High “System” process cpu usage on windows server 2008 r2

cpu-usagetask-managerwindows-server-2008-r2

Our setup is VMWare Esxi system, running on a dual quad core server with 32gb of RAM. It has 4 VM's running on it, and one of them, our file server, ie experiencing high cpu usage for the 'system' process. It's taking up almost 100% of 1 core all the time.

Is this normal? I've only noticed it lately, so I don't think itw as there before? process explorer says ~10% of this is hardware interrupts, 10-20% is deferred procedure calls and the rest is just 'system'

Best Answer

Looks like heavy I/O load... are VMware drivers/tools installed and up to date? How is the load on the underlying physical server? Did you by chance turn on NTFS compression or encryption?

High CPU usage by the 'system' process usually means the server is busy doing hardware-related things that really shouldn't take so much CPU time.