netdev - Re: [PATCH net-next] veth: extend features to support tunneling

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Message-ID: <CAMEtUuwgDpLFMj0DNx+c4QZz573rgmLiNcZOmHgou2A3684Shw@mail.gmail.com>
Date:	Fri, 25 Oct 2013 19:22:23 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>, stephen@...workplumber.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] veth: extend features to support tunneling

On Fri, Oct 25, 2013 at 6:25 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> From: Eric Dumazet <edumazet@...gle.com>
>
> While investigating on a recent vxlan regression, I found veth
> was using a zero features set for vxlan tunnels.

oneliner can be better :)

> We have to segment GSO frames, copy the payload, and do the checksum.
>
> This patch brings a ~200% performance increase
>
> We probably have to add hw_enc_features support
> on other virtual devices.
>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Cc: Alexei Starovoitov <ast@...mgrid.com>
> ---

iperf over veth with gre/vxlan tunneling is now ~4Gbps. 20x gain as advertised.
Thanks!
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