linux socket buffer size
You're just hitting your system's current sysctl limits net.core.wmem_max and net.core.rmem_max . If the process has superuser privileges, it can use the SO_SNDBUFFORCE and SO_RCVBUFFORCE ioctls to override the limits. If there is a real reason w, For getting the buffer size in c/c++ program the following is the flow int n; unsigned int m = sizeof(n); int fdsocket; fdsocket = socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP); // example getsockopt(fdsocket,SOL_SOCKET,SO_RCVBUF,(void *)&n, &m); // now, I want to send a big file (10-100MB) and I set buffer size to 4Kb, but what is the best buffer size for that? Certainly not 4Kb. At least 32-48Kb, or 64Kb or more ... and make maximum use of the available bandwidth. If you're in control of the other , The default maximum Linux TCP buffer sizes are way too small. TCP memory is calculated automatically based on system memory; you can find the actual values by typing the following commands: $ cat /proc/sys/net/ipv4/tcp_mem. The default and maximum amount,It is not supported for packet sockets (use normal bind(2) there). Before Linux 3.8, this socket option could be set, but could not retrieved with getsockopt(2). Since Linux 3.8, it is readable. The optlen argument should contain the buffer size available, It seems that there is a limit in linux. I have tried setting rmem_max to 2^32-1 with success. 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: root@xxx:/proc/sys/net/core, You can increase the value from the default, but you can't increase it beyond the maximum value. Use setsockopt to change the SO_RCVBUF option: int n = 1024 * 1024; if (setsockopt(socket, SOL_SOCKET, SO_RCVBUF, &n, sizeof(n)) == -1) // deal with, 为所有的协议队列设置操作系统层面的最大的发送buffer size (wmem) 和接收buffer size （rmem）为12 MB。换句话说，设置内存数量，分配给每一个为了传送文件而打开或者是创建的tcp socket 。 警告！在大多数的Linux 中 rmem_max 和 wmem_max 被分配的值为128 k，在一个低延迟的网络环境中，或者是apps ...
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 linux socket buffer size 相關參考資料
c - Does Linux raw socket buffer size have upper limit of 256 K ...
You're just hitting your system's current sysctl limits net.core.wmem_max and net.core.rmem_max . If the process has superuser privileges, it can use the SO_SNDBUFFORCE and SO_RCVBUFFORCE ioc... https://stackoverflow.com How to find the socket buffer size of linux - Stack Overflow
For getting the buffer size in c/c++ program the following is the flow int n; unsigned int m = sizeof(n); int fdsocket; fdsocket = socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP); // example getsockopt(fdsock... https://stackoverflow.com linux - Best tcp send buffer size - Stack Overflow
I want to send a big file (10-100MB) and I set buffer size to 4Kb, but what is the best buffer size for that? Certainly not 4Kb. At least 32-48Kb, or 64Kb or more ... and make maximum use of the avai... https://stackoverflow.com Linux Tune Network Stack (Buffers Size) To Increase Networking ...
The default maximum Linux TCP buffer sizes are way too small. TCP memory is calculated automatically based on system memory; you can find the actual values by typing the following commands: $ cat /pr... https://www.cyberciti.biz socket(7) - Linux manual page - man7.org
It is not supported for packet sockets (use normal bind(2) there). Before Linux 3.8, this socket option could be set, but could not retrieved with getsockopt(2). Since Linux 3.8, it is readable. The o... http://man7.org sockets - Linux UDP max size of receive buffer - Stack Overflow
It seems that there is a limit in linux. I have tried setting rmem_max to 2^32-1 with success. root@xxx:/proc/sys/net/core# echo 2147483647 > rmem_max root@xxx:/proc/sys/net/core# cat rmem_max 214... https://stackoverflow.com sockets - Specifying UDP receive buffer size at runtime in Linux ...
You can increase the value from the default, but you can't increase it beyond the maximum value. Use setsockopt to change the SO_RCVBUF option: int n = 1024 * 1024; if (setsockopt(socket, SOL_SOC... https://stackoverflow.com 调整Linux的网络栈（Buffer Size）来提升网络性能- yexiaoxiaobai ...
为所有的协议队列设置操作系统层面的最大的发送buffer size (wmem) 和接收buffer size （rmem）为12 MB。换句话说，设置内存数量，分配给每一个为了传送文件而打开或者是创建的tcp socket 。 警告！在大多数的Linux 中 rmem_max 和 wmem_max 被分配的值为128 k，在一个低延迟的网络环境中，或者是apps ... https://segmentfault.com |