High throughput data transfers between clients and Sybase Event Stream Processor rely on the proper tuning of the underlying operating system's TCP networking system.
The data generated by clients for delivery to ESP does not always arrive at a uniform rate. Sometimes the delivery of data is bursty. In order to accommodate large bursts of network data, large TCP buffers, and TCP send/receive windows are useful. They allow a certain amount of elasticity, so the operating system can temporarily handle the burst of data by quickly placing it in a buffer, before handing it off to ESP for consumption.
If the TCP buffers are undersized, the client may see TCP blockages due to the advertised TCP window size going to zero as the TCP buffers on the ESP server fill up. To avoid this scenario, tune the TCP buffers and window sizes on the server on which ESP is running to between one and two times the maximum size that is in use on all client servers sending data to ESP.
For information and best practices for determining and setting TCP buffer and window sizes, consult the documentation provided with your operating system.