[Users] Question about: Host swap percentage is above the defined threshold.

Hi I currently have a one node ovirt setup I am migrating VMs to. I have reached a point where trying to start new VMs I get: Error while executing action: Cannot run VM. Host swap percentage is above the defined threshold. - Check your configuration parameters for Host Swap Percentage. Adjusting the BlockMigrationOnSwapUsagePercentage setting seems to do nothing. The node does have lots of free RAM and is current sitting at 68%. The node is a full fedora 17 minimal install and does have a large swap partition on fast 15k SAS disks and 48gig of RAM. So why is changing the BlockMigrationOnSwapUsagePercentage not doing anything and how do it get more VMs running? I need to over commit a bit but will be adding a new identical node to spread the load once I get all the VMs off the machine I am migrating from. I also notice the "Shared Memory" value is 0% why is this so? Do I need to set something to get same page sharing? Thanks for any advice. Regards Daniel