I've just noticed our TMG 2010 SE server (which has 16gb ram) shows a constant 2gb of Available memory in the Dashboard, of which 100% is used continually.

Is that normal? It seems odd that TMG doesn't grab more ram if its 100% used, or does it just reserve the 2GB and use more when required? We haven't noticed any performance issues (although there are quite a few log entries for 'Compression Failure' but that could be the website's themselves)

Searching around seems to only show that 2gb is the minimum requirement for SE tpo work as a firewall etc, but not if theres a maximum or way of adjusting the usage.