netdev - Re: [PATCH net-next-2.6] filter: optimize sk_run

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Message-Id: <20101119.090516.104057453.davem@davemloft.net>
Date:	Fri, 19 Nov 2010 09:05:16 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	hagen@...u.net, netdev@...r.kernel.org, xiaosuo@...il.com
Subject: Re: [PATCH net-next-2.6] filter: optimize sk_run_filter

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 19 Nov 2010 17:55:59 +0100

> Unfortunatly on x86_32 it also chose that f_k was more valuable in a cpu
> register and accumulator A lost its register to get a stack slot
> instead.

Ok that tradeoff is terrible, but it depends upon knowledge we haven't
given to the compiler (yet).

Let me think about this a bit...
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