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Date:      Sun, 29 Nov 2009 16:36:54 -0800
From:      Pyun YongHyeon <pyunyh@gmail.com>
To:        Brett Glass <brett@lariat.net>
Cc:        usb@freebsd.org
Subject:   Re: ASIX USB-to-Ethernet drivers
Message-ID:  <20091130003654.GB1123@michelle.cdnetworks.com>
In-Reply-To: <200911300004.RAA15867@lariat.net>
References:  <200911282040.NAA05930@lariat.net> <20091129212335.GA1128@michelle.cdnetworks.com> <200911300004.RAA15867@lariat.net>

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On Sun, Nov 29, 2009 at 05:03:44PM -0700, Brett Glass wrote:
> At 02:23 PM 11/29/2009, Pyun YongHyeon wrote:
> 
> >I think the large number of interrupts has nothing to do with
> >axe(4). Almost all USB ethernet controllers are poorly designed
> >to save cost so you can't expect reasonable performance from it and
> >you should have fast CPU to copy received frames in a buffer.
> >It's worse than rl(4) controllers.
> 
> Are there any that are better? I have several machines here that I will
> be using as embedded systems. They have one Ethernet interface each,
> and I need some of them to have two. The only other non-USB ports
> on these machines are video and CompactFlash.
> 

If you had redundant mini PCI/PCIe slot I would have recommended
to avoid USB based ethernet controllers.

> I've thought about using VLAN tagging and VLAN switch to double up
> the Ethernet port, but this is quite expensive. So, I need the best USB
> Ethernet I can get.
> 
> I chose the AX88772A because it seems to be a better solution than the
> Davicom DM9601 (which is USB 1.0 only). The AX88178 has more buffer
> space, but I am having trouble finding reasonably priced adapters that
> use it.
> 
> --Brett Glass
> 



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