korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-12-20 09:34:44 +08:00
Code Issues Packages Projects Releases Wiki Activity

drm/i915: Use MLC (l3$) for context objects

Browse Source 
Enabling context support increases SwapBuffers latency by about 20%
(measured on an i7-3720qm). We can offset that loss slightly by enabling
faster caching for the contexts. As they are not backed by any
particular cache (such as the sampler or render caches) our only option
is to select the generic mid-level cache. This reduces the latency of
the swap by about 5%.

Oddly this effect can be observed running smokin-guns on IVB at
1280x1024:
Using BLT copies for swaps: 151.67 fps
Using Render copies for swaps (unpatched):  141.70 fps
With contexts disabled: 150.23 fps
With contexts in L3$: 150.77 fps

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Ben Widawsky <ben@bwidawsk.net>
Cc: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2013-04-08 14:28:40 +01:00 committed by Daniel Vetter
parent 57d277bbfc
commit 4615d4c9e2
1 changed files with 7 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/gpu/drm/i915/i915_gem_context.c
View File

@ -152,6 +152,13 @@ create_hw_context(struct drm_device *dev,
return ERR_PTR(-ENOMEM);
}
if (INTEL_INFO(dev)->gen >= 7) {
ret = i915_gem_object_set_cache_level(ctx->obj,
I915_CACHE_LLC_MLC);
if (ret)
goto err_out;
}
/* The ring associated with the context object is handled by the normal
* object tracking code. We give an initial ring value simple to pass an
* assertion in the context switch code.