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

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Message-ID: <20090203115313.GA9018@gondor.apana.org.au>
Date:	Tue, 3 Feb 2009 22:53:13 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Evgeniy Polyakov <zbr@...emap.net>
Cc:	Jarek Poplawski <jarkao2@...il.com>,
	David Miller <davem@...emloft.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 Tue, Feb 03, 2009 at 02:49:44PM +0300, Evgeniy Polyakov wrote:
> How many such preallocated frames is enough? Does it enough to have all
> sockets recv buffer sizes divided by the MTU size? Or just some of them,
> or... That will work but there are way too many corner cases.

Easy, the driver is already allocating them right now so we don't
have to change a thing :)

All we have to do is change the refill mechanism to always allocate
a replacement skb in the rx path, and if that fails, allocate a
fragmented skb instead and copy the received data into it so that
the contiguous skb can be reused.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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