linux-kernel - Re: [PATCH v2] tcp: splice as many packets as possible at once

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Message-Id: <20090130.141531.56578757.davem@davemloft.net>
Date:	Fri, 30 Jan 2009 14:15:31 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	w@....eu
Cc:	jarkao2@...il.com, zbr@...emap.net, herbert@...dor.apana.org.au,
	dada1@...mosbay.com, ben@...s.com, mingo@...e.hu,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	jens.axboe@...cle.com
Subject: Re: [PATCH v2] tcp: splice as many packets as possible at once

From: Willy Tarreau <w@....eu>
Date: Fri, 30 Jan 2009 23:13:46 +0100

> On Fri, Jan 30, 2009 at 02:03:46PM -0800, David Miller wrote:
> > Any NIC, even the dumbest ones, can be made to receive into pages.
> 
> OK I thought that it was not always easy to split between headers
> and payload. I know that myri10ge can be configured to receive into
> either skbs or pages, but I was not sure about the real implications
> behind that.

For a dumb NIC you wouldn't split, you'd receive directly, the
entire packet, into part of a page.

Then right befire you give it to the stack, you pull the ethernet
header from the page into the linear area.
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