[Intel-gfx] [PATCH 1/2] split render engine batch buffer and BLT engine

[Zou, Nanhai]

>>-----Original Message-----
>>From: Chris Wilson [mailto:chris at chris-wilson.co.uk]
>>Sent: 2010年10月26日 16:38
>>To: Zou, Nanhai; Zou, Nanhai; intel-gfx at lists.freedesktop.org
>>Subject: RE: [Intel-gfx] [PATCH 1/2] split render engine batch buffer and BLT
>>engine
>>
>>On Tue, 26 Oct 2010 16:31:47 +0800, "Zou, Nanhai" <nanhai.zou at intel.com> wrote:
>>> Even if we can implement the batch buffer in a modal way.
>>> I think it is not the best usage model.
>>> Render engine and BLT engine are separate engines on gen6+.
>>> For them to run one by one will not maximum the GPU usage.
>>
>>What usage pattern are you designing for? The most common pattern I've
>>seen is for short intermixed operations on a connected set of buffers. So
>>just what is the average length of the concurrent batch buffers (with
>>correct inter-ring flushing) versus a much simpler modal approach?
>>
>>And do you have any x11perf figures yet?
>>-Chris

I don't have x11perf result yet.
We have also discussed about the cache coherence design on gen6+.
There are 4 kinds of ring on gen6+ used by different engines, also now CPU and GPU share the last level cache. So we may need a better cache synchronize mechanism. 

Thanks
Zou Nan hai

>>
>>--
>>Chris Wilson, Intel Open Source Technology Centre