2008-07-08 22:51:57 +00:00
|
|
|
|
Linux Base Driver for 10 Gigabit Intel(R) Network Connection
|
|
|
|
|
=============================================================
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
2008-07-08 22:51:57 +00:00
|
|
|
|
October 9, 2007
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Contents
|
|
|
|
|
========
|
|
|
|
|
|
|
|
|
|
- In This Release
|
|
|
|
|
- Identifying Your Adapter
|
2008-07-08 22:51:57 +00:00
|
|
|
|
- Building and Installation
|
2005-04-16 22:20:36 +00:00
|
|
|
|
- Command Line Parameters
|
|
|
|
|
- Improving Performance
|
2008-07-08 22:51:57 +00:00
|
|
|
|
- Additional Configurations
|
|
|
|
|
- Known Issues/Troubleshooting
|
2005-04-16 22:20:36 +00:00
|
|
|
|
- Support
|
|
|
|
|
|
|
|
|
|
|
2008-07-08 22:51:57 +00:00
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
|
In This Release
|
|
|
|
|
===============
|
|
|
|
|
|
2008-07-08 22:51:57 +00:00
|
|
|
|
This file describes the ixgb Linux Base Driver for the 10 Gigabit Intel(R)
|
|
|
|
|
Network Connection. This driver includes support for Itanium(R)2-based
|
|
|
|
|
systems.
|
|
|
|
|
|
|
|
|
|
For questions related to hardware requirements, refer to the documentation
|
|
|
|
|
supplied with your 10 Gigabit adapter. All hardware requirements listed apply
|
|
|
|
|
to use with Linux.
|
|
|
|
|
|
|
|
|
|
The following features are available in this kernel:
|
|
|
|
|
- Native VLANs
|
|
|
|
|
- Channel Bonding (teaming)
|
|
|
|
|
- SNMP
|
|
|
|
|
|
|
|
|
|
Channel Bonding documentation can be found in the Linux kernel source:
|
|
|
|
|
/Documentation/networking/bonding.txt
|
|
|
|
|
|
|
|
|
|
The driver information previously displayed in the /proc filesystem is not
|
|
|
|
|
supported in this release. Alternatively, you can use ethtool (version 1.6
|
|
|
|
|
or later), lspci, and ifconfig to obtain the same information.
|
|
|
|
|
|
|
|
|
|
Instructions on updating ethtool can be found in the section "Additional
|
|
|
|
|
Configurations" later in this document.
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Identifying Your Adapter
|
|
|
|
|
========================
|
|
|
|
|
|
2008-07-08 22:51:57 +00:00
|
|
|
|
The following Intel network adapters are compatible with the drivers in this
|
|
|
|
|
release:
|
|
|
|
|
|
|
|
|
|
Controller Adapter Name Physical Layer
|
|
|
|
|
---------- ------------ --------------
|
|
|
|
|
82597EX Intel(R) PRO/10GbE LR/SR/CX4 10G Base-LR (1310 nm optical fiber)
|
|
|
|
|
Server Adapters 10G Base-SR (850 nm optical fiber)
|
|
|
|
|
10G Base-CX4(twin-axial copper cabling)
|
|
|
|
|
|
|
|
|
|
For more information on how to identify your adapter, go to the Adapter &
|
|
|
|
|
Driver ID Guide at:
|
|
|
|
|
|
|
|
|
|
http://support.intel.com/support/network/sb/CS-012904.htm
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Building and Installation
|
|
|
|
|
=========================
|
|
|
|
|
|
|
|
|
|
select m for "Intel(R) PRO/10GbE support" located at:
|
|
|
|
|
Location:
|
|
|
|
|
-> Device Drivers
|
|
|
|
|
-> Network device support (NETDEVICES [=y])
|
|
|
|
|
-> Ethernet (10000 Mbit) (NETDEV_10000 [=y])
|
|
|
|
|
1. make modules && make modules_install
|
|
|
|
|
|
|
|
|
|
2. Load the module:
|
|
|
|
|
|
|
|
|
|
    modprobe ixgb <parameter>=<value>
|
|
|
|
|
|
|
|
|
|
The insmod command can be used if the full
|
|
|
|
|
path to the driver module is specified. For example:
|
|
|
|
|
|
|
|
|
|
insmod /lib/modules/<KERNEL VERSION>/kernel/drivers/net/ixgb/ixgb.ko
|
|
|
|
|
|
|
|
|
|
With 2.6 based kernels also make sure that older ixgb drivers are
|
|
|
|
|
removed from the kernel, before loading the new module:
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
2008-07-08 22:51:57 +00:00
|
|
|
|
rmmod ixgb; modprobe ixgb
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
2008-07-08 22:51:57 +00:00
|
|
|
|
3. Assign an IP address to the interface by entering the following, where
|
|
|
|
|
x is the interface number:
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
2008-07-08 22:51:57 +00:00
|
|
|
|
ifconfig ethx <IP_address>
|
|
|
|
|
|
|
|
|
|
4. Verify that the interface works. Enter the following, where <IP_address>
|
|
|
|
|
is the IP address for another machine on the same subnet as the interface
|
|
|
|
|
that is being tested:
|
|
|
|
|
|
|
|
|
|
ping <IP_address>
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Command Line Parameters
|
|
|
|
|
=======================
|
|
|
|
|
|
2008-07-08 22:51:57 +00:00
|
|
|
|
If the driver is built as a module, the following optional parameters are
|
|
|
|
|
used by entering them on the command line with the modprobe command using
|
|
|
|
|
this syntax:
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
|
|
modprobe ixgb [<option>=<VAL1>,<VAL2>,...]
