From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: Dropping NETIF_F_SG since no checksum feature.
Date: Tue, 10 Oct 2006 20:50:49 -0700 (PDT)
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From: Roland Dreier <rdreier@cisco.com>
Date: Tue, 10 Oct 2006 20:49:09 -0700

>     David> non-sendfile() paths will generate big packets just fine,
>     David> as long as the application is providing that much data.
> 
> OK, cool.  Will the big packets be non-linear skbs?

If you had SG enabled (and thus checksumming offload too) then yes
you'll get a non-linear SKB.  Otherwise, without SG, you'll get a
fully linear SKB.