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82546千兆网卡驱动程序,支持该系列所有芯片

(This parameter is NOT supported on the 82542-based adapter.)
Valid Range:   0-1
Default Value: 1

A value of '1' indicates that the driver should enable IP checksum
offload for received packets (both UDP and TCP) to the adapter hardware.


Speed and Duplex Configuration
==============================

Three keywords are used to control the speed and duplex configuration.
These keywords are Speed, Duplex, and AutoNeg.

If the board uses a fiber interface, these keywords are ignored, and the
fiber interface board only links at 1000 Mbps full-duplex.

For copper-based boards, the keywords interact as follows:

  The default operation is auto-negotiate.  The board advertises all
  supported speed and duplex combinations, and it links at the highest
  common speed and duplex mode IF the link partner is set to auto-negotiate.

  If Speed = 1000, limited auto-negotiation is enabled and only 1000 Mbps
  is advertised (The 1000BaseT spec requires auto-negotiation.)

  If Speed = 10 or 100, then both Speed and Duplex should be set.  Auto-
  negotiation is disabled, and the AutoNeg parameter is ignored.  Partner
  SHOULD also be forced.

The AutoNeg parameter is used when more control is required over the
auto-negotiation process.  It should be used when you wish to control which
speed and duplex combinations are advertised during the auto-negotiation
process.

The parameter may be specified as either a decimal or hexadecimal value as
determined by the bitmap below.

Bit position   7      6      5       4       3      2      1       0
Decimal Value  128    64     32      16      8      4      2       1
Hex value      80     40     20      10      8      4      2       1
Speed (Mbps)   N/A    N/A    1000    N/A     100    100    10      10
Duplex                       Full            Full   Half   Full    Half

Some examples of using AutoNeg:

  modprobe e1000 AutoNeg=0x01 (Restricts autonegotiation to 10 Half)
  modprobe e1000 AutoNeg=1 (Same as above)
  modprobe e1000 AutoNeg=0x02 (Restricts autonegotiation to 10 Full)
  modprobe e1000 AutoNeg=0x03 (Restricts autonegotiation to 10 Half or 10 Full)
  modprobe e1000 AutoNeg=0x04 (Restricts autonegotiation to 100 Half)
  modprobe e1000 AutoNeg=0x05 (Restricts autonegotiation to 10 Half or 100
  Half)
  modprobe e1000 AutoNeg=0x020 (Restricts autonegotiation to 1000 Full)
  modprobe e1000 AutoNeg=32 (Same as above)

Note that when this parameter is used, Speed and Duplex must not be specified.

If the link partner is forced to a specific speed and duplex, then this
parameter should not be used.  Instead, use the Speed and Duplex parameters
previously mentioned to force the adapter to the same speed and duplex.


Additional Configurations
=========================

  Configuring the Driver on Different Distributions
  -------------------------------------------------
  Configuring a network driver to load properly when the system is started
  is distribution dependent.  Typically, the configuration process involves
  adding an alias line to /etc/modules.conf or /etc/modprobe.conf as well
  as editing other system startup scripts and/or configuration files.  Many
  popular Linux distributions ship with tools to make these changes for you.
  To learn the proper way to configure a network device for your system,
  refer to your distribution documentation.  If during this process you are
  asked for the driver or module name, the name for the Linux Base Driver
  for the Intel(R) PRO/1000 Family of Adapters is e1000.

  As an example, if you install the e1000 driver for two PRO/1000 adapters
  (eth0 and eth1) and set the speed and duplex to 10full and 100half, add
  the following to modules.conf or or modprobe.conf:

       alias eth0 e1000
       alias eth1 e1000
       options e1000 Speed=10,100 Duplex=2,1

  Viewing Link Messages
  ---------------------
  Link messages will not be displayed to the console if the distribution is
  restricting system messages.  In order to see network driver link messages
  on your console, set dmesg to eight by entering the following:

       dmesg -n 8

  NOTE: This setting is not saved across reboots.

  Jumbo Frames
  ------------
  Jumbo Frames support is enabled by changing the MTU to a value larger than
  the default of 1500.  Use the ifconfig command to increase the MTU size.
  For example:

       ifconfig eth<x> mtu 9000 up

  This setting is not saved across reboots.  It can be made permanent if
  you add:

       MTU=9000

   to the file /etc/sysconfig/network-scripts/ifcfg-eth<x>.  This example
   applies to the Red Hat distributions; other distributions may store this
   setting in a different location.

