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- 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---
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