linux-kernel - Re: [RFC PATCH 02/12] net: infrastructure for hardware time stamping

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Message-Id: <1229414219.18038.241.camel@ecld0pohly>
Date:	Tue, 16 Dec 2008 08:56:59 +0100
From:	Patrick Ohly <patrick.ohly@...el.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"johnstul@...ibm.com" <johnstul@...ibm.com>,
	"linux-api@...r.kernel.org" <linux-api@...r.kernel.org>
Subject: Re: [RFC PATCH 02/12] net: infrastructure for hardware time
	stamping

On Mon, 2008-12-15 at 21:53 +0000, Herbert Xu wrote:
> Patrick Ohly <patrick.ohly@...el.com> wrote:
> > @@ -305,6 +406,8 @@ struct sk_buff {
> >                                ipvs_property:1,
> >                                peeked:1,
> >                                nf_trace:1;
> > +       /* not all of the bits in optional are used */
> > +       __u8                    optional;
> >        __be16                  protocol;
> 
> You do reliase that this is going to grow the sk_buff by at least
> 4 bytes and not 1?

Yes. I should have been more explicit about that when talking about
"adding one byte". At least it's better than adding 8 bytes of
additional data, as in the previous patch.

I haven't checked it, but was told that sk_buff is already tightly
packed. It didn't look like there was a better place to put the byte
either.

-- 
Best Regards, Patrick Ohly

The content of this message is my personal opinion only and although
I am an employee of Intel, the statements I make here in no way
represent Intel's position on the issue, nor am I authorized to speak
on behalf of Intel on this matter.

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