DragonFly On-Line Manual Pages

ET(4)                 DragonFly Kernel Interfaces Manual                 ET(4)

NAME
     et -- Agere ET1310 10/100/Gigabit Ethernet device

SYNOPSIS
     device miibus
     device et

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

           if_et_load="YES"

DESCRIPTION
     The et driver supports the PCIe Ethernet adapters based on Agere ET1310.

     Support for Jumbo Frames is provided via the interface MTU setting.
     Selecting an MTU larger than 1500 bytes with the ifconfig(8) utility
     configures the adapter to receive and transmit Jumbo Frames.  The maximum
     MTU setting for Jumbo Frames is 15572.  This value coincides with the
     maximum Jumbo Frames size of 15594.

     The et driver supports the following media types:

     autoselect   Enable autoselection of the media types and options

     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 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 129.  It is recommended to set
                          this value above 38 to prevent host from being
                          livelocked under a high degree of stress.

     hw.et.rx_intr_delay  This value delays the generation of receive
                          interrupts in units of ~4 microseconds.  It is used
                          together with hw.et.rx_intr_npkts to achieve RX
                          interrupt moderation.  The default value is 25.

     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 256.  It is
                          recommended to set this value below 280 to prevent
                          TX ring from underflow.

     hw.et.timer          This value controls how often the a timer interrupt
                          should be generated.  It is used together with
                          hw.et.tx_intr_nsegs to achieve TX interrupt
                          moderation.  The default value is 1000000000
                          (nanoseconds).

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

HISTORY
     The et device driver first appeared in DragonFly 1.11.

AUTHORS
     The et driver was written by Sepherosa Ziehau <sepherosa@gmail.com>.

DragonFly 5.5                    July 9, 2008                    DragonFly 5.5