I am running ESXi 4.1.0. I have a number of 2k8 R2 machines running on this server.
What I've noticed is that some, not all VMs are using 75%-95% of the available memory. When I look at the processes running, it's very minimal with nothing really using anywhere near that much memory. I used RamMap to try to try to see who was the hidden culprit. RamMap showed that "Driver Locked" was using 4-5GB of memory. (As shown here in another site thread)
Upon further research, I found some people said this was related to VMWare Tools. Sure enough, as soon as I uninstalled VMWare Tools from the VM the memory went to where I would expect, and "Driver Locked" went to almost nothing, and eventually disappeared.
I installed VMWare tools with an upgrade when I converted the VM. Of the maybe 12 VMs I think 3-4 are experienceing this.
Anyone have any thoughts?