mirror of
https://github.com/torvalds/linux.git
synced 2024-11-18 18:11:56 +00:00
008a5b07f1
Remove reference to obsolete ifconfig command. MTU can be changed with ip command instead. Signed-off-by: Stephen Hemminger <stephen@networkplumber.org> Signed-off-by: David S. Miller <davem@davemloft.net>
142 lines
4.8 KiB
Plaintext
142 lines
4.8 KiB
Plaintext
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 up to 9600 bytes,
|
|
modifiable using ip 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(up to 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. Support
|
|
For further support please contact either your 10GbE Xframe NIC vendor (IBM,
|
|
HP, SGI etc.)
|