Is there any reason (other than memory consumption) to refrain from 
changing COM_RING_SIZE from 2048 to, say, 32768?  The comments indicate 
that it's patchable, but has to be a power of 2.  It's used as the arg 
to malloc(); are there limits to how large a block kernel malloc() can 
allocate?

My concern is the data rate of the Novatel "Merlin for Ricochet" PCMCIA 
modem.  Linux has problems with its data rate (for details, see
http://homepages.nyu.edu/~gmp216/nrm6842/bigfastuart.html); in a very 
brief test today, I saw some indications that NetBSD was overflowing 
that buffer as well.

		--Steve Bellovin, http://www.research.att.com/~smb