[PATCH 3/8] ARM: dma-mapping: use asm-generic/dma-mapping-common.h

[Russell King - ARM Linux]

On Thu, Jul 07, 2011 at 02:09:18PM +0200, Lennert Buytenhek wrote:
> On Mon, Jun 27, 2011 at 03:19:43PM +0200, Arnd Bergmann wrote:
> 
> > > > I suppose for the majority of the cases, the overhead of the indirect
> > > > function call is near-zero, compared to the overhead of the cache
> > > > management operation, so it would only make a difference for coherent
> > > > systems without an IOMMU. Do we care about micro-optimizing those?
> 
> FWIW, when I was hacking on ARM access point routing performance some
> time ago, turning the L1/L2 cache maintenance operations into inline
> functions (inlined into the ethernet driver) gave me a significant and
> measurable performance boost.

On what architecture?  Can you show what you did to gain that?