  Notes:

  - To enable Jumbo Frames, increase the MTU size on the interface beyond
    1500.

  - The maximum MTU setting for Jumbo Frames is 16110.  This value coincides
    with the maximum Jumbo Frames size of 16128.

  - Using Jumbo Frames at 10 or 100 Mbps may result in poor performance or
    loss of link.

  - Some Intel gigabit adapters that support Jumbo Frames have a frame size
    limit of 9238 bytes, with a corresponding MTU size limit of 9216 bytes.
    The adapters with this limitation are based on the Intel(R) 82571EB,
    82572EI, 82573L and 80003ES2LAN controller.  These correspond to the
    following product names:
     Intel(R) PRO/1000 PT Server Adapter
     Intel(R) PRO/1000 PT Desktop Adapter
     Intel(R) PRO/1000 PT Network Connection
     Intel(R) PRO/1000 PT Dual Port Server Adapter
     Intel(R) PRO/1000 PT Dual Port Network Connection
     Intel(R) PRO/1000 PF Server Adapter
     Intel(R) PRO/1000 PF Network Connection
     Intel(R) PRO/1000 PF Dual Port Server Adapter
     Intel(R) PRO/1000 PB Server Connection
     Intel(R) PRO/1000 PL Network Connection
     Intel(R) PRO/1000 EB Network Connection with I/O Acceleration
     Intel(R) PRO/1000 EB Backplane Connection with I/O Acceleration
     Intel(R) PRO/1000 PT Quad Port Server Adapter

  - Adapters based on the Intel(R) 82542 and 82573V/E controller do not
    support Jumbo Frames. These correspond to the following product names:
     Intel(R) PRO/1000 Gigabit Server Adapter
     Intel(R) PRO/1000 PM Network Connection

  - The following adapters do not support Jumbo Frames:
     Intel(R) 82562V 10/100 Network Connection
     Intel(R) 82566DM Gigabit Network Connection
     Intel(R) 82566DC Gigabit Network Connection
     Intel(R) 82566MM Gigabit Network Connection
     Intel(R) 82566MC Gigabit Network Connection


  Ethtool
  -------
  The driver utilizes the ethtool interface for driver configuration and
  diagnostics, as well as displaying statistical information.  Ethtool
  version 1.6 or later is required for this functionality.

  The latest release of ethtool can be found from
  http://sourceforge.net/projects/gkernel.

  NOTE: Ethtool 1.6 only supports a limited set of ethtool options.  Support
  for a more complete ethtool feature set can be enabled by upgrading
  ethtool to ethtool-1.8.1.

  Enabling Wake on LAN* (WoL)
  ---------------------------
  WoL is configured through the Ethtool* utility.  Ethtool is included with
  all versions of Red Hat after Red Hat 7.2.  For other Linux distributions,
  download and install Ethtool from the following website:
  http://sourceforge.net/projects/gkernel.

  For instructions on enabling WoL with Ethtool, refer to the website listed
  above.

  WoL will be enabled on the system during the next shut down or reboot.
  For this driver version, in order to enable WoL, the e1000 driver must be
  loaded when shutting down or rebooting the system.

  Wake On LAN is only supported on port A for the following devices:
  Intel(R) PRO/1000 PT Dual Port Network Connection
  Intel(R) PRO/1000 PT Dual Port Server Connection
  Intel(R) PRO/1000 PT Dual Port Server Adapter
  Intel(R) PRO/1000 PF Dual Port Server Adapter
  Intel(R) PRO/1000 PT Quad Port Server Adapter 

  NAPI
  ----
  NAPI (Rx polling mode) is supported in the e1000 driver.  NAPI is enabled
  or disabled based on the configuration of the kernel.  To override
  the default, use the following compile-time flags.

  To enable NAPI, compile the driver module, passing in a configuration option:

       make CFLAGS_EXTRA=-DE1000_NAPI install

  To disable NAPI, compile the driver module, passing in a configuration option:

       make CFLAGS_EXTRA=-DE1000_NO_NAPI install

  See www.cyberus.ca/~hadi/usenix-paper.tgz for more information on NAPI.


Known Issues
============

NOTE: For distribution-specific information, see the ldistrib.txt file
      included in the driver tar.

