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

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Message-ID: <20090115233205.GA8474@gondor.apana.org.au>
Date:	Fri, 16 Jan 2009 10:32:05 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	David Miller <davem@...emloft.net>
Cc:	w@....eu, jarkao2@...il.com, zbr@...emap.net, 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] tcp: splice as many packets as possible at once

On Thu, Jan 15, 2009 at 03:26:08PM -0800, David Miller wrote:
>
> New patch, this has the SKB clone removal as well:

Thanks Dave!

Something else just came to mind though.

> +static inline struct page *linear_to_page(struct page *page, unsigned int len,
> +					  unsigned int offset)
> +{
> +	struct page *p = alloc_pages(GFP_KERNEL, 0);
> +
> +	if (!p)
> +		return NULL;
> +	memcpy(page_address(p) + offset, page_address(page) + offset, len);

This won't work very well if skb->head is longer than a page.

We'll need to divide it up into individual pages.

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