netdev - Re: [PATCH net-next-2.6] net: pskb_expand

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Message-ID: <20100920121232.GA9931@ff.dom.local>
Date:	Mon, 20 Sep 2010 12:12:32 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next-2.6] net: pskb_expand_head() optimization

On Mon, Sep 20, 2010 at 09:14:25AM +0000, Jarek Poplawski wrote:
> On Mon, Sep 20, 2010 at 11:02:00AM +0200, Eric Dumazet wrote:
> > Le lundi 20 septembre 2010 ?? 07:21 +0000, Jarek Poplawski a écrit :
> > > Btw, I wonder what is the exact reason we can't use only
> > > NET_SKBUFF_DATA_USES_OFFSET?
> > 
> > I see no real reason.
> > 
> > On 32bit arches, it might be faster to manipulate pointers, and not
> > 'base+offset' values.
> 
> The only reason is code readability and maintenance. Did anybody check
> how much faster?

Hmm... I probably misread your reasoning. So, if no real reason,
really, how about turning this NET_SKBUFF_DATA_USES_OFFSET on
unconditionally in net-next, until somebody spots the difference?

Jarek P.
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