[lug] NIC Speed

[Tkil]

>>>>> "Tkil" == tkil  <tkil at scrye.com> writes:

Tkil> i find 30% to be a little pessimistic.  for ethernet, i usually
Tkil> plan on 60-70% of rated speed to be available (so, at 100Mbps,
Tkil> i'd expect to see 12.5*.6 = 7.5MBps transfers).

Tkil> of course, i developed this heuristic back in the days of
Tkil> thinnet, so i have no idea how bridges or hubs can affect
Tkil> things.  likewise, that was back on 10mbps, which didn't strain
Tkil> the hosts nearly as much.

but note that this figure (~70%) is backed up by some actual theory
regarding the behavior of the Carrier Sense Multiple Access/Collision
Detect mechanism used by ethernet.  i'm pretty sure that the presence
of switches (in a star topology, as compared to the older bus
topology) does something odd to that theory, however.

t.