On 7/26/06, Marko Vojinovic <vvmarko@xxxxxxxxxxx> 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@xxxxxxxxx LlamaLand http://netllama.linux-sxs.org
