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linux系统的网卡驱动包

               80-4096 for all other supported adapters
Default Value: 256

This value specifies the number of receive buffer descriptors allocated
by the driver.  Increasing this value allows the driver to buffer more
incoming packets, at the expense of increased system memory utilization.

Each descriptor is 16 bytes.  A receive buffer is also allocated for each
descriptor and can be either 2048, 4096, 8192, or 16384 bytes, depending 
on the MTU setting. The maximum MTU size is 16110.

NOTE:  MTU designates the frame size.  It only needs to be set for Jumbo 
       Frames.  Depending on the available system resources, the request 
       for a higher number of receive descriptors may be denied.  In this 
       case, use a lower number.


RxIntDelay
----------
Valid Range:   0-65535 (0=off)
Default Value: 0

This value delays the generation of receive interrupts in units of 1.024
microseconds.  Receive interrupt reduction can improve CPU efficiency if
properly tuned for specific network traffic.  Increasing this value adds
extra latency to frame reception and can end up decreasing the throughput
of TCP traffic.  If the system is reporting dropped receives, this value
may be set too high, causing the driver to run out of available receive
descriptors.

CAUTION:  When setting RxIntDelay to a value other than 0, adapters may
          hang (stop transmitting) under certain network conditions.  If
          this occurs a NETDEV WATCHDOG message is logged in the system
          event log.  In addition, the controller is automatically reset,
          restoring the network connection.  To eliminate the potential
          for the hang ensure that RxIntDelay is set to 0.


RxAbsIntDelay
-------------
(This parameter is supported only on 82540, 82545 and later adapters.)
Valid Range:   0-65535 (0=off)
Default Value: 8

This value, in units of 1.024 microseconds, limits the delay in which a
receive interrupt is generated.  Useful only if RxIntDelay is non-zero,
this value ensures that an interrupt is generated after the initial
packet is received within the set amount of time.  Proper tuning,
along with RxIntDelay, may improve traffic throughput in specific network
conditions.


Speed
-----
(This parameter is supported only on adapters with copper connections.)
Valid Settings: 0, 10, 100, 1000
Default Value:  0 (auto-negotiate at all supported speeds)

Speed forces the line speed to the specified value in megabits per second
(Mbps).  If this parameter is not specified or is set to 0 and the link
partner is set to auto-negotiate, the board will auto-detect the correct
speed.  Duplex should also be set when Speed is set to either 10 or 100.


TxDescriptors
-------------
Valid Range:   80-256 for 82542 and 82543-based adapters
               80-4096 for all other supported adapters
Default Value: 256

This value is the number of transmit descriptors allocated by the driver.
Increasing this value allows the driver to queue more transmits.  Each
descriptor is 16 bytes.

NOTE:  Depending on the available system resources, the request for a
       higher number of transmit descriptors may be denied.  In this case,
       use a lower number.


TxIntDelay
----------
Valid Range:   0-65535 (0=off)
Default Value: 8

This value delays the generation of transmit interrupts in units of
1.024 microseconds.  Transmit interrupt reduction can improve CPU
efficiency if properly tuned for specific network traffic.  If the
system is reporting dropped transmits, this value may be set too high
causing the driver to run out of available transmit descriptors.


TxAbsIntDelay
-------------
(This parameter is supported only on 82540, 82545 and later adapters.)
Valid Range:   0-65535 (0=off)
Default Value: 32

This value, in units of 1.024 microseconds, limits the delay in which a
transmit interrupt is generated.  Useful only if TxIntDelay is non-zero,
this value ensures that an interrupt is generated after the initial
packet is sent on the wire within the set amount of time.  Proper tuning,
along with TxIntDelay, may improve traffic throughput in specific
network conditions.


XsumRX
------
(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.


Copybreak
---------
Valid Range:   0-xxxxxxx (0=off)
Default Value: 256
Usage: insmod e1000.ko copybreak=128

Driver copies all packets below or equaling this size to a fresh rx
buffer before handing it up the stack.

This parameter is different than other parameters, in that it is a
single (not 1,1,1 etc.) parameter applied to all driver instances and
it is also available during runtime at 
/sys/module/e1000/parameters/copybreak


SmartPowerDownEnable
--------------------
Valid Range: 0-1
Default Value:  0 (disabled)

Allows Phy to turn off in lower power states. The user can turn off
this parameter in supported chipsets.


KumeranLockLoss
---------------
Valid Range: 0-1
Default Value: 1 (enabled)

This workaround skips resetting the Phy at shutdown for the initial
silicon releases of ICH8 systems.


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 Gigabit Family of Adapters is e1000.

  As an example, if you install the e1000 driver for two Gigabit 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, 82566, 82562, 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
     Intel(R) PRO/1000 PF Quad Port Server Adapter
     Intel(R) 82566DM-2 Gigabit Network Connection
     Intel(R) Gigabit PT Quad Port Server ExpressModule

  - 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