netdev - Re: [PATCH net] ravb: Decrease TxFIFO depth of Q3 and Q2 to one

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Date:   Thu, 07 Mar 2019 09:32:10 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     horms+renesas@...ge.net.au
Cc:     sergei.shtylyov@...entembedded.com, magnus.damm@...il.com,
        netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        wsa+renesas@...g-engineering.com
Subject: Re: [PATCH net] ravb: Decrease TxFIFO depth of Q3 and Q2 to one

From: Simon Horman <horms+renesas@...ge.net.au>
Date: Thu,  7 Mar 2019 11:24:47 +0100

> From: Masaru Nagai <masaru.nagai.vx@...esas.com>
> 
> Hardware has the CBS (Credit Based Shaper) which affects only Q3
> and Q2. When updating the CBS settings, even if the driver does so
> after waiting for Tx DMA finished, there is a possibility that frame
> data still remains in TxFIFO.
> 
> To avoid this, decrease TxFIFO depth of Q3 and Q2 to one.
> 
> This patch has been exercised this using netperf TCP_MAERTS, TCP_STREAM
> and UDP_STREAM tests run on an Ebisu board. No performance change was
> detected, outside of noise in the tests, both in terms of throughput and
> CPU utilisation.
> 
> Fixes: c156633f1353 ("Renesas Ethernet AVB driver proper")
> Signed-off-by: Masaru Nagai <masaru.nagai.vx@...esas.com>
> Signed-off-by: Kazuya Mizuguchi <kazuya.mizuguchi.ks@...esas.com>
> [simon: updated changelog]
> Signed-off-by: Simon Horman <horms+renesas@...ge.net.au>

Applied and queued up for -stable, thanks.