素包子

echo “1″ > /proc/sys/net/ipv4/tcp_synack_retries
echo “1″ > /proc/sys/net/ipv4/tcp_syn_retries
echo “409600″>    /proc/sys/net/ipv4/route/max_size
echo “2621400″ >/proc/sys/net/ipv4/ip_conntrack_max
echo “4096 87380 349520″ > /proc/sys/net/ipv4/tcp_rmem
echo “4096 87380 349520″ > /proc/sys/net/ipv4/tcp_wmem
echo “500000″ > /proc/sys/net/ipv4/tcp_max_tw_buckets

Increasing the TCP send and receive buffers will increase the performance a lot if (and only if) you have a lot of large files to send.

• net.ipv4.tcp_wmem = 4096 65536 524288
• net.core.wmem_max = 1048576

If you have a lot of large file uploads, increasing the receive buffers will help.

• net.ipv4.tcp_rmem = 4096 87380 524288
• net.core.rmem_max = 1048576

# These ensure that TIME_WAIT ports either get reused or closed fast.
net.ipv4.tcp_fin_timeout = 1
net.ipv4.tcp_tw_recycle = 1
# TCP memory
net.core.rmem_max = 16777216
net.core.rmem_default = 16777216
net.core.netdev_max_backlog = 262144
net.core.somaxconn = 262144

net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_orphans = 262144
net.ipv4.tcp_max_syn_backlog = 262144
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syn_retries = 2

# you shouldn’t be using conntrack on a heavily loaded server anyway, but these are
# suitably high for our uses, insuring that if conntrack gets turned on, the box doesn’t die
net.ipv4.netfilter.ip_conntrack_max = 1048576
net.nf_conntrack_max = 1048576

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