netdev - Re: [PATCH, take2] netfilter : struct xt_table

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Message-ID: <474292D0.7000603@trash.net>
Date:	Tue, 20 Nov 2007 08:54:56 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Simon Horman <horms@...ge.net.au>
CC:	Eric Dumazet <dada1@...mosbay.com>,
	"David S. Miller" <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Netfilter Development Mailinglist 
	<netfilter-devel@...ts.netfilter.org>
Subject: Re: [PATCH, take2] netfilter : struct xt_table_info diet

Simon Horman wrote:
> From: Eric Dumazet <dada1@...mosbay.com>
>
> Instead of using a big array of NR_CPUS entries, we can compute the size
> needed at runtime, using nr_cpu_ids
>
> This should save some ram (especially on David's machines where NR_CPUS=4096 :
> 32 KB can be saved per table, and 64KB for dynamically allocated ones (because
> of slab/slub alignements) )
>
> In particular, the 'bootstrap' tables are not any more static (in data
> section) but on stack as their size is now very small.
>
> This also should reduce the size used on stack in compat functions
> (get_info() declares an automatic variable, that could be bigger than kernel
> stack size for big NR_CPUS)

This seems to be identical to the patch I already got queued
apart from reintroducing the NR_CPUS check. Am I missing
something?

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