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

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Date:	Mon, 2 Feb 2009 08:08:55 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	David Miller <davem@...emloft.net>, zbr@...emap.net, 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 Sat, Jan 31, 2009 at 09:16:04AM +1100, Herbert Xu wrote:
> On Fri, Jan 30, 2009 at 01:42:27PM -0800, David Miller wrote:
...
> > Back to real life, I think long term the thing to do is to just do the
> > cached page allocator thing we'll be doing after Jarek's socket page
> > patch is integrated, and for best performance the driver has to
> > receive it's data into pages, only explicitly pulling the ethernet
> > header into the linear area, like NIU does.
> 
> Yes that sounds like the way to go.

Looks like a lot of changes in drivers, plus: would it work with jumbo
frames? I wonder why the linear area can't be allocated as paged, and
freed with put_page() instead of kfree(skb->head) in skb_release_data().

Actually, at least for some time, there could be used both of these
methods (on paged alloc failure) with some ifs in skb_release_data()
and spd_fill_page() (to check if linear_to_page() is needed).

Jarek P.
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