increasing buffer cache

[Petri Helenius]

I tried increasing buffer cache on machine with 4G ram and amd64 kernel 
with the following in /boot/loader.conf;

kern.maxbcache=1250000000
kern.nbuf=65536
vm.kmem_size=1300000000
vm.kmem_size_max=1300000000

However the system panics on boot with a malloc error. Any other 
parameters that need to be tuned?

Pete