netdev - Re: [PATCH v2 net-next RFC] Generic XDP

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Message-ID: <20170410213025.GC4730@C02RW35GFVH8.dhcp.broadcom.net>
Date:   Mon, 10 Apr 2017 17:30:25 -0400
From:   Andy Gospodarek <andy@...yhouse.net>
To:     David Miller <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, xdp-newbies@...r.kernel.org
Subject: Re: [PATCH v2 net-next RFC] Generic XDP

On Mon, Apr 10, 2017 at 03:28:54PM -0400, David Miller wrote:
> From: Andy Gospodarek <andy@...yhouse.net>
> Date: Mon, 10 Apr 2017 14:39:35 -0400
> 
> > As promised, I did some testing today with bnxt_en's implementation
> > of XDP and this one.
> 
> Thanks a lot Andy, obviously the patch needs some more work.
> 
> I noticed GRO stuff in your profile, and Alexei mentioned this earlier
> today.  We probably should elide GRO if generic XDP is attached, since
> in particular this makes the skb_linearize() really expensive.

Good catch -- I actually thought we were disabling GRO automatically and it
looks like we are not.  :-/  I'll send Michael a patch.  

Disabling GRO allows me to process an additional 1Mpps, so I'm up to 7.5Mpps
with this patch.