netdev - Re: GSO with udp_tunnel_xmit

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Date:	Fri, 6 Nov 2015 16:19:20 +0900
From:	Tom Herbert <tom@...bertland.com>
To:	"Jason A. Donenfeld" <Jason@...c4.com>
Cc:	Jiri Benc <jbenc@...hat.com>, Netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: GSO with udp_tunnel_xmit_skb

On Thu, Nov 5, 2015 at 7:52 PM, Jason A. Donenfeld <Jason@...c4.com> wrote:
> 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.
>
Jason,

Is this about UFO or GSO (in email subject)? UFO should operate
independently encapsulation or inner packet setting.

Tom

> Thanks,
> Jason
>
> [1] http://thread.gmane.org/gmane.linux.network/332194
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