A packet control mechanism for a computer data system that dynamically adjusts packet training depending on the utilization load on the processor. The dynamic adjustment of packet training can be to enable and disable packet training, or adjust the number of packets in the packet train. In preferred embodiments, the computer data system includes a processor utilization mechanism that indicates a load on a processor. When the packet control mechanism determines the load on the processor is above a threshold limit, the packet control mechanism reduces the processor load by compressing the packets into the packet train. The compressing of the packets is stopped or reduced when the processor load is below a threshold in order to increase the data throughput on the network interface.