Asus A8V NIC issues

[Lonni J Friedman]

On 7/26/06, Marko Vojinovic <vvmarko at panet.co.yu> wrote:
> On Tuesday 25 July 2006 20:25, Matt wrote:
> > I recently updated my FC5 from an old A7S333 board to and A8V board
> > This board now has a 10/100/1000 NIC card on the MB.  I have noticed
> > however after upgrading my switch to a 10/1000 D-link, I can not achieve
> > 1000Mbit speeds on my network.
>
> Just note that using a switch increases the number of hops for each packet.
> AFAIK (somebody correct me if I am wrong, please), the declared speed of
> 1 Gbps is the speed at which data travels through the ethernet cable. This
> means that if you have a topology
>
> FC -x- Win         (the -x- denoting the crossover ethernet cable)
>
> you have (approximately) 1Gbps throughput, but if you have the topology
>
> FC --- switch --- Win    (the --- denoting the ordinary ethernet cable)
>
> there are two hops, so each packet goes from FC to switch at 1Gbps, and then
> from switch to Win at 1Gbps, so the travel time gets duplicated, and
> consequently you end up with only 0.5 Gbps, effectively. And if you add yet
> another switch in between, the effective speed becomes 0.3 Gbps, and so
> forth.
>
> I do not say that this is the cause of your problem, just that you should
> account for the topology when measuring ethernet speed.
>
> Best regards, :-)
> Marko
>
> P.S. I am by no means an expert on this, and might be totally wrong. This is
> just the way I explained my own set of measurements to myself...

Sorry, but that's wrong.  If what you stated was true, then the
effectiveness of using a switch in any environment would be negated,
and not only for Gb ethernet.


-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
L. Friedman                                    netllama at gmail.com
LlamaLand                       http://netllama.linux-sxs.org