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High CPU Usage After Firmware Upgrade





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


Product: LoadMaster

Version: Prior to

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 to any LMOS version 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. 

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