if_et man page on FreeBSD

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ET(4)			 BSD Kernel Interfaces Manual			 ET(4)

NAME
     et — Agere ET1310 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 et

     Alternatively, to load the driver as a module at boot time, place the
     following line in loader.conf(5):

	   if_et_load="YES"

DESCRIPTION
     The et driver supports PCI Express Ethernet adapters based on the Agere
     ET1310 chip.

     The et driver supports the following media types:

     autoselect	  Enable autoselection of the media types and options.	The
		  user can manually override the autoselected mode by adding
		  media options to the /etc/rc.conf file.

     10baseT/UTP  Set 10Mbps operation.	 The mediaopt option can also be used
		  to select either full-duplex or half-duplex modes.

     100baseTX	  Set 100Mbps (Fast Ethernet) operation.  The mediaopt option
		  can also be used to select either full-duplex or half-duplex
		  modes.

     1000baseT	  Set 1000Mbps (Gigabit Ethernet) operation.  The mediaopt
		  option can only be set to full-duplex mode.

     The et driver supports the following media options:

     full-duplex  Force full-duplex operation.

     half-duplex  Force half-duplex operation.

     Note that the 1000baseT media type is only available if it is supported
     by the adapter.  For more information on configuring this device, see
     ifconfig(8).

TUNABLES
     hw.et.rx_intr_npkts  This value controls how many packets should be
			  received before a receive interrupt is generated.
			  The default value is 32.  It is recommended to set
			  this value above 38 to prevent the host from being
			  livelocked under a high degree of stress.

     hw.et.rx_intr_delay  This value delays the generation of receive inter‐
			  rupts in units of ~4 microseconds.  It is used
			  together with hw.et.rx_intr_npkts to achieve RX
			  interrupt moderation.	 The default value is 20.

     hw.et.tx_intr_nsegs  This value controls how many segments (not packets)
			  should be transmitted before a transmit interrupt is
			  generated.  The default value is 126.	 It is recom‐
			  mended to set this value below 280 to prevent the TX
			  ring from underflowing.

     hw.et.timer	  This value controls how often a timer interrupt
			  should be generated.	It is used together with
			  hw.et.tx_intr_nsegs to achieve TX interrupt modera‐
			  tion.	 The default value is 1000000000 (nanosec‐
			  onds).

SEE ALSO
     arp(4), miibus(4), netintro(4), ng_ether(4), vlan(4), ifconfig(8)

HISTORY
     The et device driver first appeared in DragonFly 1.11.  The first FreeBSD
     release to include it was FreeBSD 8.0.

AUTHORS
     The et driver was written by Sepherosa Ziehau ⟨sepherosa@gmail.com⟩ for
     DragonFly.	 It was ported to FreeBSD by Xin LI ⟨delphij@FreeBSD.org⟩.

BSD				 July 14, 2008				   BSD
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