[Gllug] Observed speed of gigabit ethernet only about 1/4 or 1/5 of advertised

[Richard Jones]

On Mon, Jul 23, 2007 at 01:03:05PM +0100, James Roberts wrote:
> Richard Jones wrote:
> > On Mon, Jul 23, 2007 at 11:54:08AM +0100, Pete Ryland wrote:
> >> No-one else mentioned it, but check that the cables you're using are
> >> rated for GigE use.  I'd have to check, but I think that means minimum
> >> cat5e (not just cat5) or cat6.
> > 
> > I don't have the cables in front of me right now to check, but they
> > are short patch cables and are probably basic cat5.  My question
> > though: surely if they were operating in a degraded mode they'd fall
> > back to 100 Mbps, rather than the ~200 Mbps observed?
> 
> 100Mbps duplex *is* 200Mbps...

Mmmm, are you sure?  In one direction I'd only expect to see 100 Mbps.
It would be quite unusual to consider both directions summed together
as a measure of bandwidth.

Rich.

-- 
Richard Jones
Red Hat
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