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

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Date: Tue, 05 Dec 2023 08:31:33 +0100
From: Tobias Waldekranz <tobias@...dekranz.com>
To: Andrew Lunn <andrew@...n.ch>
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 tis, dec 05, 2023 at 04:47, Andrew Lunn <andrew@...n.ch> wrote:
> 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>

Very much appreciated Andrew, thank you!