From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Fri, 24 Sep 2010 18:19:37 +0200

quoted text
> SOCK_MIN_RCVBUF current value is 256 bytes
> 
> It doesnt permit to receive the smallest possible frame, considering
> socket sk_rmem_alloc/sk_rcvbuf account skb truesizes. On 64bit arches,
> sizeof(struct sk_buff) is 240 bytes. Add the typical 64 bytes of
> headroom, and we go over the limit.
> 
> With old kernels and 32bit arches, we were under the limit, if netdriver
> was doing copybreak.
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>

Fair enough, applied, thanks Eric.
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