netdev - Re: [PATCH v3 net-next 08/14] mlx4: use order-0 pages for RX

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Message-ID: <CALzJLG9z_hc4=35e_yToP1j=+QJJ6uaQbvMo9ddmdN1Ar83RbA@mail.gmail.com>
Date:   Thu, 16 Feb 2017 22:49:49 +0200
From:   Saeed Mahameed <saeedm@....mellanox.co.il>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     Tom Herbert <tom@...bertland.com>,
        Tariq Toukan <tariqt@...lanox.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Alexander Duyck <alexander.duyck@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>, Martin KaFai Lau <kafai@...com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Willem de Bruijn <willemb@...gle.com>,
        Brenden Blanco <bblanco@...mgrid.com>,
        Alexei Starovoitov <ast@...nel.org>,
        linux-mm <linux-mm@...ck.org>
Subject: Re: [PATCH v3 net-next 08/14] mlx4: use order-0 pages for RX

On Thu, Feb 16, 2017 at 7:11 PM, Eric Dumazet <edumazet@...gle.com> wrote:
>> You're admitting that Eric's patches improve driver quality,
>> stability, and performance but you're not allowing this in the kernel
>> because "we know what benchmarks our customers are going to run".
>
> Note that I do not particularly care if these patches go in 4.11 or 4.12 really.
>
> I already backported them into our 4.3 based kernel.
>
> I guess that we could at least propose the trivial patch for stable releases,
> since PowerPC arches really need it.
>
> diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
> b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
> index cec59bc264c9ac197048fd7c98bcd5cf25de0efd..0f6d2f3b7d54f51de359d4ccde21f4585e6b7852
> 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
> +++ b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
> @@ -102,7 +102,8 @@
>  /* Use the maximum between 16384 and a single page */
>  #define MLX4_EN_ALLOC_SIZE     PAGE_ALIGN(16384)
>
> -#define MLX4_EN_ALLOC_PREFER_ORDER     PAGE_ALLOC_COSTLY_ORDER
> +#define MLX4_EN_ALLOC_PREFER_ORDER min_t(int, get_order(32768),
>          \
> +                                        PAGE_ALLOC_COSTLY_ORDER)
>
>  /* Receive fragment sizes; we use at most 3 fragments (for 9600 byte MTU
>   * and 4K allocations) */

+1