netdev - Re: [PATCH net-next] net: lantiq

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Date:   Wed, 13 Jul 2022 00:23:37 +0200
From:   Hauke Mehrtens <hauke@...ke-m.de>
To:     Aleksander Jan Bajkowski <olek2@...pl>, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] net: lantiq_xrx200: use skb cache

On 7/12/22 20:14, Aleksander Jan Bajkowski wrote:
> napi_build_skb() reuses NAPI skbuff_head cache in order to save some
> cycles on freeing/allocating skbuff_heads on every new Rx or completed
> Tx.
> Use napi_consume_skb() to feed the cache with skbuff_heads of completed
> Tx. The budget parameter is added to indicate NAPI context, as a value
> of zero can be passed in the case of netpoll.
> 
> NAT performance results on BT Home Hub 5A (kernel 5.15.45, mtu 1500):
> 
> Fast path (Software Flow Offload):
> 	Up	Down
> Before	702.4	719.3
> After	707.3	739.9
> 
> Slow path:
> 	Up	Down
> Before	91.8	184.1
> After	92.0	185.7
> 
> Signed-off-by: Aleksander Jan Bajkowski <olek2@...pl>

Acked-by: Hauke Mehrtens <hauke@...ke-m.de>