Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | S2IO Technologies XFrame 10 Gig adapter. |
| 2 | ------------------------------------------- |
| 3 | |
| 4 | I. Module loadable parameters. |
| 5 | When loaded as a module, the driver provides a host of Module loadable |
| 6 | parameters, so the device can be tuned as per the users needs. |
| 7 | A list of the Module params is given below. |
| 8 | (i) ring_num: This can be used to program the number of |
| 9 | receive rings used in the driver. |
| 10 | (ii) ring_len: This defines the number of descriptors each ring |
| 11 | can have. There can be a maximum of 8 rings. |
| 12 | (iii) frame_len: This is an array of size 8. Using this we can |
| 13 | set the maximum size of the received frame that can |
| 14 | be steered into the corrsponding receive ring. |
| 15 | (iv) fifo_num: This defines the number of Tx FIFOs thats used in |
| 16 | the driver. |
| 17 | (v) fifo_len: Each element defines the number of |
| 18 | Tx descriptors that can be associated with each |
| 19 | corresponding FIFO. There are a maximum of 8 FIFOs. |
| 20 | (vi) tx_prio: This is a bool, if module is loaded with a non-zero |
| 21 | value for tx_prio multi FIFO scheme is activated. |
| 22 | (vii) rx_prio: This is a bool, if module is loaded with a non-zero |
| 23 | value for tx_prio multi RING scheme is activated. |
| 24 | (viii) latency_timer: The value given against this param will be |
| 25 | loaded into the latency timer register in PCI Config |
| 26 | space, else the register is left with its reset value. |
| 27 | |
| 28 | II. Performance tuning. |
| 29 | By changing a few sysctl parameters. |
| 30 | Copy the following lines into a file and run the following command, |
| 31 | "sysctl -p <file_name>" |
| 32 | ### IPV4 specific settings |
| 33 | net.ipv4.tcp_timestamps = 0 # turns TCP timestamp support off, default 1, reduces CPU use |
| 34 | net.ipv4.tcp_sack = 0 # turn SACK support off, default on |
| 35 | # on systems with a VERY fast bus -> memory interface this is the big gainer |
| 36 | net.ipv4.tcp_rmem = 10000000 10000000 10000000 # sets min/default/max TCP read buffer, default 4096 87380 174760 |
| 37 | net.ipv4.tcp_wmem = 10000000 10000000 10000000 # sets min/pressure/max TCP write buffer, default 4096 16384 131072 |
| 38 | net.ipv4.tcp_mem = 10000000 10000000 10000000 # sets min/pressure/max TCP buffer space, default 31744 32256 32768 |
| 39 | |
| 40 | ### CORE settings (mostly for socket and UDP effect) |
| 41 | net.core.rmem_max = 524287 # maximum receive socket buffer size, default 131071 |
| 42 | net.core.wmem_max = 524287 # maximum send socket buffer size, default 131071 |
| 43 | net.core.rmem_default = 524287 # default receive socket buffer size, default 65535 |
| 44 | net.core.wmem_default = 524287 # default send socket buffer size, default 65535 |
| 45 | net.core.optmem_max = 524287 # maximum amount of option memory buffers, default 10240 |
| 46 | net.core.netdev_max_backlog = 300000 # number of unprocessed input packets before kernel starts dropping them, default 300 |
| 47 | ---End of performance tuning file--- |
| 48 | |