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authorJoonas Lahtinen <joonas.lahtinen@linux.intel.com>2017-11-27 12:12:33 +0300
committerJoonas Lahtinen <joonas.lahtinen@linux.intel.com>2017-11-30 11:11:49 +0300
commitfd50fbb6bfdea5daa4ae4dd7b7082485ac44bdf5 (patch)
tree866705db14c323f1233b0e9724ce2ae018c823d3 /drivers
parent05dfe9f2be9de988ef49eca85f8c02315e147e38 (diff)
downloadlinux-fd50fbb6bfdea5daa4ae4dd7b7082485ac44bdf5.tar.xz
drm/i915: Disable THP until we have a GPU read BW W/A
We seem to be missing some W/A for 2M pages and are getting a hit on raw GPU read bandwidths (even 30%) even though the GPU 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. v2: - Be explicit that we talk about GPU bandwidths (Eero) - s/deny/never/ because that's why (Chris) Reported-by: Valtteri Rantala <valtteri.rantala@intel.com> Fixes: b901bb89324a ("drm/i915/gemfs: enable THP") Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Cc: Matthew Auld <matthew.auld@intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Jani Nikula <jani.nikula@linux.intel.com> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com> Cc: Valtteri Rantala <valtteri.rantala@intel.com> Cc: Eero Tamminen <eero.t.tamminen@intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Tested-by: Valtteri Rantala <valtteri.rantala@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20171127091233.7001-1-joonas.lahtinen@linux.intel.com (cherry picked from commit 9987da4b5dcfc8b94b702d4bb94b30955eb73c75) Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/gpu/drm/i915/i915_gemfs.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/i915_gemfs.c b/drivers/gpu/drm/i915/i915_gemfs.c
index e2993857df37..888b7d3f04c3 100644
--- a/drivers/gpu/drm/i915/i915_gemfs.c
+++ b/drivers/gpu/drm/i915/i915_gemfs.c
@@ -52,7 +52,8 @@ int i915_gemfs_init(struct drm_i915_private *i915)
if (has_transparent_hugepage()) {
struct super_block *sb = gemfs->mnt_sb;
- char options[] = "huge=within_size";
+ /* FIXME: Disabled until we get W/A for read BW issue. */
+ char options[] = "huge=never";
int flags = 0;
int err;