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

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Message-ID: <AANLkTikF83kxggqyxoxw0m6L5km3zogPsiV7wVO1jbXy@mail.gmail.com>
Date:	Fri, 19 Nov 2010 20:48:37 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Jan Engelhardt <jengelh@...ozas.de>,
	Patrick McHardy <kaber@...sh.net>,
	"David S. Miller" <davem@...emloft.net>,
	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
	Stephen Hemminger <shemminger@...tta.com>
Subject: Re: [RFC PATCH] netfilter: remove the duplicate tables

On Fri, Nov 19, 2010 at 7:29 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
>
> IMHO, the real problem is not the table duplication. We know that adding
> a level of indirection is going to hurt a lot because of cache misses.
>

Currently, multi-core CPU is common, the cores in a CPU share the
lowest level cache. Duplicate tables use more RAM, and may cause more
pressure of the lowest level cache.

-- 
Regards,
Changli Gao(xiaosuo@...il.com)
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