[Bug 84662] Long pauses with Unreal demo Elemental on R9270X since : Always flush the HDP cache before submitting a CS to the GPU

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Comment # 5 on bug 84662 from smoki

(In reply to Andy Furniss from comment #3)
> Created attachment 107327 [details]
> gallium hud on bad showing different vram gtt usage

 Hmm whatever GTT starts fueling fps gows down to crawl... I can't run
Elemental on Kabini have just 1-3 fps :D , but i am curios what happens for you
in HUD when you just comment out this in r600_buffer_common.c:

    default:
        /* Not listing GTT here improves performance in some apps. */
        res->domains = RADEON_DOMAIN_VRAM;
//        flags |= RADEON_FLAG_GTT_WC;
        break;
    }

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