netdev - Re: [PATCH net-next] route: fix breakage after moving lwtunnel state

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Message-ID: <CALx6S36+e7O_n+UKvFO89goKoE2QV2EDa5CrzEU9eAoD13e-EQ@mail.gmail.com>
Date:	Thu, 27 Aug 2015 12:47:52 -0700
From:	Tom Herbert <tom@...bertland.com>
To:	Thomas Graf <tgraf@...g.ch>
Cc:	Jiri Benc <jbenc@...hat.com>, David Miller <davem@...emloft.net>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] route: fix breakage after moving lwtunnel state

On Wed, Aug 26, 2015 at 3:13 PM, Thomas Graf <tgraf@...g.ch> wrote:
> On 08/26/15 at 06:19pm, Jiri Benc wrote:
>> might be a noise. However, there's definitely room for performance
>> improvement here, the lwtunnel vxlan throughput is at about ~40% of the
>> non-vxlan throughput. I did not spend too much time on analyzing this, yet,
>> but it's clear the dst_entry layout is not our biggest concern here.
>
> I'm currently working on reducing the overhead for VXLAN and Gre and
> effectively Geneve once Pravin's work is in. The main disadvantage
> of lwt based flow tunneling is the additional fib_lookup() performed
> for each packet. It seems tempting to cache the tunnel endpoint dst in
> the lwt state of the overlay route. It will usually point to the same
> dst for every packet. The cache behaviour if dependant on no fib rules
> are and the route is a single nexthop route.
>
Or set nexthop appropriately. This what we do for ILA. Works great
without any other dst references, but might put to much weight in the
administrator to configure nexthop per encapsulating destination.

Tom

> Did you test with a card that features UDP encapsulation offloads?
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