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Dropping mb_map

Hi all,
most architectures currently create a submap of the kernel map for use
by the mbuf cluster allocator. I would like to effectively kill that and
use the kmem_map instead. This would allow a dynamic upper limit only
affected by the VA limit of kmem_map.

This case shouldn't be hit too often as the clusters are already
allocated from a pool, so the locking difference shouldn't make a big
difference. Comments?


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