Linux 网卡性能优化设置

在高速网络传输中，每秒传输的数据量非常大。网络设备设置有一种缓存机制，即“缓存区”，在 Linux 系统中，网卡缓冲分为两种类型：软件缓冲区和硬件缓冲区。
要提高网络吞吐率，首先当然是升级linux kernel。其次是设置linux系统参数和网卡驱动参数。
查看当前linux系统参数
$ cat /etc/sysctl.conf 
    vm.swappiness = 0
    net.ipv4.neigh.default.gc_stale_time = 120

    # see details in https://help.aliyun.com/knowledge_detail/39428.html
    net.ipv4.conf.all.rp_filter = 0
    net.ipv4.conf.default.rp_filter = 0
    net.ipv4.conf.default.arp_announce = 2
    net.ipv4.conf.lo.arp_announce = 2
    net.ipv4.conf.all.arp_announce = 2

    # see details in https://help.aliyun.com/knowledge_detail/41334.html
    net.ipv4.tcp_max_tw_buckets = 5000
    net.ipv4.tcp_syncookies = 1
    net.ipv4.tcp_max_syn_backlog = 1024
    net.ipv4.tcp_synack_retries = 2

    net.ipv6.conf.all.disable_ipv6 = 1
    net.ipv6.conf.default.di