Date: Sun, 08 Jun 2008 12:01:17 -0400 From: Jon Radel <jon@radel.com> To: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> Cc: "Gelsema, P \(Patrick\) - FreeBSD" <freebsd@superhero.nl>, freebsd questions <freebsd-questions@freebsd.org> Subject: Re: NFE setting manually to 1000baseT and half duplex Message-ID: <484C024D.9070001@radel.com> In-Reply-To: <20080608140911.S40202@wojtek.tensor.gdynia.pl> References: <56297.82.95.198.17.1212870050.squirrel@webmail.superhero.nl> <484BBC23.90505@radel.com> <20080608140911.S40202@wojtek.tensor.gdynia.pl>
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[-- Attachment #1 --]
Wojciech Puchar wrote:
>
>> Even if you do have hardware that supports half-duplex gigabit ethernet
>> on both ends, the need to do carrier extension for any frame shorter
>> than 512 bytes so that CSMA/CD actually works on a reasonable sized
>> cable, does horrible things to your throughput if you've got lots of
>> small frames. (In other words, at gigabit speeds, frames smaller than
>> 512 bytes zip down the wire so quickly that you can no longer reliably
>> detect collisions, so the frames all get padded.) I'm having trouble
>> wrapping my head around any circumstances other than horribly,
>> horribly broken hardware or software where half-duplex would increase
>> your performance over full-duplex.
>
> actually there are no gigabit devices incapable of full-duplex.
I would certainly hope so; I can't see much of a market for gigabit
ethernet devices that can't do full-duplex. (I'm a touch confused,
however, by your phrasing that as if you're rebutting something I wrote.)
--Jon Radel
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