title: The steal time was too high in AWS EC2
body: <p>I have used to AWS EC2 to deploy a Python App which consuming data from Apache Kafka. And recently several day, I found that the steal time of CPU would become too high (about 35%) when the incoming data become large.</p>
  
  <p><a href="https://i.stack.imgur.com/WXX1O.png" rel="noreferrer"><img src="https://i.stack.imgur.com/WXX1O.png" alt="The following figure shown the CPU usage of that machine, given by Zabbix"></a></p>
  
  <p>The EC2 instance used is <strong>t2.medium</strong>, 2 CPU and 4G memory. Anybody could tell me why this would be happen and is there any way to avoid it.</p>