On Friday 15 August 2008, David Brownell wrote: > Someone commented that this is what caused creation of > the mmio_insl() family of routines ... > > ... but I notice that at least on ARM (current primary home > for this driver!) those calls don't end up using optimized > code. Since those optimimzed loops are a *big* win in terms > of performance -- using LDM/STM to burst memory acccess to/from > registers -- I'd rather not go that way for now. Oh, and worth remembering: *WHEN* a clean solution for this is available, it should be usable in the NAND code. And surely in other places which sometimes need PIO access to a FIFO... I was surprised to see that 16% improvement in read performance with an 8-bit NAND device, just by switching from code looking like generic mmio_insb() over to __raw_readsb(). Better IMO to have the faster code be what the NAND core uses by default, than to need to modify every platform's NAND driver to do that. - Dave -- 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
