TCP 参数相关

为什么80%的码农都做不了架构师？>>>   

/proc/sys/net/ipv4/tcp_max_syn_backlog  // syn 队列大小 (TCP 三次握手中......)
/proc/sys/net/core/somaxconn            // 三次握手后队列的大小 (accept 读取的独立大小)

（实际大小取这两个的 较小的一个）

iotop, 
slabtop,  
cat /proc/net/sockstat  
信息的记录

echo 3 > /proc/sys/net/ipv4/tcp_early_retrans

if [ $? -ne 0 ]; then
    echo "active tail loss probe: FAILED"
    echo 2 > /proc/sys/net/ipv4/tcp_early_retrans
    show_result "set early_retrans=2" $?
else
    echo "active tail loss probe: SUCC"
fi

echo 0 > /proc/sys/net/ipv4/tcp_thin_dupack
show_result "set thin_dupack=0" $?

echo 1 > /proc/sys/net/ipv4/tcp_thin_linear_timeouts
show_result "set thin_linear_timeouts=1" $?

echo 4 > /proc/sys/net/ipv4/tcp_loss_init_cwnd
show_result "set loss_init_cwnd=4" $?

echo "cubic" > /proc/sys/net/ipv4/tcp_congestion_control
show_result "set congestion_control=cubic" $?

echo 0 > /proc/sys/net/ipv4/tcp_slow_start_after_idle
show_result "set slow_start_after_idle=0" $?

echo 0 > /proc/sys/net/ipv4/tcp_timestamps
show_result "set timestamps=0" $?

echo 16384 >/proc/sys/net/core/netdev_max_backlog
show_result "set netdev_max_backlog=16384" $?

#清 cache

sync
sync
sync
sysctl -w vm.drop_caches=3

 

转载于:https://my.oschina.net/tsh/blog/1154483