netdev - Re: [PATCH net-next] net: mvneta: avoid possible cache misses in mvneta_rx

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Message-Id: <20200929.181048.2023249117997275289.davem@davemloft.net>
Date:   Tue, 29 Sep 2020 18:10:48 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     lorenzo@...nel.org
Cc:     netdev@...r.kernel.org, brouer@...hat.com,
        lorenzo.bianconi@...hat.com, ilias.apalodimas@...aro.org
Subject: Re: [PATCH net-next] net: mvneta: avoid possible cache misses in
 mvneta_rx_swbm

From: Lorenzo Bianconi <lorenzo@...nel.org>
Date: Tue, 29 Sep 2020 23:58:57 +0200

> Do not use rx_desc pointers if possible since rx descriptors are stored in
> uncached memory and dereferencing rx_desc pointers generate extra loads.
> This patch improves XDP_DROP performance of ~ 110Kpps (700Kpps vs 590Kpps)
> on Marvell Espressobin
> 
> Analyzed-by: Ilias Apalodimas <ilias.apalodimas@...aro.org>
> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>

Applied.