Re: 100 Mbit/s is (a lot) slower than 10 Mbit/s

On Sat, Oct 19, 2002 at 09:08:04PM +0200, Harald Hanche-Olsen wrote:
> I have a Linksys ethernet card in my laptop.  It can to 10 or 100
> Mbit/s.  But when it's in 100 Mbit/s mode, transfers into the laptop
> are lots slower than at 10 Mbit/s, at least as long as the sender is
> on the same local net and has a 100 Mbit/s interface.
> 
> The reason is obvious enough: Snooping on the ethernet traffic
reveals
> that packets are lost, with frequent timeouts and waits for
> retransmissions as a result.  The timeouts are easily visible by
> watching the blinkenlights on the dongle.  I am assuming this is a
> result of the Linksys' puny buffer being overrun, perhaps due to the
> bandwidth from the PCMCIA slot to the CPU not being big enough to
> cope.
:
> PS.  If the ethernet cable or dongle is disconnected for any reason,
> the laptop hangs until I lean on the power button.  Very annoying.

I don't know if this helps or not, but those Linksys cards are funky.
I once tried to connect two of them (in Windows machines) with a
crossover cable, and they went into an auto-sensing death spiral.  They
would go up and down every second or so, with a nice light show on the
dongles.  Even the Linksys website acknowledged this "feature".

Perhaps there is a conflict with an auto-sensing hub/switch at the
office?

Greg



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