|
|
|
|
|
|
2008-07-08 22:51:57 +00:00
|
|
|
|
For example, with two 10GbE PCI adapters, entering:
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
2008-07-08 22:51:57 +00:00
|
|
|
|
modprobe ixgb TxDescriptors=80,128
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
2008-07-08 22:51:57 +00:00
|
|
|
|
loads the ixgb driver with 80 TX resources for the first adapter and 128 TX
|
2005-04-16 22:20:36 +00:00
|
|
|
|
resources for the second adapter.
|
|
|
|
|
|
|
|
|
|
The default value for each parameter is generally the recommended setting,
|
2008-07-08 22:51:57 +00:00
|
|
|
|
unless otherwise noted.
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
|
|
FlowControl
|
|
|
|
|
Valid Range: 0-3 (0=none, 1=Rx only, 2=Tx only, 3=Rx&Tx)
|
|
|
|
|
Default: Read from the EEPROM
|
2008-07-08 22:51:57 +00:00
|
|
|
|
If EEPROM is not detected, default is 1
|
|
|
|
|
This parameter controls the automatic generation(Tx) and response(Rx) to
|
|
|
|
|
Ethernet PAUSE frames. There are hardware bugs associated with enabling
|
|
|
|
|
Tx flow control so beware.
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
|
|
RxDescriptors
|
|
|
|
|
Valid Range: 64-512
|
|
|
|
|
Default Value: 512
|
2008-07-08 22:51:57 +00:00
|
|
|
|
This value is the number of receive descriptors allocated by the driver.
|
|
|
|
|
Increasing this value allows the driver to buffer more incoming packets.
|
|
|
|
|
Each descriptor is 16 bytes. A receive buffer is also allocated for
|
|
|
|
|
each descriptor and can be either 2048, 4056, 8192, or 16384 bytes,
|
|
|
|
|
depending on the MTU setting. When the MTU size is 1500 or less, the
|
2005-04-16 22:20:36 +00:00
|
|
|
|
receive buffer size is 2048 bytes. When the MTU is greater than 1500 the
|
2008-07-08 22:51:57 +00:00
|
|
|
|
receive buffer size will be either 4056, 8192, or 16384 bytes. The
|
2005-04-16 22:20:36 +00:00
|
|
|
|
maximum MTU size is 16114.
|
|
|
|
|
|
|
|
|
|
RxIntDelay
|
|
|
|
|
Valid Range: 0-65535 (0=off)
|
2008-07-08 22:51:57 +00:00
|
|
|
|
Default Value: 72
|
|
|
|
|
This value delays the generation of receive interrupts in units of
|
|
|
|
|
0.8192 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
|
2005-04-16 22:20:36 +00:00
|
|
|
|
run out of available receive descriptors.
|
|
|
|
|
|
|
|
|
|
TxDescriptors
|
|
|
|
|
Valid Range: 64-4096
|
|
|
|
|
Default Value: 256
|
|
|
|
|
This value is the number of transmit descriptors allocated by the driver.
|
2008-07-08 22:51:57 +00:00
|
|
|
|
Increasing this value allows the driver to queue more transmits. Each
|
2005-04-16 22:20:36 +00:00
|
|
|
|
descriptor is 16 bytes.
