On Mon, Jun 27, 2011 at 12:02 PM, Russell King - ARM Linux <linux@xxxxxxxxxxxxxxxx> wrote: > The next thing to think about in DMA-land is whether we should total up > the size of the SG list and choose whether to flush the individual SG > elements or do a full cache flush. There becomes a point where the full > cache flush becomes cheaper than flushing each SG element individually. We noticed that even for a single (large) buffer, any cache flush operation above a certain threshold flushing indiviudal lines become more expensive than flushing the entire cache. I requested colleagues to look into implenting this threshold in the arch/arm/mm/cache-v7.S file. but I think they ran into trouble and eventually had to give up on it. Vijay or Srinidhi, can you share your findings? Thanks, Linus Walleij -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
