Kafka latency measures

Hi,

We are trying to evaluate Kafka for a real time application. We are sending
50 Kb messages at a fixed rate. The normal messages have a reasonable
latency. But then there are these outliers that takes unpredictable amount
of time. This causes the average latency to increase dramatically. We are
running with basically the default configuration. Any suggestions for
improving the latency?

Thanks in advance,
Supun..