> We are formulating cunning plans of aggregating 2, 4 or 8 pages together
> into "bigpages", telling the arch-independent code that we've got
> larger pages than we really have and manipulating multiple PTEs in the
> set_pte() primitive and friends.
If you ever want to get the networking behaving nicely you want at least a
2K 'logical' page size. There are reasons old BSD used mbufs not linear
buffers.
> How much space tends to be vmalloc()-ed in a running system?
This really depends on the drivers. You can probably get away with using
kmalloc to do vmalloc on a machine when you control the hardware tightly.
If I had to stick a finger in the air I'd guess on a low end box you need
<256K vmalloc space with care.
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