netdev - Re: [PATCH net-next v2 1/3] net: ethernet: fec: Replace interrupt driven MDIO with polled IO

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Message-ID: <CAOMZO5ADZ3JaR_=Wvso+9zX7H4xafowz4L_dTUyRAw2ma-X6BA@mail.gmail.com>
Date:   Sat, 18 Apr 2020 13:21:15 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Fugang Duan <fugang.duan@....com>,
        Chris Heally <cphealy@...il.com>
Subject: Re: [PATCH net-next v2 1/3] net: ethernet: fec: Replace interrupt
 driven MDIO with polled IO

On Fri, Apr 17, 2020 at 9:06 PM Andrew Lunn <andrew@...n.ch> wrote:
>
> Measurements of the MDIO bus have shown that driving the MDIO bus
> using interrupts is slow. Back to back MDIO transactions take about
> 90uS, with 25uS spent performing the transaction, and the remainder of

Nit: please use 's' instead of 'S' for seconds.