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Message-Id: <1238194447.5516.374.camel@flash> Date: 27 Mar 2009 14:54:08 -0800 From: Ramkrishna Vepa <ram.vepa@...erion.com> To: David Miller <davem@...emloft.net> Cc: Netdev <netdev@...r.kernel.org>, Ramkrishna Vepa <ram.vepa@...erion.com> Subject: [net-2.6 PATCH 1/9] Neterion: Driver help file - vxge driver help text file. - Changes in this submission - - Removed tx/rx_pause, exec_mode, tx_steering_type, rx_steering_type, gro, intr_type, rx & tx max_indicate_pkts and exec_mode loadable parameters. The driver default settings work well in most if not all cases. Another patch to configure these parameters with ethtool will be released in the future - Reported by Stephen Hemminger. - Changes in the last submission - - Incorporated following fixes based on comments from Ben Hutchings Removed references to earlier kernel versions. Removed sections that are similar for all drivers - Load/Unload Identifying the adapter/interface Boot time configuration Removed loadable parameter - NAPI - Napi is always enabled. rx_steering_type & ring_blocks - The driver default settings work well in most if not all cases. Another patch to configure these parameters with ethtool will be released in the future. Removed ethtool support section - No need to duplicate ethtool docs here. Removed Known Issue on SUSE 9 - Doesn't apply when using a current kernel. Removed Common Problems section - These don't apply to in-tree modules. Removed Available Downloads section - Not sure this belongs in-tree. Removed Copyright information - This notice doesn't belong in the kernel. Signed-off-by: Sivakumar Subramani <sivakumar.subramani@...erion.com> Signed-off-by: Rastapur Santosh <santosh.rastapur@...erion.com> Signed-off-by: Ramkrishna Vepa <ram.vepa@...erion.com> --- diff -urpN org/Documentation/networking/vxge.txt patch_1/Documentation/networking/vxge.txt --- org/Documentation/networking/vxge.txt 1969-12-31 16:00:00.000000000 -0800 +++ patch_1/Documentation/networking/vxge.txt 2009-03-27 00:35:00.000000000 -0700 @@ -0,0 +1,199 @@ +Release notes for Neterion's (Formerly S2io) X3100 Linux Driver. + +contents +-------- + +1) Introduction +2) Features supported +3) Configurable driver parameters +4) Performance Suggestions +5) Transmit performance +6) Receive performance +7) Troubleshooting + +1) Introduction: +---------------- +Linux Driver for Neterion 10 Gigabit Ethernet PCI Express I/O Virtualized Server Adapter + + * This driver supports all Neterion's X3100 10GbE adapters. + * Supports several features such as jumbo frames, MSI-X, checksum offloads, TSO, GRO and so on. +(See below for complete list of features supported for both IPv4 and IPv6) + +2) Features supported: +---------------------- + +i) I/O Virtualization Offloads: + - Single function mode + - Multi function mode + +ii) PCI-SIG's I/O Virtualization: + - Single Root mode: v1.0 + - Multi-Root mode: v1.0 + +iii) Jumbo frames: + X3100 Series supports MTU up to 9600 bytes, modifiable using + ifconfig command. + +iv) Offloads supported: + Checksum offload (TCP/UDP/IP) on transmit and receive paths + TCP Segmentation Offload (TSO) on transmit path + Generic Receive Offload (GRO) on receive path + +v) MSI-X: + Can be enabled on platforms which support it, resulting in noticeable + performance improvement (up to 7% on certain platforms). + +vi) NAPI: + For better Rx interrupt moderation. + +vii) RTH (Receive Traffic Hash): + Receive side steering for better scaling. + +viii) Statistics: + Comprehensive MAC-level and software statistics displayed using + "ethtool -S" option. + +ix) Multi-Vpaths: + Up to 17 hardware based transmit and receive data channels, with + multiple steering options. + + +3) Configurable driver parameters: +---------------------------------- + +i) max_config_dev + Specifies maximum device functions to be enabled. + Valid range: 1-8 + +ii) max_config_port: + Specifies number of ports to be enabled. + Valid range: 0,1 + Default: 1 + +iii) max_config_vpath: + Specifies maximum VPATH(s) configured for each device function. + Valid range: 1-17 + +iv) vlan_tag_strip + Enables/disables vlan tag stripping from all received tagged frames that + are not replicated at the internal L2 switch. + Valid range: 0,1 (disabled, enabled respectively) + Default: 1 + +v) addr_learn_en + Enable learning the mac address of the guest