[Intel-gfx] [PATCH] drm/i915: set scan-buffer as uncached on Sandybridge

[Zou, Nanhai]

>>-----Original Message-----
>>From: intel-gfx-bounces+nanhai.zou=intel.com at lists.freedesktop.org
>>[mailto:intel-gfx-bounces+nanhai.zou=intel.com at lists.freedesktop.org] On
>>Behalf Of Clemens Eisserer
>>Sent: 2010年10月25日 18:31
>>To: intel-gfx
>>Subject: Re: [Intel-gfx] [PATCH] drm/i915: set scan-buffer as uncached on
>>Sandybridge
>>
>>Hi,
>>
>>>        We only need front buffer to be uncached.
>>>        I think that will not affect performance since GPU will seldom read
>>back from front buffer.
>>>        We will measure performance on that.
>>
>>At least here I have a couple of apps reading back from frontbuffer,
>>and performance on i945+2.13 is horrible.
>>No idea if it would be worse on SandyBridge if access is uncached, but
>>even slower would *really* hurt.

Are you reading back from CPU or GPU?

Thanks
Zou Nan hai

>>
>>- Clemens
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