|
|
|
|
|
|
|
|
|
|
XsumRX
|
|
|
|
|
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.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Improving Performance
|
|
|
|
|
=====================
|
|
|
|
|
|
2008-07-08 22:51:57 +00:00
|
|
|
|
With the 10 Gigabit server adapters, the default Linux configuration will
|
|
|
|
|
very likely limit the total available throughput artificially. There is a set
|
|
|
|
|
of configuration changes that, when applied together, will increase the ability
|
|
|
|
|
of Linux to transmit and receive data. The following enhancements were
|
|
|
|
|
originally acquired from settings published at http://www.spec.org/web99/ for
|
|
|
|
|
various submitted results using Linux.
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
2008-07-08 22:51:57 +00:00
|
|
|
|
NOTE: These changes are only suggestions, and serve as a starting point for
|
|
|
|
|
tuning your network performance.
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
|
|
The changes are made in three major ways, listed in order of greatest effect:
|
2008-07-08 22:51:57 +00:00
|
|
|
|
- Use ifconfig to modify the mtu (maximum transmission unit) and the txqueuelen
|
2005-04-16 22:20:36 +00:00
|
|
|
|
parameter.
|
|
|
|
|
- Use sysctl to modify /proc parameters (essentially kernel tuning)
|
2008-07-08 22:51:57 +00:00
|
|
|
|
- Use setpci to modify the MMRBC field in PCI-X configuration space to increase
|
2005-04-16 22:20:36 +00:00
|
|
|
|
transmit burst lengths on the bus.
|
|
|
|
|
|
2008-07-08 22:51:57 +00:00
|
|
|
|
NOTE: setpci modifies the adapter's configuration registers to allow it to read
|
|
|
|
|
up to 4k bytes at a time (for transmits). However, for some systems the
|
|
|
|
|
behavior after modifying this register may be undefined (possibly errors of
|
|
|
|
|
some kind). A power-cycle, hard reset or explicitly setting the e6 register
|
|
|
|
|
back to 22 (setpci -d 8086:1a48 e6.b=22) may be required to get back to a
|
|
|
|
|
stable configuration.
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
|
|
- COPY these lines and paste them into ixgb_perf.sh:
|
|
|
|
|
#!/bin/bash
|
2008-07-08 22:51:57 +00:00
|
|
|
|
echo "configuring network performance , edit this file to change the interface
|
|
|
|
|
or device ID of 10GbE card"
|
2005-04-16 22:20:36 +00:00
|
|
|
|
# set mmrbc to 4k reads, modify only Intel 10GbE device IDs
|
2008-07-08 22:51:57 +00:00
|
|
|
|
# replace 1a48 with appropriate 10GbE device's ID installed on the system,
|
|
|
|
|
# if needed.
|
|
|
|
|
setpci -d 8086:1a48 e6.b=2e
|
|
|
|
|
# set the MTU (max transmission unit) - it requires your switch and clients
|
|
|
|
|
# to change as well.
|
2005-04-16 22:20:36 +00:00
|
|
|
|
# set the txqueuelen
|
|
|
|
|
# your ixgb adapter should be loaded as eth1 for this to work, change if needed
|
|
|
|
|
ifconfig eth1 mtu 9000 txqueuelen 1000 up
|
2008-07-08 22:51:57 +00:00
|
|
|
|
# call the sysctl utility to modify /proc/sys entries
|
|
|
|
|
sysctl -p ./sysctl_ixgb.conf
|
2005-04-16 22:20:36 +00:00
|
|
|
|
- END ixgb_perf.sh
|
|
|
|
|
|
|
|
|
|
- COPY these lines and paste them into sysctl_ixgb.conf:
|
|
|
|
|
# some of the defaults may be different for your kernel
|
|
|
|
|
# call this file with sysctl -p <this file>
|
|
|
|
|
# these are just suggested values that worked well to increase throughput in
|
|
|
|
|
# several network benchmark tests, your mileage may vary
|
|
|
|
|
|
|
|
|
|
### IPV4 specific settings
|
2008-07-08 22:51:57 +00:00
|
|
|
|
# turn TCP timestamp support off, default 1, reduces CPU use
|
|
|
|
|
net.ipv4.tcp_timestamps = 0
|
