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NFE(4)		      DragonFly Kernel Interfaces Manual		NFE(4)

NAME

nfe -- NVIDIA nForce MCP 10/100/Gigabit Ethernet driver

SYNOPSIS

To compile this driver into the kernel, place the following lines in your kernel configuration file: device miibus device nfe Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5): if_nfe_load="YES"

DESCRIPTION

The nfe driver supports PCI Ethernet adapters based on the NVIDIA nForce Media and Communications Processors (MCP), such as the nForce, nForce 2, nForce 3, CK804, MCP04, MCP51, MCP55, MCP61, MCP65, MCP67, MCP73, MCP77 and MCP79 Ethernet controller chips. The nfe driver supports the following media types: autoselect Enable autoselection of the media type and options. 10baseT Set 10Mbps operation. 100baseTX Set 100Mbps (Fast Ethernet) operation. 1000baseT Set 1000Mbps (Gigabit Ethernet) operation (recent models only). MIB Variables and Loader Tunables The following per-interface variables are implemented in the hw.nfeX branch of the sysctl(3) MIB. Loader tunables with the same names, but using the prefix hw.nfe are also implemented, they apply to all nfe interfaces in system and can be set in loader.conf(5). imtimer Interrupt moderation time (unit: microseconds). The default value is -125. A value of 0 means disabled. A negative value, -Y, means hardware timer simulated inter- rupt moderation, the simulated interrupt moderation timer will be set to Y. A positive valye, Y, means hardware timer only interrupt moderation, hardware timer will be set to Y. Value can be tuned when the interface is run- ning. Positive values in the range 64-128 seems to be a reasonable. rx_ring_count RX ring count. sysctl node is read-only. The default value is 128. With heavier interrupt moderation (eg. imtimer=-250), it is recommended to increase rx_ring_count (eg. to 512). tx_ring_count TX ring count. sysctl node is read-only. The default value is 256. For more information on configuring this device, see ifconfig(8). The nfe driver supports polling(4).

SEE ALSO

arp(4), ifmedia(4), intro(4), miibus(4), netintro(4), pci(4), polling(4), vlan(4), loader.conf(5), ifconfig(8)

HISTORY

The nfe device driver first appeared in OpenBSD 3.9 and was imported into DragonFly 1.7.

AUTHORS

The nfe driver was written by Jonathan Gray <jsg@openbsd.org> and Damien Bergamini <damien@openbsd.org>. It was ported to DragonFly by Sepherosa Ziehau <sepherosa@gmail.com>.

CAVEATS

NVIDIA refuse to release any documentation on their products. DragonFly 3.7 July 12, 2008 DragonFly 3.7