nginx/freebsd kern.maxbcache

Hi

I'm trying to tune 'kern.maxbcache' with hope of increasing
'vfs.maxbufspace' so that more files can be stored in buffer memory on
freebsd 9.1
It's suggested to tune this value here
http://serverfault.com/questions/64356/freebsd-performance-tuning-sysctls-loader-conf-kernel
and here http://wiki.nginx.org/FreeBSDOptimizations
However, I can't get the value of 'vfs.maxbufspace' to increase:
kern.maxbcache: 21474836480
vfs.maxbufspace: 3441033216

Did anyone else use this tunable and get results?

Many thanks
Richard

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