On Wed, 22 Jun 2011 12:29:21 +0800, "Zou, Nanhai" <nanhai....@intel.com> wrote:
> As I understand, > with movnti + sfence, data should be surly reach memory. Cache should be > coherent at this case. I wouldn't mind seeing additional experiments in this area, but when Eric and I tried this a couple of years ago, we found that without clflush, data would not reliably be forced out to memory. > > map_gtt in current gem is super slow. > I've tried map_gtt but it seems that the speed is unacceptable. You almost certainly want to allocate a couple of sufficient GTT mapped buffers and hang onto them; you'll call map_gtt only at startup, then re-use the buffers. > A fast map_gtt implementation could be the best choice here. Chris Wilson may have some ideas about how to speed up map_gtt, but I suspect the best plan is to not need to speed it up by re-using the same mapped buffers. -- keith.pack...@intel.com
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