[Intel-gfx] [PATCH] drm/i915: Disable THP until we have a read BW W/A

[Chris Wilson]

Quoting Chris Wilson (2017-11-24 12:12:33)
> Quoting Joonas Lahtinen (2017-11-24 11:27:50)
> > We seem to be missing some W/A for 2M pages and are getting
> > a hit on raw read bandwidths (even 30%) even though the write
> > bandwidths improve (even 10%).
> > 
> > For now, disable THP, which is our only practical source of
> > 2M pages until we have a W/A for the issue.
> > 
> > Reported-by: Valtteri Rantala <valtteri.rantala at intel.com>
> > Fixes: b901bb89324a ("drm/i915/gemfs: enable THP")
> > Signed-off-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
> > Cc: Matthew Auld <matthew.auld at intel.com>
> > Cc: Chris Wilson <chris at chris-wilson.co.uk>
> > Cc: Jani Nikula <jani.nikula at linux.intel.com>
> > Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
> > Cc: Valtteri Rantala <valtteri.rantala at intel.com>
> > Cc: Eero Tamminen <eero.t.tamminen at intel.com>
> 
> I don't have much to say, a lot of unknowns and you've already concisely
> summed up everything that is known.
> Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>

Bah, what works on the cmdline isn't allowed as an option!
Apparently, s/deny/never/
-Chris