On 30/05/2014 14:19, Andreas Gal wrote: > Now for Intel hardware being slow there could be a couple reasons, and APZ > might fix them actually. If I remember correctly Atom GPUs are PowerVR based, > which is a tile based rendering architecture. It splits the frame buffer in > small tiles and renders those. To do this efficiently it defers rendering for > as long as possible. Other GPUs start rendering as soon as possible, whereas > PowerVR waits until the entire frame is ready and then renders it then. We do > a couple operations while rendering that might force a pipeline flush, which > likely forces PowerVR to render right away, which is very bad for PowerVR’s > particular render model. If you can point us to some specific hardware we > really suck on we can definitely look into this.
The test in https://bugzilla.mozilla.org/show_bug.cgi?id=894128#c30 is using an HD4000 iGPU which is an internal Intel design and not PowerVR-based. Has anybody tried using a Intel's Graphics Performance Analyzer [1] tools to see if we're hitting a slow path in the driver or some other suboptimal scenario? Gabriele [1] https://software.intel.com/en-us/vcsource/tools/intel-gpa
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