[Intel-gfx] [PATCH 06/19] drm/i915/gt: Schedule request retirement when submission idles

[Chris Wilson]

Quoting Chris Wilson (2019-11-19 16:42:28)
> Quoting Tvrtko Ursulin (2019-11-19 16:33:18)
> > I also wonder if the current flush_submission wasn't the reason for 
> > performance regression you were seeing with this? It makes this tasklet 
> > wait for all other engines, if they are busy. But not sure.. perhaps it 
> > is work which would be done anyway.
> 
> I haven't finished yet; but the baseline took a big nose dive so it
> might be enough to hide a lot of evil.

Early results yet, but the extra work is exacerbating the regressions in
gem_wsim, enough that this cannot land as is and we do need to be
smarter.
-Chris