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

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Date:	Mon, 27 Jul 2009 09:23:01 -0700
From:	Joe Perches <joe@...ches.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 Mon, 2009-07-27 at 08:26 -0700, 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.

I think the cost of maintaining this is small and the
percentage of users that benefit underestimated.

It does help handsets a trivial amount, which are unlikely
to ever enable decnet or econet.

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

Good advice.


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