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

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Message-ID: <20090120110144.GB17004@ff.dom.local>
Date:	Tue, 20 Jan 2009 11:01:44 +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, Jan 20, 2009 at 01:31:22PM +0300, Evgeniy Polyakov wrote:
> On Tue, Jan 20, 2009 at 10:20:53AM +0000, Jarek Poplawski (jarkao2@...il.com) wrote:
> > Good question! Alas I can't check this soon, but if it's really like
> > this, of course this needs some better idea and rework. (BTW, I'd like
> > to prevent here as much as possible some strange activities like 1
> > byte (payload) packets getting full pages without any accounting.)
> 
> I believe approach to meet all our goals is to have own network memory
> allocator, so that each skb could have its payload in the fragments, we
> would not suffer from the heavy fragmentation and power-of-two overhead
> for the larger MTUs, have a reserve for the OOM condition and generally
> do not depend on the main system behaviour.

100% right! But I guess we need this current fix for -stable, and I'm
a bit worried about safety.

> 
> I will resurrect to some point my network allocator to check how things
> go in the modern environment, if no one will beat this idea first :)

I can't see too much beating of ideas around this problem now... I Wish
you luck!

> 
> 1. Network (tree) allocator
> http://www.ioremap.net/projects/nta
> 

Great, I'll try to learn a bit btw.,
Jarek P.
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