|
|
|
|
# turn SACK support off, default on
|
|
|
|
|
# on systems with a VERY fast bus -> memory interface this is the big gainer
|
|
|
|
|
net.ipv4.tcp_sack = 0
|
|
|
|
|
# set min/default/max TCP read buffer, default 4096 87380 174760
|
|
|
|
|
net.ipv4.tcp_rmem = 10000000 10000000 10000000
|
|
|
|
|
# set min/pressure/max TCP write buffer, default 4096 16384 131072
|
|
|
|
|
net.ipv4.tcp_wmem = 10000000 10000000 10000000
|
|
|
|
|
# set min/pressure/max TCP buffer space, default 31744 32256 32768
|
|
|
|
|
net.ipv4.tcp_mem = 10000000 10000000 10000000
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
|
|
### CORE settings (mostly for socket and UDP effect)
|
2008-07-08 22:51:57 +00:00
|
|
|
|
# set maximum receive socket buffer size, default 131071
|
|
|
|
|
net.core.rmem_max = 524287
|
|
|
|
|
# set maximum send socket buffer size, default 131071
|
|
|
|
|
net.core.wmem_max = 524287
|
|
|
|
|
# set default receive socket buffer size, default 65535
|
|
|
|
|
net.core.rmem_default = 524287
|
|
|
|
|
# set default send socket buffer size, default 65535
|
|
|
|
|
net.core.wmem_default = 524287
|
|
|
|
|
# set maximum amount of option memory buffers, default 10240
|
|
|
|
|
net.core.optmem_max = 524287
|
|
|
|
|
# set number of unprocessed input packets before kernel starts dropping them; default 300
|
|
|
|
|
net.core.netdev_max_backlog = 300000
|
2005-04-16 22:20:36 +00:00
|
|
|
|
- END sysctl_ixgb.conf
|
|
|
|
|
|
2008-07-08 22:51:57 +00:00
|
|
|
|
Edit the ixgb_perf.sh script if necessary to change eth1 to whatever interface
|
|
|
|
|
your ixgb driver is using and/or replace '1a48' with appropriate 10GbE device's
|
|
|
|
|
ID installed on the system.
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
2008-07-08 22:51:57 +00:00
|
|
|
|
NOTE: Unless these scripts are added to the boot process, these changes will
|
|
|
|
|
only last only until the next system reboot.
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Resolving Slow UDP Traffic
|
|
|
|
|
--------------------------
|
2008-07-08 22:51:57 +00:00
|
|
|
|
If your server does not seem to be able to receive UDP traffic as fast as it
|
|
|
|
|
can receive TCP traffic, it could be because Linux, by default, does not set
|
|
|
|
|
the network stack buffers as large as they need to be to support high UDP
|
|
|
|
|
transfer rates. One way to alleviate this problem is to allow more memory to
|
|
|
|
|
be used by the IP stack to store incoming data.
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
2008-07-08 22:51:57 +00:00
|
|
|
|
For instance, use the commands:
|
2005-04-16 22:20:36 +00:00
|
|
|
|
sysctl -w net.core.rmem_max=262143
|
|
|
|
|
and
|
|
|
|
|
sysctl -w net.core.rmem_default=262143
|
2008-07-08 22:51:57 +00:00
|
|
|
|
to increase the read buffer memory max and default to 262143 (256k - 1) from
|
|
|
|
|
defaults of max=131071 (128k - 1) and default=65535 (64k - 1). These variables
|
|
|
|
|
will increase the amount of memory used by the network stack for receives, and
|
2005-04-16 22:20:36 +00:00
|
|
|
|
can be increased significantly more if necessary for your application.
|
|
|
|
|
|
2008-07-08 22:51:57 +00:00
|
|
|
|
|
|
|
|
|
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/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 10GbE Family of
|
|
|
|
|
Adapters is ixgb.
|
|
|
|
|
|
|
|
|
|
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
|
|
|
|
|
------------
|
|
|
|
|
The driver supports Jumbo Frames for all adapters. Jumbo Frames support is
|
|
|
|
|
enabled by changing the MTU to a value larger than the default of 1500.
