Playing with Xen, Fedora Core 6, and 8-way Opteron system at work with 8 gig of memory: Xen seems to stop being able to create domains after it has been up for a while (doing things like testing lots of guest installs or even just dom0 for non-xen related testing). Any attempt at this point to create a new domain winds up with error (12, ''Cannot allocate memory''), and the xend-debug.log shows ERROR: Could not enable shadow paging for domain. Rebooting the machine (the real one :-) fixes the problem until it has been up for a while again... This sound familiar to anyone? Should I file a bug (what would be a good component to use? kernel-xen?).