sysctl -w net.ipv4.tcp_max_syn_backlog=6000　设置不成功？

sysctl -w net.ipv4.tcp_syncookies=1
sysctl -w net.ipv4.tcp_synack_retries=1
sysctl -w net.ipv4.tcp_syn_retries=1
sysctl -w net.ipv4.tcp_max_syn_backlog=6000
sysctl -w net.ipv4.conf.all.send_redirects=0
sysctl -w net.ipv4.conf.all.accept_redirects=0
sysctl -w net.ipv4.tcp_fin_timeout=30      
sysctl -w net.ipv4.tcp_keepalive_time=60           
sysctl -w net.ipv4.tcp_window_scaling=1
sysctl -w net.ipv4.icmp_echo_ignore_all=1
sysctl -w net.ipv4.icmp_echo_ignore_broadcasts=1

echo 2048 > /proc/sys/net/ipv4/tcp_max_syn_backlog
echo 1 > /proc/sys/net/ipv4/tcp_synack_retries
echo 1 > /proc/sys/net/ipv4/tcp_syn_retries
echo 1 > /proc/sys/net/ipv4/tcp_syncookies

运行了上面的，我把tcp_max_syn_backlog这个文件打开看值还是1

直接修改配置文件