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Cheetah Gigabit Adapter
9
Link Parameters
The network card’s link speed, PHY type (physical connection
to the network) and duplex mode can all be set from this page.
However, if the “AutoNegotiate Link Parameters” box is
checked these parameters are automatically determined and
the configuration options greyed out. For most Gigabit
Ethernet devices it is recommended to use Auto-Negotiation to
set the link parameters. (Note that the adapter’s link speed can
only be 1000Mbps and the PHY type is always G/MII.)
Packet Propulsion
The Packet Propulsion configuration option sets the packet-
size threshold at which Propulsion technology is used to burst
packets across the PCI bus. Propulsion increases the
throughput of small packets by coalescing transfers across
the PCI bus. This minimizes host CPU interrupts and bus
arbitrations.
Use the slider control or edit box to set the packet-size
threshold level in bytes (from 0 to 1514, or 9014 if Jumbo
Frames is selected). Packets of sizes below this threshold
use the Propulsion technique, packets above use the normal
scatter-gather method.
There is a trade off between the Packet Propulsion and
scatter-gather methods. Packet Propulsion uses more bus
resources whereas scatter-gather uses more CPU
resources. The optimum setting of the threshold level for a
particular environment depends on various factors, such as