[PATCH v2 05/23] ARM: Kirkwood: Seperate board-dt from common and pcie code.

Arnd Bergmann
2014-02-18T18:43:21Z

On Tuesday 18 February 2014 11:37:46 Jason Gunthorpe wrote:
>
> No idea of the history, but for DMA heavy work loads write-through is
> better since you spend less cpu cycles doing cache flushing, while for
> CPU centric work loads write-back is better since you spend less time
> waiting for memory.
>
> Since these SOCs are popular for storage and networking apps I'm not
> surprised to see this option.

Ok, that makes much more sense than anything I could come up with ;-)

> But a static config option is not really in-line with current thinking
> on these sorts of things. A DT option would be better (IMHO), but even
> that is probably not going to be universally loved.

One of the later patches actually introduced a DT property for
it, but the implementation of that seemed incomplete, so the current
plan is to keep the Kconfig option for now.

> Can we worry about this after Andrew's shuffling is done?

Sure.

Arnd