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linux-next/Documentation/networking/s2io.txt
Justin P. Mattock 0ea6e61122 Documentation: update broken web addresses. 
Below you will find an updated version from the original series bunching all patches into one big patch
updating broken web addresses that are located in Documentation/*
Some of the addresses date as far far back as 1995 etc... so searching became a bit difficult,
the best way to deal with these is to use web.archive.org to locate these addresses that are outdated.
Now there are also some addresses pointing to .spec files some are located, but some(after searching
on the companies site)where still no where to be found. In this case I just changed the address
to the company site this way the users can contact the company and they can locate them for the users.

Signed-off-by: Justin P. Mattock <justinmattock@gmail.com>
Signed-off-by: Thomas Weber <weber@corscience.de>
Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Cc: Paulo Marques <pmarques@grupopie.com>
Cc: Randy Dunlap <rdunlap@xenotime.net>
Cc: Michael Neuling <mikey@neuling.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2010-08-04 15:21:40 +02:00

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Release notes for Neterion's (Formerly S2io) Xframe I/II PCI-X 10GbE driver.
Contents
=======
- 1. Introduction
- 2. Identifying the adapter/interface
- 3. Features supported
- 4. Command line parameters
- 5. Performance suggestions
- 6. Available Downloads
1. Introduction:
This Linux driver supports Neterion's Xframe I PCI-X 1.0 and
Xframe II PCI-X 2.0 adapters. It supports several features
such as jumbo frames, MSI/MSI-X, checksum offloads, TSO, UFO and so on.
See below for complete list of features.
All features are supported for both IPv4 and IPv6.
2. Identifying the adapter/interface:
a. Insert the adapter(s) in your system.
b. Build and load driver
# insmod s2io.ko
c. View log messages
# dmesg | tail -40
You will see messages similar to:
eth3: Neterion Xframe I 10GbE adapter (rev 3), Version 2.0.9.1, Intr type INTA
eth4: Neterion Xframe II 10GbE adapter (rev 2), Version 2.0.9.1, Intr type INTA
eth4: Device is on 64 bit 133MHz PCIX(M1) bus
The above messages identify the adapter type(Xframe I/II), adapter revision,
driver version, interface name(eth3, eth4), Interrupt type(INTA, MSI, MSI-X).
In case of Xframe II, the PCI/PCI-X bus width and frequency are displayed
as well.
To associate an interface with a physical adapter use "ethtool -p <ethX>".
The corresponding adapter's LED will blink multiple times.
3. Features supported:
a. Jumbo frames. Xframe I/II supports MTU upto 9600 bytes,
modifiable using ifconfig command.
b. Offloads. Supports checksum offload(TCP/UDP/IP) on transmit
and receive, TSO.
c. Multi-buffer receive mode. Scattering of packet across multiple
buffers. Currently driver supports 2-buffer mode which yields
significant performance improvement on certain platforms(SGI Altix,
IBM xSeries).
d. MSI/MSI-X. Can be enabled on platforms which support this feature
(IA64, Xeon) resulting in noticeable performance improvement(upto 7%
on certain platforms).
e. Statistics. Comprehensive MAC-level and software statistics displayed
using "ethtool -S" option.
f. Multi-FIFO/Ring. Supports up to 8 transmit queues and receive rings,
with multiple steering options.
4. Command line parameters
a. tx_fifo_num
Number of transmit queues
Valid range: 1-8
Default: 1
b. rx_ring_num
Number of receive rings
Valid range: 1-8
Default: 1
c. tx_fifo_len
Size of each transmit queue
Valid range: Total length of all queues should not exceed 8192
Default: 4096
d. rx_ring_sz
Size of each receive ring(in 4K blocks)
Valid range: Limited by memory on system
Default: 30
e. intr_type
Specifies interrupt type. Possible values 0(INTA), 2(MSI-X)
Valid values: 0, 2
Default: 2
5. Performance suggestions
General:
a. Set MTU to maximum(9000 for switch setup, 9600 in back-to-back configuration)
b. Set TCP windows size to optimal value.
For instance, for MTU=1500 a value of 210K has been observed to result in
good performance.
# sysctl -w net.ipv4.tcp_rmem="210000 210000 210000"
# sysctl -w net.ipv4.tcp_wmem="210000 210000 210000"
For MTU=9000, TCP window size of 10 MB is recommended.
# sysctl -w net.ipv4.tcp_rmem="10000000 10000000 10000000"
# sysctl -w net.ipv4.tcp_wmem="10000000 10000000 10000000"
Transmit performance:
a. By default, the driver respects BIOS settings for PCI bus parameters.
However, you may want to experiment with PCI bus parameters
max-split-transactions(MOST) and MMRBC (use setpci command).
A MOST value of 2 has been found optimal for Opterons and 3 for Itanium.
It could be different for your hardware.
Set MMRBC to 4K**.
For example you can set
For opteron
#setpci -d 17d5:* 62=1d
For Itanium
#setpci -d 17d5:* 62=3d
For detailed description of the PCI registers, please see Xframe User Guide.
b. Ensure Transmit Checksum offload is enabled. Use ethtool to set/verify this
parameter.
c. Turn on TSO(using "ethtool -K")
# ethtool -K <ethX> tso on
Receive performance:
a. By default, the driver respects BIOS settings for PCI bus parameters.
However, you may want to set PCI latency timer to 248.
#setpci -d 17d5:* LATENCY_TIMER=f8
For detailed description of the PCI registers, please see Xframe User Guide.
b. Use 2-buffer mode. This results in large performance boost on
certain platforms(eg. SGI Altix, IBM xSeries).
c. Ensure Receive Checksum offload is enabled. Use "ethtool -K ethX" command to
set/verify this option.
d. Enable NAPI feature(in kernel configuration Device Drivers ---> Network
device support ---> Ethernet (10000 Mbit) ---> S2IO 10Gbe Xframe NIC) to
bring down CPU utilization.
** For AMD opteron platforms with 8131 chipset, MMRBC=1 and MOST=1 are
recommended as safe parameters.
For more information, please review the AMD8131 errata at
http://vip.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/
26310_AMD-8131_HyperTransport_PCI-X_Tunnel_Revision_Guide_rev_3_18.pdf
6. Available Downloads
Neterion "s2io" driver in Red Hat and Suse 2.6-based distributions is kept up
to date, also the latest "s2io" code (including support for 2.4 kernels) is
available via "Support" link on the Neterion site: http://www.neterion.com.
For Xframe User Guide (Programming manual), visit ftp site ns1.s2io.com,
user: linuxdocs password: HALdocs
7. Support
For further support please contact either your 10GbE Xframe NIC vendor (IBM,
HP, SGI etc.) or click on the "Support" link on the Neterion site:
http://www.neterion.com.
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