Freebsd 8.0 kmem map too small

[Pete French]

> So to recap, vfs.zfs.zio.use_uma doesn't show up in sysctl output.

Errr, does for me....

$ sysctl -a | grep vfs.zfs.zio.use_uma
vfs.zfs.zio.use_uma: 1

Thats from 8.1-PRERELEASE on June 2nd.

...but all the question of sysctls is a bit of a red herring to me ?I'm
more intyerested in whether we really need to disable UMA to get stable
ZFS on amd64 right now.

-pete.