linux-kernel - Re: [PATCH net-next v3 4/7] bcm63xx_enet: alloc rx skb with NET_IP

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Date:   Wed, 6 Jan 2021 09:06:13 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Sieng Piaw Liew <liew.s.piaw@...il.com>
Cc:     bcm-kernel-feedback-list@...adcom.com, netdev@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v3 4/7] bcm63xx_enet: alloc rx skb with
 NET_IP_ALIGN

On 1/6/21 6:42 AM, Sieng Piaw Liew wrote:
> Use netdev_alloc_skb_ip_align on newer SoCs with integrated switch
> (enetsw) when refilling RX. Increases packet processing performance
> by 30% (with netif_receive_skb_list).
> 
> Non-enetsw SoCs cannot function with the extra pad so continue to use
> the regular netdev_alloc_skb.
> 
> Tested on BCM6328 320 MHz and iperf3 -M 512 to measure packet/sec
> performance.
> 
> Before:
> [ ID] Interval Transfer Bandwidth Retr
> [ 4] 0.00-30.00 sec 120 MBytes 33.7 Mbits/sec 277 sender
> [ 4] 0.00-30.00 sec 120 MBytes 33.5 Mbits/sec receiver
> 
> After (+netif_receive_skb_list):
> [ 4] 0.00-30.00 sec 155 MBytes 43.3 Mbits/sec 354 sender
> [ 4] 0.00-30.00 sec 154 MBytes 43.1 Mbits/sec receiver
> 
> Signed-off-by: Sieng Piaw Liew <liew.s.piaw@...il.com>

Acked-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian