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

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Date:   Mon, 14 Nov 2016 11:49:34 +0100
From:   Jerome Brunet <jbrunet@...libre.com>
To:     André Roth <neolynx@...il.com>
Cc:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Johnson Leung <r58129@...escale.com>,
        Giuseppe CAVALLARO <peppe.cavallaro@...com>,
        linux-amlogic@...ts.infradead.org,
        Alexandre Torgue <alexandre.torgue@...com>,
        netdev@...r.kernel.org
Subject: Re: stmmac/RTL8211F/Meson GXBB: TX throughput problems

On Sun, 2016-11-13 at 20:13 +0100, André Roth wrote:
> > 
> > Andre, the 3.14 kernel you are talking, is it this one ? : 
> > https://github.com/hardkernel/linux/tree/odroidc2-3.14.y
> 
> yes
>  
> > 
> > Because in drivers/net/phy/realtek.c, they disable EEE, but
> > also 1000Base-T Full Duplex advertisement ?
> > 
> > +	/* disable 1000m adv*/
> > +	val = phy_read(phydev, 0x9);
> > +	phy_write(phydev, 0x9, val&(~(1<<9)));
> > 
> > If this is the kernel you are running, you should not be able to
> > have
> > ethernet at 1000MB/s ? Or is it in half duplex mode ?
> 
> ethtool shows 1000Mb/s Full-Duplex and the bandwith is around 300Mb/s
> (as measured by scp). kernel version: 3.14.65-73

Andre,

I checked again the kernel at https://github.com/hardkernel/linux/tree/
odroidc2-3.14.y. The version you mention (3.14.65-73) seems to be:
sha1: c75d5f4d1516cdd86d90a9d1c565bb0ed9251036
tag: jenkins-deb s905 kernel-73

In this particular version, both realtek drivers:
- drivers/net/phy/realtek.c
- drivers/amlogic/ethernet/phy/am_realtek.c

have the hack to disable 1000M advertisement. I don't understand how it
possible for you to have 1000Base-T Full Duplex with this, maybe I'm
missing something here ?

If you did compile the kernel yourself, could you check the 2 file
mentioned above ? Just to be sure there was no patch applied at the
last minute, which would not show up in the git history of hardkernel ?

Thx

Jerome

> 
>