netdev - Re: [net-next 1/9] net/mlx5e: Switch to using napi_build

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Date:   Thu, 16 Feb 2023 15:55:37 +0100
From:   Maciej Fijalkowski <maciej.fijalkowski@...el.com>
To:     Saeed Mahameed <saeed@...nel.org>
CC:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>,
        "Saeed Mahameed" <saeedm@...dia.com>, <netdev@...r.kernel.org>,
        Tariq Toukan <tariqt@...dia.com>, Gal Pressman <gal@...dia.com>
Subject: Re: [net-next 1/9] net/mlx5e: Switch to using napi_build_skb()

On Wed, Feb 15, 2023 at 04:09:10PM -0800, Saeed Mahameed wrote:
> From: Tariq Toukan <tariqt@...dia.com>
> 
> Use napi_build_skb() which uses NAPI percpu caches to obtain
> skbuff_head instead of inplace allocation.
> 
> napi_build_skb() calls napi_skb_cache_get(), which returns a cached
> skb, or allocates a bulk of NAPI_SKB_CACHE_BULK (16) if cache is empty.
> 
> Performance test:
> TCP single stream, single ring, single core, default MTU (1500B).
> 
> Before: 26.5 Gbits/sec
> After:  30.1 Gbits/sec (+13.6%)

Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>

> 
> Signed-off-by: Tariq Toukan <tariqt@...dia.com>
> Reviewed-by: Gal Pressman <gal@...dia.com>
> Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
> ---
>  drivers/net/ethernet/mellanox/mlx5/core/en_rx.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
> index a9473a51edc1..9ac2c7778b5b 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rx.c
> @@ -1556,7 +1556,7 @@ struct sk_buff *mlx5e_build_linear_skb(struct mlx5e_rq *rq, void *va,
>  				       u32 frag_size, u16 headroom,
>  				       u32 cqe_bcnt, u32 metasize)
>  {
> -	struct sk_buff *skb = build_skb(va, frag_size);
> +	struct sk_buff *skb = napi_build_skb(va, frag_size);
>  
>  	if (unlikely(!skb)) {
>  		rq->stats->buff_alloc_err++;
> -- 
> 2.39.1
>