netdev - Re: [net-next PATCH RFC] mlx4: RX prefetch loop

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Date:	Mon, 11 Jul 2016 09:00:56 -0700
From:	Brenden Blanco <bblanco@...mgrid.com>
To:	Jesper Dangaard Brouer <brouer@...hat.com>
Cc:	netdev@...r.kernel.org, kafai@...com, daniel@...earbox.net,
	tom@...bertland.com, john.fastabend@...il.com,
	gerlitz.or@...il.com, hannes@...essinduktion.org,
	rana.shahot@...il.com, tgraf@...g.ch,
	"David S. Miller" <davem@...emloft.net>, as754m@....com,
	saeedm@...lanox.com, amira@...lanox.com, tzahio@...lanox.com,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [net-next PATCH RFC] mlx4: RX prefetch loop

On Mon, Jul 11, 2016 at 01:09:22PM +0200, Jesper Dangaard Brouer wrote:
[...]
> This patch is based on top of Brenden's patch 11/12, and is mean to
> replace patch 12/12.
> 
> Prefetching is very important for XDP, especially when using a CPU
> without DDIO (here i7-4790K CPU @ 4.00GHz).
> 
> Program xdp1: touching-data and dropping packets:
>  * 11,363,925 pkt/s == no-prefetch
>  * 21,031,096 pkt/s == brenden's-prefetch
>  * 21,062,728 pkt/s == this-prefetch-patch
> 
> Program xdp2: write-data (swap src_dst_mac) TX-bounce out same interface:
>  *  6,726,482 pkt/s == no-prefetch
>  * 10,378,163 pkt/s == brenden's-prefetch
>  * 10,622,350 pkt/s == this-prefetch-patch
> 
I see the same XDP numbers in my setup with this patch as well.

[...]