[Intel-gfx] [PATCH] drm/i915: Support to create uncached user mapping for a Gem object

[Chad Versace]

On 10/23/2014 06:23 AM, Chris Wilson wrote:
> On Thu, Oct 23, 2014 at 12:56:46PM +0100, Chris Wilson wrote:
>> On Thu, Oct 23, 2014 at 04:03:56PM +0530, akash.goel at intel.com wrote:
>>> From: Akash Goel <akash.goel at intel.com>
>>>
>>
>>> This is for improving the CPU write operation performance, as with such
>>> mapping, writes are almost 50% faster than with mmap_gtt. Also it avoids the


> Oops, bugs beware. I wasn't calling the ioctl correctly.
> Having re-run the test, I now get:
> 
>    gtt       wc    Operation
> --------  ------   ---------
> 424000.0    1.30   ShmPutImage 10x10 square 
>  29500.0    1.44   ShmPutImage 100x100 square 
>   1510.0    1.38   ShmPutImage 500x500 square 
> 
> Supporting your claims. Very nice.

What are the units for these numbers?

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