netdev - Re: Generating fragmented skb

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Message-ID: <1383764517.1520.16.camel@bwh-desktop.uk.level5networks.com>
Date:	Wed, 6 Nov 2013 19:01:57 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	David Laight <David.Laight@...LAB.COM>
CC:	<netdev@...r.kernel.org>
Subject: Re: Generating fragmented skb

On Wed, 2013-11-06 at 12:31 +0000, David Laight wrote:
> What is the easiest way to generate fragmented skb?
[...]

TCP usually generates fragmented skbs when the output device supports
them, separating the payload (may be transmitted multiple times, not
modified by the stack) from the headers (regenerated by the stack for
each transmission).  For small sends this is no longer the case.

You can use sendfile() to control fragmentation from userland.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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