Yeah, PAL calls are very expensive. On a zx1-type machine, I/O reads take on the order of 1,000 cycles, so a PAL call would be an order of magnitude more expensive. Is PAL_MC_FLUSH really needed in that case?
--david On 7/11/05, Luck, Tony <[EMAIL PROTECTED]> wrote: > > >Why not be extra safe and call PAL_MC_FLUSH? Or would that be too > >expensive? > > Just timed a call to PAL_MC_DRAIN (which is what I assume you meant). > > Just over 13,000 cycles. > > Is that too expensive? How long does an i/o read take from a typical device? > > -Tony > - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
