Default Xss is too small for medium-to-large Rails apps

I have a medium-to-largish Rails app that failed to boot properly in Torquebox. The stack track originated from bundler and indicated that there was a stack overflow. I naively assumed that something landed in an infinite loop and that RVM was somehow messing with things. As it turns out, the default JVM Xss is just too small. So far I'm having luck with a value of "2048k".