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Diffstat (limited to 'Documentation/networking/s2io.txt')
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diff --git a/Documentation/networking/s2io.txt b/Documentation/networking/s2io.txt new file mode 100644 index 000000000000..6726b524ec45 --- /dev/null +++ b/Documentation/networking/s2io.txt @@ -0,0 +1,48 @@ +S2IO Technologies XFrame 10 Gig adapter. +------------------------------------------- + +I. Module loadable parameters. +When loaded as a module, the driver provides a host of Module loadable +parameters, so the device can be tuned as per the users needs. +A list of the Module params is given below. +(i) ring_num: This can be used to program the number of + receive rings used in the driver. +(ii) ring_len: This defines the number of descriptors each ring + can have. There can be a maximum of 8 rings. +(iii) frame_len: This is an array of size 8. Using this we can + set the maximum size of the received frame that can + be steered into the corrsponding receive ring. +(iv) fifo_num: This defines the number of Tx FIFOs thats used in + the driver. +(v) fifo_len: Each element defines the number of + Tx descriptors that can be associated with each + corresponding FIFO. There are a maximum of 8 FIFOs. +(vi) tx_prio: This is a bool, if module is loaded with a non-zero + value for tx_prio multi FIFO scheme is activated. +(vii) rx_prio: This is a bool, if module is loaded with a non-zero + value for tx_prio multi RING scheme is activated. +(viii) latency_timer: The value given against this param will be + loaded into the latency timer register in PCI Config + space, else the register is left with its reset value. + +II. Performance tuning. + By changing a few sysctl parameters. + Copy the following lines into a file and run the following command, + "sysctl -p <file_name>" +### IPV4 specific settings +net.ipv4.tcp_timestamps = 0 # turns TCP timestamp support off, default 1, reduces CPU use +net.ipv4.tcp_sack = 0 # turn SACK support off, default on +# on systems with a VERY fast bus -> memory interface this is the big gainer +net.ipv4.tcp_rmem = 10000000 10000000 10000000 # sets min/default/max TCP read buffer, default 4096 87380 174760 +net.ipv4.tcp_wmem = 10000000 10000000 10000000 # sets min/pressure/max TCP write buffer, default 4096 16384 131072 +net.ipv4.tcp_mem = 10000000 10000000 10000000 # sets min/pressure/max TCP buffer space, default 31744 32256 32768 + +### CORE settings (mostly for socket and UDP effect) +net.core.rmem_max = 524287 # maximum receive socket buffer size, default 131071 +net.core.wmem_max = 524287 # maximum send socket buffer size, default 131071 +net.core.rmem_default = 524287 # default receive socket buffer size, default 65535 +net.core.wmem_default = 524287 # default send socket buffer size, default 65535 +net.core.optmem_max = 524287 # maximum amount of option memory buffers, default 10240 +net.core.netdev_max_backlog = 300000 # number of unprocessed input packets before kernel starts dropping them, default 300 +---End of performance tuning file--- + |