[Intel-gfx] [PATCH] [RFT] drm/i915: Don't waste our paultry cache on a context object

[Chris Wilson]

On Fri, Sep 20, 2013 at 08:05:02AM -0700, Ben Widawsky wrote:
> Context save and restore is by definition a slow process, however it is
> also an infrequent process. Don't try to optimize the save restore at
> the cost of any of our precious cache space. Contexts begin to get quite
> large on HSW and beyond.

Infrequent?
 
> At least for benchmarks people seem to care about, there is almost
> always only 1 context running, which means I don't expect this to do any
> harm. For benchmarks with many contexts, there could be performance
> degradation - but I have a sneaking suspicion the HW will do some fancy
> magic to speak up context save & restores anyway.

There are at least 2 contexts in every benchmark QA cares about. It
wasn't like making them L3 objects in the first place was motivated by
benchmark results...

Anyway the idea was to see if QA still notice a difference...
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre