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High CPU Usage After Firmware Upgrade

 

Information

 

Summary:

This article covers the reason CPU usage is high after a firmware upgrade. 

Environment:

Product: LoadMaster

Version: Prior to 7.2.53.0

Platform: Any

Application: Any

Question/Problem Description:

Why the CPU usage is high after the firmware upgrade?

Steps to Reproduce:  
Error Message:  
Defect Number:  
Enhancement Number:  
Cause: When upgrading the LMOS from a version prior to 7.2.53.0 to any LMOS version 7.2.53.0 and above, a new 4096-bit DHE key is generated. On smaller LoadMasters, this can lead to significant CPU and memory consumption that could impact regular virtual service traffic.
Resolution: It is unclear how long this behaviour may last but we have seen cases that the system CPU and/or memory returned to normal between 30 to 60 minutes. It is important to highlight that Progress Kemp strongly recommends that any firmware update be performed in a maintenance interval. 
Workaround:  
Notes: https://support.kemptechnologies.com/hc/en-us/sections/200410777-Release-Notes 

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