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

[Jason Wang]

On Thu, Aug 10, 2023 at 12:48 AM Tahsin Erdogan <trdgn@xxxxxxxxxx> 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>
> ---
> v4: updated commit message address comments from Willem
> v3: rebase to latest net-next
> v2: replace linear == 0 with !linear
> v1: https://lore.kernel.org/all/20230726030936.1587269-1-trdgn@xxxxxxxxxx/

Acked-by: Jason Wang <jasowang@xxxxxxxxxx>

Thanks