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

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Message-ID: <CACGkMEuuEngqX6eKvRLvBm7_gGipVjfbkQ+JaXsE903CEkNfvA@mail.gmail.com>
Date:   Thu, 10 Aug 2023 11:37:35 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Tahsin Erdogan <trdgn@...zon.com>
Cc:     Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] tun: avoid high-order page allocation for packet header

On Thu, Aug 10, 2023 at 12:48 AM Tahsin Erdogan <trdgn@...zon.com> 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@...zon.com>
> ---
> 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@amazon.com/

Acked-by: Jason Wang <jasowang@...hat.com>

Thanks