixiacom.com>
Date:	Tue, 28 Jul 2009 17:43:27 +0300
From:	Octavian Purdila <opurdila@...acom.com>
To:	David Miller <davem@...emloft.net>
Cc:	lgrijincu@...acom.com, netdev@...r.kernel.org,
	eric.dumazet@...il.com
Subject: Re: [PATCH] net: shrink net_device by #ifdef-ing protocol-specific members

On Monday 27 July 2009 18:26:44 David Miller wrote:

> From: Lucian Adrian Grijincu <lgrijincu@...acom.com>
> Date: Mon, 27 Jul 2009 18:09:08 +0300
>
> > Some members of net_device are used only by some protocols.
> >
> > If those protocols are not compiled (as modules or linked in) they
> > should not take up space in the structure.
>
> This benefits, at best, %0.000000001 of users of the Linux kernel,
> because every distribution is going to turn on every single option.
>

Not all Linux users are using regular (desktop/server) distributions. Linux is 
used in embedded systems as well and in these case it makes sense to turn off 
ax25/econet/decnet and in some cases even wireless/ipv6.

> If you want to shrink structures, find ways to eliminate or
> shrink structure members in all cases.

We are looking into that as well since we have a pretty aggressive goal (get 
net_device to 450 bytes or so), but we thought of starting with the low 
hanging fruits. 

Any suggestions in this area?

tavi

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