Skip site navigation (1)Skip section navigation (2)

FreeBSD Man Pages

Man Page or Keyword Search:
Man Architecture
Apropos Keyword Search (all sections) Output format
home | help
EM(4)                  FreeBSD Kernel Interfaces Manual                  EM(4)

NAME
     em - Intel(R) PRO/1000 gigabit ethernet driver for the FreeBSD operating
     system

SYNOPSIS
     device em

DESCRIPTION
     The em driver provides support for PCI gigabit ethernet adapters based on
     the Intel 82542, 82543 and 82544 ethernet controller chip.  The driver
     supports Transmit/Receive checksum offload and jumbo frames only on 82543
     and 82544-based adapters.  For a list of supported adapters, see the
     README included with the driver.

     For questions related to hardware requirements, refer to the
     documentation supplied with your Intel PRO/1000 adapter.  All hardware
     requirements listed apply to use with FreeBSD.

     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 size for jumbo frames is 9000.

     The em driver supports the following media types:

     autoselect       Enables auto-negotiation for speed and duplex.

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

     100baseTX        Sets 100Mbps operation.  The mediaopt option can also be
                      used to select either full-duplex or half-duplex modes.

     1000baseSX       Sets 1000Mbps operation.  Only full-duplex mode is
                      supported at this speed.

     1000baseTX       Sets 1000Mbps operation.  Only full-duplex mode is
                      supported at this speed.

     The em driver supports the following media options:

     full-duplex      Forces full duplex operation

     half-duplex      Forces half duplex operation.

     For more information on configuring this device, see ifconfig(8).

DIAGNOSTICS
     em%d: Unable to allocate bus resource: memory  A fatal initialization
     error has occurred.

     em%d: Unable to allocate bus resource: interrupt  A fatal initialization
     error has occurred.

     em%d: No memory for jumbo buffers!  The driver failed to allocate memory
     for jumbo frames during initialization.

     em%d: watchdog timeout -- resetting  The device has stopped responding to
     the network, or there is a problem with the network connection (cable).

SUPPORT
     For additional information regarding building and installation, see the
     README included with the driver.  For general information and support, go
     to the Intel support Website at http://support.intel.com.

     If an issue is identified with the released source code on the supported
     kernel with a supported adapter, email the specific information related
     to the issue to <freebsdnic@mailbox.intel.com>.

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

HISTORY
     The em device driver first appeared in FreeBSD 4.5.

AUTHORS
     The em driver was written by Intel Corporation
     <freebsdnic@mailbox.intel.com>.

FreeBSD 11.0-PRERELEASE        December 8, 2001        FreeBSD 11.0-PRERELEASE

NAME | SYNOPSIS | DESCRIPTION | DIAGNOSTICS | SUPPORT | SEE ALSO | HISTORY | AUTHORS

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=em&sektion=4&manpath=FreeBSD+4.5-RELEASE>

home | help