TCP latency issues

Until now we have been troubleshooting connection-related issues. In this section, we will check the latency part. Latency can be on the network, or in application processing on the part of the client or server.

Cause of latency

Identifying the source of latency also plays an important role in TCP troubleshooting. Let's see what the common causes of latency are:

• Network slow wire latency can be measured with the ping utility

• Too many running processes eat memory. Check the memory management, work with free, top command to identify CPU and memory use

• Application not started with sufficient memory or cannot serve more requests

• Bad TCP tuning; verify the /etc/sysctl.cnf file

• Network jitter; verify your network and check with the network administrator

• Poor coding; benchmark your code by performing a load test over the network

• Gateway wrongly set; check the gateway, verify the routing table, and verify the gateway

• Higher hop counts; do a traceroute and check the number of hops (the higher...