netdev - RE: [PATCH 1/2] stmmac: introduce flag to dynamically disable TX offload for rockchip devices

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Date:   Wed, 3 Apr 2019 07:55:25 +0000
From:   Jose Abreu <jose.abreu@...opsys.com>
To:     "Leonidas P. Papadakos" <papadakospan@...il.com>,
        Robin Murphy <robin.murphy@....com>
CC:     Jose Abreu <jose.abreu@...opsys.com>,
        Philipp Tomsich <philipp.tomsich@...obroma-systems.com>,
        Heiko Stübner <heiko@...ech.de>,
        Christoph Müllner 
        <christoph.muellner@...obroma-systems.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Klaus Goger <klaus.goger@...obroma-systems.com>
Subject: RE: [PATCH 1/2] stmmac: introduce flag to dynamically disable TX
 offload for rockchip devices

From: Leonidas P. Papadakos <papadakospan@...il.com>
Date: Tue, Apr 02, 2019 at 23:48:16

> I can confirm that snps,no-pbl-x8, currently set by uboot for the fdt
> basically fixes the tx-checksumming issue.
> I get 700~800 Mbps myself but that might come down to the setup.
> You could say it affects performance slightly, as I saw in a previous 
> email.
> 
> Without the setting The rate consistently drops to 0.
> ethtool reports tx-checksumming is on in both cases
> 
> Pretty cool!
> Does that give you guys an idea on how to tackle it "officially"?
> 
> 
> 

Thank you all for testing !

It's been on my todo list to cook up a patch that limits PBL according to
FIFO size but I didn't manage to have the time yet so for now it would
be better if you fix it by submitting the DT bindings changes.

Thanks,
Jose Miguel Abreu