OS interface in + virtualization environment. + Valid range: 0,1 (disabled, enabled respectively) + Default: 0 + +4) Performance Suggestions: +--------------------------- + +- Set MTU to maximum - 9000 for switch setup, 9600 for back-to-back. +For MTU 1500: +------------- +### IPV4 specific settings +# turns TCP timestamp support off, default 1, reduces CPU use +$sysctl -w net.ipv4.tcp_timestamps = "0" +# turn SACK support off, default on +$sysctl -w net.ipv4.tcp_sack="0" +# on systems with a VERY fast bus -> memory interface this is the big gainer +# sets min/default/max TCP read buffer, default 4096 87380 174760 +$sysctl -w net.ipv4.tcp_rmem="210000 210000 210000" +# sets min/pressure/max TCP write buffer, default 4096 16384 131072 +$sysctl -w net.ipv4.tcp_wmem="210000 210000 210000" +# sets min/pressure/max TCP buffer space, default 31744 32256 32768 +$sysctl -w net.ipv4.tcp_mem="210000 210000 210000" + +### CORE settings (mostly for socket and UDP effect) +# maximum receive socket buffer size, default 131071 +$sysctl -w net.core.rmem_max="524287" +# maximum send socket buffer size, default 131071 +$sysctl -w net.core.wmem_max="524287" +# default receive socket buffer size, default 65535 +$sysctl -w net.core.rmem_default="524287" +# default send socket buffer size, default 65535 +$sysctl -w net.core.wmem_default="524287" +# maximum amount of option memory buffers, default 10240 +$sysctl -w net.core.optmem_max="524287" +# number of unprocessed input packets before kernel starts dropping them, default 300 +$sysctl -w net.core.netdev_max_backlog="300000" + +For MTU 9000: +------------- +### IPV4 specific settings +# turns TCP timestamp support off, default 1, reduces CPU use +$sysctl -w net.ipv4.tcp_timestamps = "0" +# turn SACK support off, default on +$sysctl -w net.ipv4.tcp_sack="0" +# on systems with a VERY fast bus -> memory interface this is the big gainer +# sets min/default/max TCP read buffer, default 4096 87380 174760 +$sysctl -w net.ipv4.tcp_rmem="10000000 10000000 10000000" +# sets min/pressure/max TCP write buffer, default 4096 16384 131072 +$sysctl -w net.ipv4.tcp_wmem="10000000 10000000 10000000" +# sets min/pressure/max TCP buffer space, default 31744 32256 32768 +$sysctl -w net.ipv4.tcp_mem="10000000 10000000 10000000" + +### CORE settings (mostly for socket and UDP effect) +# maximum receive socket buffer size, default 131071 +$sysctl -w net.core.rmem_max="524287" +# maximum send socket buffer size, default 131071 +$sysctl -w net.core.wmem_max="524287" +# default receive socket buffer size, default 65535 +$sysctl -w net.core.rmem_default="524287" +# default send socket buffer size, default 65535 +$sysctl -w net.core.wmem_default="524287" +# maximum amount of option memory buffers, default 10240 +$sysctl -w net.core.optmem_max="524287" +# number of unprocessed input packets before kernel starts dropping them, default 300 +$sysctl -w net.core.netdev_max_backlog="300000" + +5) Transmit performance: +------------------------ + +- Ensure Transmit Checksum offload and TSO are enabled. + Use ethtool to verify/set these parameters. + + # ethtool -k eth# + Offload parameters for eth0: + rx-checksumming: on + tx-checksumming: on + scatter-gather: on + tcp segmentation offload: off + +- Turn on Transmit Checksum offload and TSO: + # ethtool -K eth# tx on + # ethtool -K eth# tso on (for 2.6 kernels) + + +6) Receive performance: +----------------------- + +- Ensure Receive Checksum offload is enabled. Use ethtool to verify/set. + # ethtool -k eth# + # ethtool -K eth# rx on + +- If MTU is set to 1500, receive performance can be improved by increasing + the default TCP window size and enabling GRO (see "Configurable driver + parameters" section). + # sysctl -p sysctl_neterion_1500.conf + +- Enable NAPI to bring down CPU utilization. + +- If CPU bottleneck is being hit (close to 0% idle), you can play around with + utilization parameters by using tune_driver script. This may help bring + down CPU utilization and improve throughput. See "Driver tuning" section. + + +7) Troubleshooting: +------------------- + +For X3100 adapter assigned eth2 + +Statistics Dump: + # ethtool -S eth2 + +Register Dump: + # ethtool -d eth2 + +=============================================================================== -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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