linux-kernel - Re: [PATCH v3] tun: avoid high-order page allocation for packet header

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Message-ID: <a257dfa6333fea0d220d51b17b0512327e115060.camel@amazon.com>
Date:   Wed, 9 Aug 2023 15:01:31 +0000
From:   "Erdogan, Tahsin" <trdgn@...zon.com>
To:     "pabeni@...hat.com" <pabeni@...hat.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        "willemdebruijn.kernel@...il.com" <willemdebruijn.kernel@...il.com>,
        "herbert@...dor.apana.org.au" <herbert@...dor.apana.org.au>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org" <kuba@...nel.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] tun: avoid high-order page allocation for packet
 header

On Wed, 2023-08-09 at 10:01 -0400, Willem de Bruijn wrote:
> Erdogan, Tahsin wrote:
> > On Wed, 2023-08-09 at 09:18 -0400, Willem de Bruijn wrote:
> > > Tun sendmsg is a special case, only used by vhost-net from inside
> > > the
> > > kernel. Arguably consistency with packet_snd/packet_alloc_skb
> > > would
> > > be
> > > more important. That said, this makes sense to me. I assume your
> > > configuring a device with very large MTU?
> > 
> > That's right. I am setting MTU to 9100 in my test.
> 
> Makes sense. That's not even that large.
> 
> Please address the commit message points about virtio_net_hdr.hdr_len
> and write() vs writev().

Yes, I will update commit message in v4. thank you.