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

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Message-ID: <20090114005110.GA6814@gondor.apana.org.au>
Date:	Wed, 14 Jan 2009 11:51:10 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	David Miller <davem@...emloft.net>
Cc:	zbr@...emap.net, dada1@...mosbay.com, w@....eu, ben@...s.com,
	jarkao2@...il.com, mingo@...e.hu, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, jens.axboe@...cle.com
Subject: Re: [PATCH] tcp: splice as many packets as possible at once

David Miller <davem@...emloft.net> wrote:
>
> I wish there were some way we could make this code grab and release a
> reference to the SKB data area (I mean skb_shinfo(skb)->dataref) to
> accomplish it's goals.

We can probably do that for spliced data that end up going to
the networking stack again.  However, as splice is generic the
data may be headed to a destination other than the network stack.

In that case to make dataref work we'd need some mechanism
that allows non-network entities to get/drop this ref count.

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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