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Date:      Tue, 16 Sep 2014 19:59:18 -0500
From:      Jim Thompson <jim@netgate.com>
To:        Brett Glass <brett@lariat.net>
Cc:        pyunyh@gmail.com, questions@freebsd.org, net@freebsd.org
Subject:   Re: jme interface bounces up and down, up and down....
Message-ID:  <27534E06-CC9B-4A4D-8A7A-9C68ECB760BC@netgate.com>
In-Reply-To: <201409162353.RAA00829@mail.lariat.net>
References:  <201409141629.KAA29705@mail.lariat.net> <20140915060819.GA967@michelle.fasterthan.com> <201409151447.IAA08325@mail.lariat.net> <20140916083749.GA988@michelle.fasterthan.com> <201409161727.LAA25854@mail.lariat.net> <alpine.BSF.2.00.1409161923050.72457@tripel.monochrome.org> <201409162353.RAA00829@mail.lariat.net>

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> On Sep 16, 2014, at 6:53 PM, Brett Glass <brett@lariat.net> wrote:
>=20
> At 05:27 PM 9/16/2014, Chris Hill wrote:
>=20
>> On Tue, 16 Sep 2014, Brett Glass wrote:
>>=20
>>> So, what is the best solution? I cannot throw out the machine, and
>>> because I am using a VLAN switch to multiplex the port to three LANs
>>> I do not want to reduce the speed to 100 Mbps. Ideas?
>>=20
>> The man page mentioned says that if "the link partner enabled the =
IEEE 802.3az Energy Efficient Ethernet feature, the controller will not =
be able to establish a 1000baseT link." Maybe disable 802.3az on that =
port, if you can. Just a thought.
>=20
> It's a Netgear "green" switch, model GS105E. It has no way to disable =
802.3az.

The linux jmebp-1.0.8.5 driver from the JMicron website=20

ftp://driver.jmicron.com.tw/Ethernet/Linux/jmebp-1.0.8.5.tar.bz

provides a workaround for the issue.  It adds the delay_time module =
parameter, which causes the network card to attempt a fall back to 100 =
mbps after it cannot connect for several seconds (by default 11).  With =
this, link detection =E2=80=9Cworks=E2=80=9D, but the connection is =
100Mbps.   This is likely the reason the "problem didn't seem to occur =
with the bundled Linux distro.=E2=80=9D

Jim







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