On Fri, Jun 28, 2013 at 08:05:06AM -0700, Eric Dumazet wrote:

From: Eric Dumazet <edumazet@google.com>

Steinar reported reallocations of skb->head with IPv6, leading to
a warning in skb_try_coalesce()

It turns out iwl3945 has several problems :

1) skb->truesize is underestimated. 
   We really consume PAGE_SIZE bytes for a fragment,
   not the frame length.
2) 128 bytes of initial headroom is a bit low and forces reallocations.
3) We can avoid consuming a full page for small enough frames.

Reported-by: Steinar H. Gunderson <redacted>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Paul Stewart <redacted>

Acked-by: Stanislaw Gruszka <redacted>

FYI, I'll post 4965 version soon.