Help Center> Elastic Load Balance> FAQ> ELB Usage> Performance and Workloads> What Do I Do If a Load Balancer Fails the Stress Test?
View PDF

What Do I Do If a Load Balancer Fails the Stress Test?

  1. Check the load of backend servers. If their CPU usage reaches 100%, applications may have performance bottlenecks.
  2. Check the incoming traffic. If the incoming traffic exceeds the maximum bandwidth set for the EIP, a large number of packets will be lost and requests will not be responded to, thereby affecting the load balancer's performance.
  3. Check the number of short connections in the time_wait state on the clients. A possible cause is that there are insufficient client ports.
  4. The listening queue backlog of the backend servers is full. As a result, the backend server does not respond to SYN ACK packets, and the client times out. You can increase the upper limit of the backlog by adjusting the net.core.somaxconn parameter.