|
|
|
|
|
The maximum value for the MTU is 16114. Use the ifconfig command to
|
|
|
|
|
increase the MTU size. For example:
|
|
|
|
|
|
|
|
|
|
ifconfig ethx mtu 9000 up
|
|
|
|
|
|
|
|
|
|
The maximum MTU setting for Jumbo Frames is 16114. This value coincides
|
|
|
|
|
with the maximum Jumbo Frames size of 16128.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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
|
|
|
|
|
to the latest version.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
NAPI
|
|
|
|
|
----
|
|
|
|
|
|
|
|
|
|
NAPI (Rx polling mode) is supported in the ixgb driver. NAPI is enabled
|
|
|
|
|
or disabled based on the configuration of the kernel. see CONFIG_IXGB_NAPI
|
|
|
|
|
|
|
|
|
|
See www.cyberus.ca/~hadi/usenix-paper.tgz for more information on NAPI.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Known Issues/Troubleshooting
|
|
|
|
|
============================
|
|
|
|
|
|
|
|
|
|
NOTE: After installing the driver, if your Intel Network Connection is not
|
|
|
|
|
working, verify in the "In This Release" section of the readme that you have
|
|
|
|
|
installed the correct driver.
|
|
|
|
|
|
|
|
|
|
Intel(R) PRO/10GbE CX4 Server Adapter Cable Interoperability Issue with
|
|
|
|
|
Fujitsu XENPAK Module in SmartBits Chassis
|
|
|
|
|
---------------------------------------------------------------------
|
|
|
|
|
Excessive CRC errors may be observed if the Intel(R) PRO/10GbE CX4
|
|
|
|
|
Server adapter is connected to a Fujitsu XENPAK CX4 module in a SmartBits
|
|
|
|
|
chassis using 15 m/24AWG cable assemblies manufactured by Fujitsu or Leoni.
|
|
|
|
|
The CRC errors may be received either by the Intel(R) PRO/10GbE CX4
|
|
|
|
|
Server adapter or the SmartBits. If this situation occurs using a different
|
|
|
|
|
cable assembly may resolve the issue.
|
|
|
|
|
|
|
|
|
|
CX4 Server Adapter Cable Interoperability Issues with HP Procurve 3400cl
|
|
|
|
|
Switch Port
|
|
|
|
|
------------------------------------------------------------------------
|
|
|
|
|
Excessive CRC errors may be observed if the Intel(R) PRO/10GbE CX4 Server
|
|
|
|
|
adapter is connected to an HP Procurve 3400cl switch port using short cables
|
|
|
|
|
(1 m or shorter). If this situation occurs, using a longer cable may resolve
|
|
|
|
|
the issue.
|
|
|
|
|
|
|
|
|
|
Excessive CRC errors may be observed using Fujitsu 24AWG cable assemblies that
|
|
|
|
|
Are 10 m or longer or where using a Leoni 15 m/24AWG cable assembly. The CRC
|
|
|
|
|
errors may be received either by the CX4 Server adapter or at the switch. If
|
|
|
|
|
this situation occurs, using a different cable assembly may resolve the issue.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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, do either of the following:
|
|
|
|
|
|
|
|
|
|
- Turn on ARP filtering by entering:
|
|
|
|
|
echo 1 > /proc/sys/net/ipv4/conf/all/arp_filter
|
|
|
|
|
|
|
|
|
|
- Install the interfaces in separate broadcast domains - either in
|
|
|
|
|
different switches or in a switch partitioned to VLANs.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
UDP Stress Test Dropped Packet Issue
|
|
|
|
|
--------------------------------------
|
|
|
|
|
Under small packets UDP stress test with 10GbE driver, the Linux system
|
|
|
|
|
may drop UDP packets due to the fullness of socket buffers. You may want
|
|
|
|
|
to change the driver's Flow Control variables to the minimum value for
|
|
|
|
|
controlling packet reception.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Tx Hangs Possible Under Stress
|
|
|
|
|
------------------------------
|
|
|
|
|
Under stress conditions, if TX hangs occur, turning off TSO
|
|
|
|
|
"ethtool -K eth0 tso off" may resolve the problem.
|
|
|
|
|
|
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
|
Support
|
|
|
|
|
=======
|
|
|
|
|
|
2008-07-08 22:51:57 +00:00
|
|
|
|
For general information, go to the Intel support website at:
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
|
|
http://support.intel.com
|
|
|
|
|
|
2008-07-08 22:51:57 +00:00
|
|
|
|
or the Intel Wired Networking project hosted by Sourceforge at:
|
|
|
|
|
|
|
|
|
|
http://sourceforge.net/projects/e1000
|
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
|
If an issue is identified with the released source code on the supported
|
2008-07-08 22:51:57 +00:00
|
|
|
|
kernel with a supported adapter, email the specific information related
|
|
|
|
|
to the issue to e1000-devel@lists.sf.net
|