netdev - Re: [PATCH v4 net-next 08/13] mlx4: add page recycling in receive path

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Date:   Thu, 9 Mar 2017 15:56:09 +0200
From:   Tariq Toukan <tariqt@...lanox.com>
To:     Eric Dumazet <edumazet@...gle.com>,
        "David S . Miller" <davem@...emloft.net>
CC:     netdev <netdev@...r.kernel.org>,
        Tariq Toukan <tariqt@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [PATCH v4 net-next 08/13] mlx4: add page recycling in receive
 path



On 08/03/2017 6:17 PM, Eric Dumazet wrote:
> Same technique than some Intel drivers, for arches where PAGE_SIZE = 4096
>
> In most cases, pages are reused because they were consumed
> before we could loop around the RX ring.
>
> This brings back performance, and is even better,
> a single TCP flow reaches 30Gbit on my hosts.
>
> v2: added full memset() in mlx4_en_free_frag(), as Tariq found it was needed
> if we switch to large MTU, as priv->log_rx_info can dynamically be changed.
>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> ---
>  drivers/net/ethernet/mellanox/mlx4/en_rx.c   | 258 +++++++++------------------
>  drivers/net/ethernet/mellanox/mlx4/mlx4_en.h |   1 -
>  2 files changed, 82 insertions(+), 177 deletions(-)
>
Acked-by: Tariq Toukan <tariqt@...lanox.com>

Thanks.