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

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Message-ID: <20090203132537.GC4639@ff.dom.local>
Date:	Tue, 3 Feb 2009 13:25:37 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Evgeniy Polyakov <zbr@...emap.net>
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

On Tue, Feb 03, 2009 at 04:06:06PM +0300, Evgeniy Polyakov wrote:
> On Tue, Feb 03, 2009 at 12:36:28PM +0000, Jarek Poplawski (jarkao2@...il.com) wrote:
> > I understand NTA could be better than slabs in above-mentioned cases,
> > but I'm not sure you explaind enough your point on solving this
> > zero-copy problem vs. NTA?
> 
> NTA steals pages from the SLAB so we can maintain any reference counter
> logic in them, so linear part of the skb may be not really freed/reused
> until reference counter hits zero.

Now it's clear. So this looks like one of the options considered by
David. Then I wonder about details... It seems some kind of scheduled
browsing for refcounts is needed or is there something better?

Jarek P.
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