netdev - Re: stmmac/RTL8211F/Meson GXBB: TX throughput problems

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Date:   Mon, 14 Nov 2016 08:47:22 +0100
From:   Giuseppe CAVALLARO <peppe.cavallaro@...com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>
CC:     Jerome Brunet <jbrunet@...libre.com>,
        André Roth <neolynx@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Johnson Leung <r58129@...escale.com>,
        <linux-amlogic@...ts.infradead.org>, <netdev@...r.kernel.org>,
        <afaerber@...e.de>
Subject: Re: stmmac/RTL8211F/Meson GXBB: TX throughput problems

Hello Martin

On 11/7/2016 6:37 PM, Martin Blumenstingl wrote:
> Hi Peppe,
>
> On Mon, Nov 7, 2016 at 11:59 AM, Giuseppe CAVALLARO
> <peppe.cavallaro@...com> wrote:
>> In the meantime, I will read again the thread just to see if
>> there is something I am missing.
> if you are re-reading this thread: please note that there are two
> devices in discussion here!

many thx for the sum :-)

> Both are using the Amlogic S905 (GXBB) SoC and both are experiencing
> the same issue (Gbit TX issues, RX with Gbit speeds and RX/TX with
> 100Mbit speed are NOT affected):
> - Odroid-C2 (used by Jerome and André Roth)
> - Tronsmart Vega S95 Meta (my device)
>
> The (Gbit TX) problem seems to be gone on the Odroid-C2 with Jerome's
> patch which disables EEE in drivers/net/phy/realtek.c (at least in his
> tests, I don't have that device so I can't verify).
> The same problem still appears on my Tronsmart Vega S95 Meta even with
> the patched PHY driver.

just an doubt, maybe useful, in the past, on GiGa setup I saw similar
problems and it was due to retiming so maybe 2ns could be necessary
(or better granularity via PAD logic if available).

Regards
Peppe

> Unfortunately I don't have a second device to rule out that my
> Tronsmart Vega S95 Meta could be broken (not unlikely, I get DDR
> errors from time to time in u-boot). Maybe Andreas Faerber can test
> ethernet with and without Jerome's patch on one of his Tronsmart
> devices.
>
>
> Regards,
> Martin
>