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

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Message-ID: <20090126212130.GA4338@ioremap.net>
Date:	Tue, 27 Jan 2009 00:21:30 +0300
From:	Evgeniy Polyakov <zbr@...emap.net>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	David Miller <davem@...emloft.net>, herbert@...dor.apana.org.au,
	w@....eu, 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

Hi Jarek.

On Mon, Jan 26, 2009 at 08:20:36AM +0000, Jarek Poplawski (jarkao2@...il.com) wrote:
> > 1. Network (tree) allocator
> > http://www.ioremap.net/projects/nta
> 
> I looked at this a bit, but alas I didn't find much for this Herbert's
> idea of payload in fragments/pages. Maybe some kind of API RFC is
> needed before this resurrection?

Basic idea is to steal some (probably a lot) pages from the slab
allocator and put network buffers there without strict need for
power-of-two alignment and possible wraps when we add skb_shared_info at
the end, so that old e1000 driver required order-4 allocations for the
jumbo frames. We can do that in alloc_skb() and friends and put returned
buffers into skb's fraglist and updated reference counters for those
pages; and with additional copy of the network headers into skb->head.

-- 
	Evgeniy Polyakov
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