Freebsd 8.0 kmem map too small

NFS server amd64 Freebsd 8.0 recent (2 days ago)

This server has been running for several months without problems.
Beginning last week, however, I'm experiencing panics (about 1 per day)
with the error in the subject

Current settings:


vm.kmem_size_scale: 3
vm.kmem_size_max: 329853485875
vm.kmem_size_min: 0
vm.kmem_size: 2764046336
...
hw.physmem: 8568225792
hw.usermem: 6117404672
hw.realmem: 9395240960
...
vfs.zfs.l2arc_noprefetch: 0
vfs.zfs.l2arc_feed_secs_shift: 1
vfs.zfs.l2arc_feed_secs: 1
vfs.zfs.l2arc_headroom: 128
vfs.zfs.l2arc_write_boost: 67108864
vfs.zfs.l2arc_write_max: 67108864
vfs.zfs.arc_meta_limit: 431882240
vfs.zfs.arc_meta_used: 431874720
vfs.zfs.arc_min: 215941120
vfs.zfs.arc_max: 1727528960


I've set nothing in either /boot/loader.conf or sysctl.conf


What should I do?
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