netdev - Re: [PATCH net-next] net: sock_rps_record

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Message-ID: <1481120956.4930.7.camel@edumazet-glaptop3.roam.corp.google.com>
Date:   Wed, 07 Dec 2016 06:29:16 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Paolo Abeni <pabeni@...hat.com>
Cc:     David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Willem de Bruijn <willemb@...gle.com>,
        Tom Herbert <tom@...bertland.com>
Subject: Re: [PATCH net-next] net: sock_rps_record_flow() is for connected
 sockets

On Wed, 2016-12-07 at 08:57 +0100, Paolo Abeni wrote:

> We have some experimental patches to implement GRO for plain UDP
> connected sockets, using frag_list to preserve the individual skb len,
> and deliver the packet to user space individually. With that I got
> ~3mpps with a single queue/user space sink - before the recent udp
> improvements. I would like to present these patches on netdev soon (no
> sooner than next week, anyway).
> 

Make sure you handle properly all netfilter helpers :(

Keeping frag_list means you keep one sk_buff per segment, so this really
looks like a legacy UDP server (like a DNS server) wont benefit from
this anyway.