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

Florian Fainelli
2021-01-06T17:07:21Z

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@gmail.com>

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