linux-kernel - Re: [PATCH V4] mlx4_core: allocate ICM memory in page size chunks

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Date:   Tue, 29 May 2018 23:44:35 -0400
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Eric Dumazet <eric.dumazet@...il.com>,
        David Miller <davem@...emloft.net>, qing.huang@...cle.com
Cc:     tariqt@...lanox.com, haakon.bugge@...cle.com,
        yanjun.zhu@...cle.com, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        gi-oh.kim@...fitbricks.com
Subject: Re: [PATCH V4] mlx4_core: allocate ICM memory in page size chunks



On 05/29/2018 11:34 PM, Eric Dumazet wrote:

> I will test :
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx4/icm.c b/drivers/net/ethernet/mellanox/mlx4/icm.c
> index 685337d58276fc91baeeb64387c52985e1bc6dda..4d2a71381acb739585d662175e86caef72338097 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/icm.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/icm.c
> @@ -43,12 +43,13 @@
>  #include "fw.h"
>  
>  /*
> - * We allocate in page size (default 4KB on many archs) chunks to avoid high
> - * order memory allocations in fragmented/high usage memory situation.
> + * We allocate in as big chunks as we can, up to a maximum of 256 KB
> + * per chunk. Note that the chunks are not necessarily in contiguous
> + * physical memory.
>   */
>  enum {
> -       MLX4_ICM_ALLOC_SIZE     = PAGE_SIZE,
> -       MLX4_TABLE_CHUNK_SIZE   = PAGE_SIZE,
> +       MLX4_ICM_ALLOC_SIZE     = 1 << 18,
> +       MLX4_TABLE_CHUNK_SIZE   = 1 << 18
>  };
>  
>  static void mlx4_free_icm_pages(struct mlx4_dev *dev, struct mlx4_icm_chunk *chunk)
> 

And I will add this simple fix, this really should address your initial concern much better.

@@ -99,6 +100,8 @@ static int mlx4_alloc_icm_pages(struct scatterlist *mem, int order,
 {
        struct page *page;
 
+       if (order)
+               gfp_mask |= __GFP_NORETRY;
        page = alloc_pages_node(node, gfp_mask, order);
        if (!page) {
                page = alloc_pages(gfp_mask, order);