zoukankan      html  css  js  c++  java
  • How much memory is consumed by the Linux kernel per TCP/IP network connection?

    For a TCP connection memory consumed depends on

    1) size of sk_buff (internal networking structure used by linux kernel)

    2) the read and write buffer for a connection

    the size of buffers can be tweaked as required

    root@x:~# sysctl -A | grep net | grep mem

    check for these variables

    these specify the maximum default memory buffer usage for all network connections in kernel

    net.core.wmem_max = 131071

    net.core.rmem_max = 131071

    net.core.wmem_default = 126976

    net.core.rmem_default = 126976

    these specify buffer memory usage specific to tcp connections

    net.ipv4.tcp_mem = 378528 504704 757056

    net.ipv4.tcp_wmem = 4096 16384 4194304

    net.ipv4.tcp_rmem = 4096 87380 4194304

    the three values specified are " min default max" buffer sizes. So to start with linux will use the default values of read and write buffer for each connection. As the number of connection increases , these buffers will be reduced [at most till the specified min value] Same is the case for max buffer value.

    These values can be set using this sysctl -w KEY=KEY VALUE

    eg. The below command ensures the read and write buffers for each connection are 4096 each.

    sysctl -w net.ipv4.tcp_rmem='4096 4096 4096'

    sysctl -w net.ipv4.tcp_wmem='4096 4096 4096'

    原文

    http://stackoverflow.com/questions/8646190/how-much-memory-is-consumed-by-the-linux-kernel-per-tcp-ip-network-connection

  • 相关阅读:
    JSP脚本指令
    JSP编译指令——page、include
    c++基础(三):多态
    c++基础(一):数据类型和结构
    c++基础(二):成员he派生类
    python小算法(二)
    python的内存管理
    初识java之Mina(一)
    python的小爬虫的基本写法
    python小算法(一)
  • 原文地址:https://www.cnblogs.com/mydomain/p/3100846.html
Copyright © 2011-2022 走看看