3.To set a particular variable, use the /usr/local/bin/nxge_config if_name set param_name value:
#/usr/local/bin/nxge_config eth4 set class_opt_ipv4_tcp 0xfe0
Tuning for Maximum Performance on a Linux Platform
The following tunings will improve the performance of the Sun x8 Express Dual 10 Gigabit Ethernet device driver on a system running the Linux operating system.
1.Create the conf file (for example, sysctl_nxge.conf) that will be called by the sysctl utility.
### 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
