7 Jul
2011
7 Jul
'11
12:38 p.m.
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?