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

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Date: Thu, 10 Aug 2023 08:53:23 +0200
From: Eric Dumazet <edumazet@...gle.com>
To: Tahsin Erdogan <trdgn@...zon.com>
Cc: Willem de Bruijn <willemdebruijn.kernel@...il.com>, Jason Wang <jasowang@...hat.com>, 
	"David S. Miller" <davem@...emloft.net>, 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 Wed, Aug 9, 2023 at 6:48 PM 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>

Reviewed-by: Eric Dumazet <edumazet@...gle.com>

Thanks.