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Date:      Wed, 17 Sep 2014 10:06:14 +0900
From:      Yonghyeon PYUN <pyunyh@gmail.com>
To:        Jim Thompson <jim@netgate.com>
Cc:        Brett Glass <brett@lariat.net>, questions@freebsd.org, net@freebsd.org
Subject:   Re: jme interface bounces up and down, up and down....
Message-ID:  <20140917010614.GB1102@michelle.fasterthan.com>
In-Reply-To: <27534E06-CC9B-4A4D-8A7A-9C68ECB760BC@netgate.com>
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> <27534E06-CC9B-4A4D-8A7A-9C68ECB760BC@netgate.com>

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On Tue, Sep 16, 2014 at 07:59:18PM -0500, Jim Thompson wrote:
> 
> > On Sep 16, 2014, at 6:53 PM, Brett Glass <brett@lariat.net> wrote:
> > 
> > At 05:27 PM 9/16/2014, Chris Hill wrote:
> > 
> >> On Tue, 16 Sep 2014, Brett Glass wrote:
> >> 
> >>> 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?
> >> 
> >> 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.
> > 
> > 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 
> 
> 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 “works”, but the connection is 100Mbps.   This is likely the reason the "problem didn't seem to occur with the bundled Linux distro.”
> 

I recall the workaround was suggested by the Vendor but I didn't
incorporate it into the driver due to other reasons.  The end
result is the same if users can manually reduce the speed to
100Mbps.



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