Re: [PATCH v4] tun: avoid high-order page allocation for packet header

[Willem de Bruijn]

Tahsin Erdogan wrote:
> When gso.hdr_len is zero and a packet is transmitted via write() or
> writev(), all payload is treated as header which requires a contiguous
> memory allocation. This allocation request is harder to satisfy, and may
> even fail if there is enough fragmentation.
> 
> Note that sendmsg() code path limits the linear copy length, so this change
> makes write()/writev() and sendmsg() paths more consistent.
> 
> Signed-off-by: Tahsin Erdogan <trdgn@xxxxxxxxxx>

Reviewed-by: Willem de Bruijn <willemb@xxxxxxxxxx>