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From: Thomas Monjalon <thomas@monjalon.net>
To: Dekel Peled <dekelp@mellanox.com>
Cc: matan@mellanox.com, viacheslavo@mellanox.com,
	rasland@mellanox.com, stable@dpdk.org, dev@dpdk.org
Subject: Re: [dpdk-dev] [dpdk-stable] [PATCH] net/mlx5: fix number of retries for UAR allocation
Date: Wed, 05 Aug 2020 16:14:40 +0200	[thread overview]
Message-ID: <2991040.2UnnyQe84E@thomas> (raw)
In-Reply-To: <70ff61d3d8431aeb73ee5c5c23c87e525dc221ec.1596446316.git.dekelp@mellanox.com>

03/08/2020 11:18, Dekel Peled:
> Previous patch added definition of number of retries for UAR allocation.
> This value is adequate for x86 systems with 4K pages.
> On power9 system with 64K pages the required value is 32.
> This patch updates the defined value from 2 to 32.

What about bigger pages?

> Fixes: a0bfe9d56f74 ("net/mlx5: fix UAR memory mapping type")
> Cc: stable@dpdk.org

No need of stable@dpdk.org because it was introduced in this release.

> Signed-off-by: Dekel Peled <dekelp@mellanox.com>
> Acked-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
> ---
>  drivers/net/mlx5/mlx5_defs.h | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> diff --git a/drivers/net/mlx5/mlx5_defs.h b/drivers/net/mlx5/mlx5_defs.h
> index e5f7acc..c26d5a2 100644
> --- a/drivers/net/mlx5/mlx5_defs.h
> +++ b/drivers/net/mlx5/mlx5_defs.h
> @@ -202,9 +202,7 @@
>   * UAR base address if UAR was not the first object in the UAR page.
>   * It caused the PMD failure and we should try to get another UAR
>   * till we get the first one with non-NULL base address returned.
> - * Should follow the rdma_core internal (not exported) definition
>   */
> -#define MLX5_ALLOC_UAR_RETRY 2
> +#define MLX5_ALLOC_UAR_RETRY 32

It is missing a comment to explain the calculation with 64K page.

  reply	other threads:[~2020-08-05 14:14 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-03  9:18 [dpdk-dev] " Dekel Peled
2020-08-05 14:14 ` Thomas Monjalon [this message]
2020-08-05 14:27   ` [dpdk-dev] [dpdk-stable] " Thomas Monjalon

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