jonathan
Sat Feb 21 12:20:55 PST 1998
Update of /cvsroot/src/sys/arch/pmax/dev
In directory nb00:/tmp/cvs-serv29610

Modified Files:
	rz.c 
Log Message:
Move existing contextsw-avoidance code in rzdump() earlier, since rzready()
also calls biowait().

Some drives seek to modepage on every modepage geometry-sense in rzready()
cache dev_t of last readied device in rzdump() to elide rzready() calls.
2x speedup of dumps on rz25 and 20x-30x speedup on some IBM OEM 4gig drives.