netdev - Re: [PATCH net-next] mlx4: optimize xmit path

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Message-ID: <1411908136.15768.72.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Sun, 28 Sep 2014 05:42:16 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Or Gerlitz <gerlitz.or@...il.com>
Cc:	Alexei Starovoitov <ast@...mgrid.com>,
	"David S. Miller" <davem@...emloft.net>,
	Jesper Dangaard Brouer <brouer@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>,
	John Fastabend <john.r.fastabend@...el.com>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Amir Vadai <amirv@...lanox.com>,
	Or Gerlitz <or.gerlitz@...il.com>
Subject: Re: [PATCH net-next] mlx4: optimize xmit path

On Sat, 2014-09-27 at 15:56 -0700, Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@...gle.com>

>  
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> ---


>  
>  struct mlx4_en_tx_ring {
> +			/* cache line used and dirtied in tx completion
> +			 * (mlx4_en_free_tx_buf())
> +			 */
> +	u32			last_nr_txbb;
> +	u32			cons;
> +
> +			/* cache line used and dirtied in mlx4_en_xmit()
> +			 */
> +	u32			prod ____cacheline_aligned_in_smp;
> +	unsigned long		bytes;
> +	unsigned long		packets;
> +	unsigned long		tx_csum;
> +	struct mlx4_bf		bf;
> +	unsigned long		queue_stopped;
> +	unsigned long		wake_queue;
> +


Hmm, I forgot to move wake_queue in the first cache line.

I also forgot to include <linux/prefetch.h>

I'll send a v2.



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