Linux内核每个TCP/IP网络连接消耗多少内存? [英] How much memory is consumed by the Linux kernel per TCP/IP network connection?

问题描述

Linux内核平均每个TCP/IP网络连接消耗多少内存(在内核地址空间中)?

How much memory on average is consumed by the Linux kernel (in kernel address space) per TCP/IP network connection?

推荐答案

对于TCP连接，消耗的内存取决于

For a TCP connection memory consumed depends on

1. sk_buff的大小(Linux内核使用的内部网络结构)

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

用于连接的读写缓冲区

可以根据需要调整缓冲区的大小

the size of buffers can be tweaked as required

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

检查这些变量

这些参数指定内核中所有网络连接的最大默认内存缓冲区使用量

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

这些指定特定于tcp连接的缓冲存储器使用情况

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

指定的三个值是最小默认最大"缓冲区大小. 因此从linux开始，将对每个连接使用默认值的读写缓冲区. 随着连接数量的增加，这些缓冲区将减少[最多直到指定的最小值] 最大缓冲区值也是如此.

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.

可以使用此sysctl -w KEY=KEY VALUE

例如下面的命令确保每个连接的读写缓冲区分别为4096.

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'

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