[Intel-gfx] [PATCH] drm/i915/selftests: Trim blitter block size

[Chris Wilson]

Quoting Matthew Auld (2020-02-10 12:47:35)
> On Thu, 6 Feb 2020 at 14:10, Chris Wilson <chris at chris-wilson.co.uk> wrote:
> >
> > Reduce the amount of work we do to verify client blt correctness as
> > currently our 0.5s subtests takes about 15s on slower devices!
> >
> > v2: Grow the maximum block size until we run out of time
> >
> > Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> 
> Is that bsw-kefka issue(coherency?) something new?

It's something to worry about.

This version is much harsher on the shared-gtt as it doesn't try to
relax our requests to allow parallelism between threads. We can reduce
the per-thread sizes again to sweep the problem under the carpet for a
bit longer.
-Chris