PAE and 8GB - page fault
Here is some notes about PAE on FreeBSD and high amount (>4GB) of memory. I have use PAE few times, but only with 4GB of memory. This time i had 8 on production server, so reinstall to amd64 is not option, thats because i choose PAE.
I thought that is trivial task untill i get panic: page fault while booting to new PAE kernel. Here is screenshot:
Problem was in KVA_PAGES value. On PAE enabled kernels, when amount on memory more than 4GB you need set KVA_PAGES value to 1024 (at least). After kernel rebuild i have successfully boot server with new hardware. Total downtime less than 30 minutes. I know it looks pretty simple, but only if you know about this issue ;-)
Anyway PAE sucks!