High DataPlane cores utilization after upgrading sonicOS version to 6.5.4.8-89n

If you're noticing high DataPlane cores utilization after upgrading sonicOS version to 6.5.4.8-89n, latency in LAN network and firewall GUI management please consider the resolution provided in this article. 

NOTE:This is in fact that there were no changes in the environment, topology and traffic profile when observing this issue post firmware update. Also, perform safe downgrade to the version you were  previously on and check if it takes the CPU utilization back to normal which is a strong indication the issue is related to this hotfix.
How Do I Safely Perform A Firewall Firmware Downgrade?

We have a hotfix release to address this issue hence please upgrade the firewall to 6.5.4.8-89n--HFGEN6-2737-17n by following below steps:

1. Export the configuration and create a local backup file on the firewall 
   How Can I Save A Backup Settings File From A SonicWall Firewall?
   
2. Open a support ticket to collect the hotfix build for your device model 
   There are two ways to contact technical support:

   1. Online: Visit mysonicwall.com. Once logged in select Resources & Support | Support | Create Case. 

   2. By phone: please use our toll-free number at 1-888-793-2830. Please have your SonicWall serial number available to create a new support case.

   If you do not have a mysonicwall.com account create one for free!

3. Schedule a maintenance window and upgrade the device to the hotfix
   How Can I Upgrade SonicOS Firmware?

The issue has also been fixed on 6.5.4.9-92n.