You can download a patch from
http://www.cs.rice.edu/~alc/amd64_kvm_6GB.patch that increases amd64's
kernel virtual address space to 6GB. This patch also increases the
default for the kmem map to almost 2GB. I believe that kernel loadable
modules still work. However, I suspect that mini-dumps are broken.
I don't plan on committing this patch in its current form. Some of the
changes are done in a hackish way. I am, however, curious to hear
whether or not it works for you.
Alan
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