Function s2n_quic_tls::ffi::s2n_config_set_send_buffer_size

pub unsafe extern "C" fn s2n_config_set_send_buffer_size(
    config: *mut s2n_config,
    size: u32
) -> i32

Set a custom send buffer size.

This buffer is used to stage records for sending. By default, enough memory is allocated to hold a single record of the maximum size configured for the connection. With the default fragment size, that is about 8K bytes.

Less memory can be allocated for the send buffer, but this will result in smaller, more fragmented records and increased overhead. While the absolute minimum size required is 1034 bytes, at least 2K bytes is recommended for reasonable record sizes.

More memory can be allocated for the send buffer. This will result in s2n-tls buffering multiple records before sending them, reducing system write calls. At least 17K bytes is recommended for this use case, or at least 35K bytes if larger fragment sizes are used via s2n_connection_prefer_throughput().

@param config The configuration object being updated @param size The desired custom buffer size. @returns S2N_SUCCESS on success. S2N_FAILURE on failure