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

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Message-ID: <20101119091537.5d1fed2e@nehalam>
Date:	Fri, 19 Nov 2010 09:15:37 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	David Miller <davem@...emloft.net>
Cc:	eric.dumazet@...il.com, hagen@...u.net, netdev@...r.kernel.org,
	xiaosuo@...il.com
Subject: Re: [PATCH net-next-2.6] filter: optimize sk_run_filter

On Fri, 19 Nov 2010 09:05:16 -0800 (PST)
David Miller <davem@...emloft.net> wrote:

> 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...

Are 'register' modifiers a no-op on current GCC?
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