On Thu, 2008-05-29 at 14:48 -0700, Trent Piepho wrote: > I wrote a JTAG over gpio driver for the powerpc MPC8572DS platform. With the > non-raw io accessors, the JTAG clock can run at almost ~9.5 MHz. Using raw > versions (which I had to write since powerpc doesn't have any), the clock > speed increases to about 28 MHz. So it can make a very significant different. Yes, sync's can hurt a lot. This is why I initially tried to get more relaxed semantics. We could implement something like __ variants and do something that would still have eieio's but not sync's for example (ie. MMIOs are still ordered vs. each other but not vs. coherent memory). Ben. -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
