netdev - Re: [RFC PATCH] netfilter: remove the duplicate tables

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Message-ID: <1290147847.2489.1.camel@edumazet-laptop>
Date:	Fri, 19 Nov 2010 07:24:07 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Changli Gao <xiaosuo@...il.com>
Cc:	Patrick McHardy <kaber@...sh.net>,
	"David S. Miller" <davem@...emloft.net>,
	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [RFC PATCH] netfilter: remove the duplicate tables

Le vendredi 19 novembre 2010 à 07:36 +0800, Changli Gao a écrit :
> On Thu, Nov 18, 2010 at 11:43 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> > You consume 16 bytes per counter in the main table, while 4 bytes index
> > should be enough on SMP build. Most firewalls I know use two or four
> > cpus at most.
> 
> I think we can't change the structure of ipt_entry, as it is exposed
> to userspace as an ABI. Though there is no need to keep the same
> structure in the kernel space, converting is a big work. :)
> 

We already do that for COMPAT. This is a not a big deal to always use a
converter and make it dependent on userland being 32 or 64 bit.



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