On Wednesday 11 October 2006 03:46, Geoff Levand wrote: > > > > The others look good, but this one complicates the code and doesn't have > > any benefit. 20 > > for 21 isn't bad. > > Is the motivation for this change to improve performance by reducing the > overhead > of the mapping calls? If so, there may be some benefit for some systems. > Could > you please elaborate? >
>From what I understand, this patch drastically reduces the number of I/O PTEs that are needed in the iommu. With the current static IOMMU mapping, it should only make a difference during initialization, but any platform that uses a dynamic mapping of iommu entries will benefit a lot from it, because: - the card can do better prefetching of consecutive memory - there are more I/O ptes available for other drivers. Arnd <>< - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html