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

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Date:	Fri, 25 Oct 2013 21:13:53 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alexei Starovoitov <ast@...mgrid.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, 2013-10-25 at 19:22 -0700, Alexei Starovoitov wrote:
> 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 :)

Yes, I'll post the gso fix as well, of course ;)

> 
> > 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!

Wow, such a difference might show another bug somewhere else...

Thanks !


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