in_buf_size
The `in_buf_size` directive specifies the size of the input buffer for the NGINX SRT module, affecting data reception from SRT streams.
Description
The in_buf_size directive defines the size of the input buffer used when receiving data over SRT (Secure Reliable Transport) connections in the NGINX SRT module. This setting is critical for optimizing performance and managing memory effectively during data streaming. By configuring the in_buf_size, you can control how much data can be read in one go from incoming SRT streams, which can influence both latency and throughput depending on the application's workload.
Setting a larger input buffer may reduce the frequency of context switching between the NGINX worker processes and the SRT library, which can be advantageous for high-throughput scenarios. Conversely, if set too large, this might lead to increased memory usage, and latency issues if the buffer rarely gets emptied due to low data transmission rates. It is important to consider the overall networking environment and the nature of the data being streamed when deciding on an appropriate value for this directive.
As this directive is implemented as part of the SRT module's core configuration, it is applicable within the srt and server blocks of your configuration files, making it flexible for specific requirements.
Config Example
srt {
server {
listen 4321;
in_buf_size 16384;
proxy_pass tcp://127.0.0.1:5678;
}
}Setting in_buf_size too small can lead to dropped packets if incoming data exceeds the buffer size.
Remember to consider the overall memory limits of your server when increasing the in_buf_size.
Adjusting this value may necessitate recalibrating other related SRT buffer settings for optimal performance.