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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2011-03-04 18:48:03 +0000 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2011-03-07 11:00:59 +0000 |
| commit | a1656b9090f7008d2941c314f5a64724bea2ae37 (patch) | |
| tree | 7fec97b2bff698d6d5d952e6c0ae0950488e9fc2 /drivers/gpu/drm/i915/i915_drv.h | |
| parent | 91355834646328e7edc6bd25176ae44bcd7386c7 (diff) | |
| download | kernel_samsung_smdk4412-a1656b9090f7008d2941c314f5a64724bea2ae37.zip kernel_samsung_smdk4412-a1656b9090f7008d2941c314f5a64724bea2ae37.tar.gz kernel_samsung_smdk4412-a1656b9090f7008d2941c314f5a64724bea2ae37.tar.bz2 | |
drm/i915: Disable GPU semaphores by default
Andi Kleen narrowed his GPU hangs on his Sugar Bay (SNB desktop) rev 09
down to the use of GPU semaphores, and we already know that they appear
broken up to Huron River (mobile) rev 08. (I'm optimistic that disabling
GPU semaphores is simply hiding another bug by the latency and
side-effects of the additional device interaction it introduces...)
However, use of semaphores is a massive performance improvement... Only
as long as the system remains stable. Enable at your peril.
Reported-by: Andi Kleen <andi-fd@firstfloor.org>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=33921
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Diffstat (limited to 'drivers/gpu/drm/i915/i915_drv.h')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_drv.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 549c046..d023b9b 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -956,6 +956,7 @@ extern struct drm_ioctl_desc i915_ioctls[]; extern int i915_max_ioctl; extern unsigned int i915_fbpercrtc; extern unsigned int i915_powersave; +extern unsigned int i915_semaphores; extern unsigned int i915_lvds_downclock; extern unsigned int i915_panel_use_ssc; extern unsigned int i915_enable_rc6; |