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

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Date:   Wed, 07 Dec 2016 06:26:31 -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:
> On Tue, 2016-12-06 at 22:47 -0800, Eric Dumazet wrote:
> > On Tue, 2016-12-06 at 19:32 -0800, Eric Dumazet wrote:
> > > A follow up patch will provide a static_key (Jump Label) since most
> > > hosts do not even use RFS.
> > 
> > Speaking of static_key, it appears we now have GRO on UDP, and this
> > consumes a considerable amount of cpu cycles.
> > 
> > Turning off GRO allows me to get +20 % more packets on my single UDP
> > socket. (1.2 Mpps instead of 1.0 Mpps)
> 
> I see also an improvement for single flow tests disabling GRO, but on a
> smaller scale (~5% if I recall correctly).

Was it on a NUMA host ?

My tests are spreading packets on 8 RX queues, 50/50 split on two NUMA
nodes.