netdev - Re: XDP redirect measurements, gotchas and tracepoints

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Date:   Mon, 21 Aug 2017 15:35:42 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     "xdp-newbies@...r.kernel.org" <xdp-newbies@...r.kernel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Daniel Borkmann <borkmann@...earbox.net>,
        Andy Gospodarek <andy@...yhouse.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Paweł Staszewski <pstaszewski@...are.pl>
Subject: Re: XDP redirect measurements, gotchas and tracepoints

On Mon, Aug 21, 2017 at 09:25:06PM +0200, Jesper Dangaard Brouer wrote:
> 
> Third gotcha(3): You got this far, loaded xdp on both interfaces, and
> notice now that (with default setup) you can RX with 14Mpps but only
> TX with 6.9Mpps (and might have 5% idle cycles).  I debugged this via
> perf tracepoint event xdp:xdp_redirect, and found this was due to
> overrunning the xdp TX ring-queue size.

we should probably fix this somehow.
Once tx-ing netdev added to devmap we can enable xdp on it automatically?