Dropped Receive Packets on Half-duplex 10/100 Networks
------------------------------------------------------
If you have an Intel PCI Express adapter running at 10mbps or 100mbps, half-
duplex, you may observe occasional dropped receive packets.  There are no
workarounds for this problem in this network configuration.  The network must
be updated to operate in full-duplex, and/or 1000mbps only.

Driver Compilation
------------------
When trying to compile the driver by running make install, the following
error may occur:

    "Linux kernel source not configured - missing version.h"

To solve this issue, create the version.h file by going to the Linux source
tree and entering:

    make include/linux/version.h.

Jumbo Frames System Requirement
-------------------------------
Memory allocation failures have been observed on Linux systems with 64 MB
of RAM or less that are running Jumbo Frames.  If you are using Jumbo
Frames, your system may require more than the advertised minimum
requirement of 64 MB of system memory.

Performance Degradation with Jumbo Frames
-----------------------------------------
Degradation in throughput performance may be observed in some Jumbo frames
environments.  If this is observed, increasing the application's socket
buffer size and/or increasing the /proc/sys/net/ipv4/tcp_*mem entry values
may help.  See the specific application manual and
/usr/src/linux*/Documentation/
networking/ip-sysctl.txt for more details.

Jumbo Frames on Foundry BigIron 8000 switch
-------------------------------------------
There is a known issue using Jumbo frames when connected to a Foundry
BigIron 8000 switch.  This is a 3rd party limitation.  If you experience
loss of packets, lower the MTU size.

Allocating Rx Buffers when Using Jumbo Frames 
---------------------------------------------
Allocating Rx buffers when using Jumbo Frames on 2.6.x kernels may fail if 
the available memory is heavily fragmented. This issue may be seen with PCI-X 
adapters or with packet split disabled. This can be reduced or eliminated 
by changing the amount of available memory for receive buffer allocation, by
increasing /proc/sys/vm/min_free_kbytes. 

Multiple Interfaces on Same Ethernet Broadcast Network
------------------------------------------------------
Due to the default ARP behavior on Linux, it is not possible to have
one system on two IP networks in the same Ethernet broadcast domain
(non-partitioned switch) behave as expected.  All Ethernet interfaces
will respond to IP traffic for any IP address assigned to the system.
This results in unbalanced receive traffic.

If you have multiple interfaces in a server, either turn on ARP
filtering by entering:

    echo 1 > /proc/sys/net/ipv4/conf/all/arp_filter
(this only works if your kernel's version is higher than 2.4.5),

NOTE: This setting is not saved across reboots.  The configuration
change can be made permanent by adding the line:
    net.ipv4.conf.all.arp_filter = 1
to the file /etc/sysctl.conf

      or,

install the interfaces in separate broadcast domains (either in
different switches or in a switch partitioned to VLANs).

82541/82547 can't link or are slow to link with some link partners
-----------------------------------------------------------------
There is a known compatibility issue with 82541/82547 and some
low-end switches where the link will not be established, or will
be slow to establish.  In particular, these switches are known to
be incompatible with 82541/82547:

    Planex FXG-08TE
    I-O Data ETG-SH8

To workaround this issue, the driver can be compiled with an override
of the PHY's master/slave setting.  Forcing master or forcing slave
mode will improve time-to-link.

    # make CFLAGS_EXTRA=-DE1000_MASTER_SLAVE=<n>

Where <n> is:

    0 = Hardware default
    1 = Master mode
    2 = Slave mode
    3 = Auto master/slave

Disable rx flow control with ethtool
------------------------------------
In order to disable receive flow control using ethtool, you must turn
off auto-negotiation on the same command line.

For example:

   ethtool -A eth? autoneg off rx off


Support
=======

For general information, go to the Intel support website at:

    http://support.intel.com

or the Intel Wired Networking project hosted by Sourceforge at:

    http://sourceforge.net/projects/e1000

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 [e-mail]


License
=======

This software program is released under the terms of a license agreement 
between you ('Licensee') and Intel. Do not use or load this software or any 
associated materials (collectively, the 'Software') until you have carefully 
read the full terms and conditions of the LICENSE located in this software 
package. By loading or using the Software, you agree to the terms of this 
Agreement. If you do not agree with the terms of this Agreement, do not 
install or use the Software.


Trademarks
==========

Intel, Itanium, and Pentium are trademarks or registered trademarks of
Intel Corporation or its subsidiaries in the United States and other
countries.

* Other names and brands may be claimed as the property of others.