netdev - Re: [PATCH v2 net-next 0/3] net: mvmdio: Performance related improvements

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Date: Tue, 5 Dec 2023 04:47:13 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Tobias Waldekranz <tobias@...dekranz.com>
Cc: davem@...emloft.net, kuba@...nel.org, gregory.clement@...tlin.com,
	sebastian.hesselbarth@...il.com, robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH v2 net-next 0/3] net: mvmdio: Performance related
 improvements

On Mon, Dec 04, 2023 at 11:08:08AM +0100, Tobias Waldekranz wrote:
> Observations of the XMDIO bus on a CN9130-based system during a
> firmware download showed a very low bus utilization, which stemmed
> from the 150us (10x the average access time) sleep which would take
> place when the first poll did not succeed.
> 
> With this series in place, bus throughput increases by about 10x,
> multiplied by whatever gain you are able to extract from running the
> MDC at a higher frequency (hardware dependent).
> 
> I would really appreciate it if someone with access to hardware using
> the IRQ driven path could test that out, since I have not been able to
> figure out how to set this up on CN9130.

Hi Tobias

I tested on Kirkwood:

               mdio: mdio-bus@...04 {
                        compatible = "marvell,orion-mdio";
                        #address-cells = <1>;
                        #size-cells = <0>;
                        reg = <0x72004 0x84>;
                        interrupts = <46>;

The link is reported as up, ethtool shows the expected link mode
capabilities, mii-tool dumps look O.K.

Tested-by: Andrew Lunn <andrew@...n.ch>

    Andrew