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

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Date:	Tue, 03 Feb 2009 16:46:30 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	zbr@...emap.net, jarkao2@...il.com, 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

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Tue, 3 Feb 2009 22:24:31 +1100

> Not necessarily.  Even if the hardware can only DMA into contiguous
> memory, we can always allocate a sufficient number of contiguous
> buffers initially, and then always copy them into fragmented skbs
> at receive time.  This way the contiguous buffers are never
> depleted.
> 
> Granted copying sucks, but this is really because the underlying
> hardware is badly designed.  Also copying is way better than
> not receiving at all due to memory fragmentation.

This scheme sounds very reasonable.
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