How Big Should TCP buffer be?
The default buffer size is 8 KB. The maximum size is 8 MB (8096 KB). The optimal buffer size depends on several network environment factors including types of switches and systems, acknowledgment timing, error rates and network topology, memory size, and data transfer size.
What does the return value of recv () indicate?
Returned value. If successful, recv() returns the length of the message or datagram in bytes. The value 0 indicates the connection is closed.
What is recv () in TCP?
The recv function is used to read incoming data on connection-oriented sockets, or connectionless sockets. When using a connection-oriented protocol, the sockets must be connected before calling recv. When using a connectionless protocol, the sockets must be bound before calling recv.
What is a good receive buffer size?
8K is a reasonable buffer size – not so big that you’ll waste a lot of memory, and not so small that you’ll have to use loads of wasted Receive calls.
What should receive buffer size be?
For most WAN deployments, the receive buffer size should be in the 2 MB range.
What’s the difference between RECV and read?
The only difference between recv() and read(2) is the presence of flags. With a zero flags argument, recv() is generally equivalent to read(2) (but see NOTES).
What happens if socket buffer is full?
If the receive buffer is full and the other end of the TCP connection tries to send additional data, the kernel will refuse to ACK the packets. This is just regular TCP congestion control.
Does recv wait for data?
If no messages are available at the socket, the recv() call waits for a message to arrive unless the socket is nonblocking. If a socket is nonblocking, -1 is returned and the external variable errno is set to EWOULDBLOCK. select() can be used to wait for incoming messages.
What is a good receive buffer?
What does buffer size mean?
Buffer size is the number of samples (which corresponds to the amount of time) it takes for your computer to process any incoming audio signal. A higher buffer size will result in greater latency (delay) and the higher it is set (larger number), the more noticeable it will become.
Why does recv fail with wsaeconnreset?
If the connection has been reset, a recv will fail with the error WSAECONNRESET. The flags parameter can be used to influence the behavior of the function invocation beyond the options specified for the associated socket. The semantics of this function are determined by the socket options and the flags parameter.
Why does WSARecv return socket_error when no data is available?
If no incoming data is available at the socket, the recv call blocks and waits for data to arrive according to the blocking rules defined for WSARecv with the MSG_PARTIAL flag not set unless the socket is nonblocking. In this case, a value of SOCKET_ERROR is returned with the error code set to WSAEWOULDBLOCK.
What does recv do in sockets?
For connected or connectionless sockets, the recv function restricts the addresses from which received messages are accepted. The function only returns messages from the remote address specified in the connection. Messages from other addresses are (silently) discarded.
What is the return value of recv?
See the Remarks section for details on the possible value for this parameter. If no error occurs, recv returns the number of bytes received and the buffer pointed to by the buf parameter will contain this data received. If the connection has been gracefully closed, the return value is zero.