From: Jeff Garzik [off-list ref]
   Date: Tue, 10 Jun 2003 13:16:17 -0400

   On Tue, Jun 10, 2003 at 10:02:09AM -0700, David S. Miller wrote:
   > This means end users don't see the benefit, so I definitely
   > prefer Andi's idea.
   
   Making every IO a conditional branch?  Ug.
   
A PIO costs hundreds if not thousands of instructions!
Come on Jeff, get real :-)