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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <68696e92-d056-5f29-9e71-72066f0c7673@st.com>
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
>