stmmac/RTL8211F/Meson GXBB: TX throughput problems

Giuseppe CAVALLARO peppe.cavallaro at
Sun Nov 13 23:47:22 PST 2016

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 at> 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).


> 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

More information about the linux-amlogic mailing list