IBM Support

Passing the kernel boot parameter clock=pmtmr to a VMI kernel might cause a performance degradation

Troubleshooting


Problem

The default virtual machine interface (VMI) kernel does not pass the clock=pmtmr parameter to the kernel. However, if you pass the clock=pmtmr boot parameter to a virtual image with a VMI kernel, you might see a performance degradation.

Symptom

Diagnosing The Problem

You can check for a performance degradation with standard performance bench-marking software, such as SPECjAppServer.

Resolving The Problem

Using an editor, such as vi, open the /boot/grub/menu.lst file and remove the clock=pmtmr boot parameter on the kernel command line for the desired VMI kernel.

Example:
/boot/grub/menu.lst

Related Information

[{"Product":{"code":"SSCKBL","label":"WebSphere Application Server Hypervisor Edition"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Component":"General","Platform":[{"code":"PF016","label":"Linux"}],"Version":"7.0;6.1","Edition":"","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
15 June 2018

UID

swg21391344