> >sd0: not queuedaha0: DMA beyond end of ISA
> >Oh, btw, my setup is NetBSD 1.0, i386, 20 megs of RAM, AHA scsi...
> Herein lines the problem ... in NetBSD you can't have more than 16Mb with an
> ISA SCSI controller (well, at least one that does bus-master DMA, which
> includes the adaptec 1542).  You'll need to yank out 4Mb.

Hving just upgraded to 16M (ah, it's nice to run X without lighting up the
disk light!), I wondered about the feasability of implementing a RAM disk
that could occupy the memory above 16M.  Configuration, of course, would
be a real pain (ah, for /etc/conf...), but it would at least allow *some*
use to be made of memory in excess of 16M.  (If you *have* to page, would
you rather page to RAM or disk? :-)

Could someone summarize the philosophical objections to FreeBSD's bounce
buffer strategy, and perhaps describe what a tasteful bounce buffer system
would look like?  (Or is someone actively coding one right now?)