Cisco Cisco Email Security Appliance X1070 Troubleshooting Guide
High CPU Utilization after the ESA Upgrade to
AsyncOS 9.7.x
AsyncOS 9.7.x
Contents
Introduction
Prerequisites
Requirements
Components Used
High CPU utilization after upgrading ESA to AsyncOS 9.7.x
CPU Usage by Function
What Changed?
Pre AsyncOS 9.7:
AsyncOS 9.7 and above:
CPU Load vs. CPU Utilization
Introduction
This document describes the reason CPU utilization may be higher after upgrading to AsyncOS
9.7.x on the Cisco Email Security Appliance (ESA).
9.7.x on the Cisco Email Security Appliance (ESA).
Prerequisites
Requirements
There are no specific requirements for this document.
Components Used
This document is not restricted to specific software and hardware versions.
The information in this document was created from the devices in a specific lab environment. All of
the devices used in this document started with a cleared (default) configuration. If your network is
live, make sure that you understand the potential impact of any command.
the devices used in this document started with a cleared (default) configuration. If your network is
live, make sure that you understand the potential impact of any command.
High CPU utilization after upgrading ESA to AsyncOS 9.7.x
After upgrading to AsyncOS 9.7.x, you may find that overall CPU utilization is significantly higher
than previous versions of AsyncOS. This is due to a change in how this number is calculated in
AsyncOS 9.7 and above.
than previous versions of AsyncOS. This is due to a change in how this number is calculated in
AsyncOS 9.7 and above.
CPU Usage by Function
In all versions of AsyncOS, some of the individual subsystems on the appliance have CPU usage