LinuxUDP接收缓冲区的最大大小-LinuxUDPmaxsizeofreceivebuffer

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It seems that there is a limit in linux. I have tried setting rmem_max to 2^32-1 with success.

似乎linux中有一个限制。我已经尝试将rmem_max设置为2 ^ 32-1并成功。

   root@xxx:/proc/sys/net/core# echo 2147483647 > rmem_max
   root@xxx:/proc/sys/net/core# cat rmem_max
   2147483647

2^32 was too much:

2 ^ 32太多了：

   root@xxx:/proc/sys/net/core# echo 2147483648 > rmem_max
   root@xxx:/proc/sys/net/core# cat rmem_max
   -18446744071562067968

Setting to 5000000000 yields:

设置为5000000000：

   root@xxx:/proc/sys/net/core# echo 5000000000 > rmem_max
   root@xxx:/proc/sys/net/core# cat rmem_max
   705032704

I have tested in python that setting and getting socket receive buffer with

我在python中测试过设置和获取套接字接收缓冲区

   ss.setsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF, bufferSize)
   print ss.getsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF)

If 'bufferSize' is less then 1024^3 program prints doubled 'bufferSize', otherwise it falls back to 256.

如果'bufferSize'小于1024 ^ 3程序打印加倍'bufferSize'，否则它回落到256。

The value 705032704*2 = 1410065408 is close to the 1409995136 obtained by netstat.

值705032704 * 2 = 141006540​​8接近netstat获得的1409995136。

0  

2^32-1 (2147483647, maximum 32bit signed integer)

2 ^ 32-1（2147483647，最大32位有符号整数）

root@root@localhost:~# sysctl -w net.core.rmem_max=2147483647
net.core.rmem_max = 2147483647

root@localhost:~# sysctl -w net.core.rmem_max=2147483648
sysctl: setting key "net.core.rmem_max": Invalid argument
net.core.rmem_max = 2147483648

Echoing into the /proc filesystem appears to overflow when attempting to set larger values.

尝试设置更大的值时，回显到/ proc文件系统似乎会溢出。