linux-kernel - GSO with udp_tunnel_xmit

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Date:	Thu, 5 Nov 2015 11:52:06 +0100
From:	"Jason A. Donenfeld" <Jason@...c4.com>
To:	jbenc@...hat.com, therbert@...gle.com
Cc:	Netdev <netdev@...r.kernel.org>, linux-kernel@...r.kernel.org
Subject: GSO with udp_tunnel_xmit_skb

Hi folks,

When sending arbitrary SKBs with udp_tunnel_xmit_skb, the networking
stack does not appear to be utilizing UFO on the outgoing UDP packets,
which significantly caps the transmission speed. I see about 50% CPU
usage in this send path, triggered for every single outgoing packet.
Is there a particular skb option I need to set to enable this? I read
Tom's patch [1] from last year, but this seems to be about setting the
inner packet type. In my case, the inner type is opaque encrypted
data, so there's not a relevant setting.

Thanks,
Jason

[1] http://thread.gmane.org/gmane.linux.network/332194
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