Sun Microsystems Ethernet MMF/UTP Adapter - Manual (Page 116)

82 Sun PCI-Express Dual Gigabit Ethernet MMF/UTP Adapter Installation and User’s Guide • June 2006
2. Create the conf file (for example, sysctl_e1000.conf) that will be called by the
sysctl utility.
Setting Driver Parameters in a Linux
Environment
In a Linux operating system, the driver parameters can only be set at the time the
driver is loaded. If you have already loaded the driver and have not set the
parameters at the same time. Remove the driver and reinstall it.
### IPV4 specific settings
# turns TCP timestamp support off, default 1, reduces CPU use
net.ipv4.tcp_timestamps = 0
# turn SACK support off, default on systems with a VERY fast bus ->
# memory interface this is the big gainer
net.ipv4.tcp_sack = 0
# sets min/default/max TCP read buffer, default 4096 87380 174760
net.ipv4.tcp_rmem = 10000000 10000000 10000000
# sets min/pressure/max TCP write buffer, default 4096 16384 131072
net.ipv4.tcp_wmem = 10000000 10000000 10000000
# sets min/pressure/max TCP buffer space, default 31744 32256 32768
net.ipv4.tcp_mem = 10000000 10000000 10000000
### CORE settings (mostly for socket and UDP effect)
# maximum receive socket buffer size, default 131071
net.core.rmem_max = 524287
# maximum send socket buffer size, default 131071
net.core.wmem_max = 524287
# default receive socket buffer size, default 65535
net.core.rmem_default = 524287
# default send socket buffer size, default 65535
net.core.wmem_default = 524287
# maximum amount of option memory buffers, default 10240
net.core.optmem_max = 524287
# number of unprocessed input packets before kernel starts dropping
# them, default 300
net.core.netdev_max_backlog = 300000