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

[Saeed Mahameed <saeedm@dev.mellanox.co.il>]

On Thu, Feb 16, 2017 at 7:11 PM, Eric Dumazet <edumazet@google.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

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