Quoting Chris Wilson (2017-12-18 21:47:25) > Quoting Jackie Li (2017-12-18 21:22:08) > > From: Zhipeng Gong <zhipeng.gong@xxxxxxxxx> > > > > SKL platforms requires a higher ring multiplier when there's massive > > GPU load. Current driver doesn't provide a way to override the ring > > multiplier. > > > > This patch adds a new module parameter to allow the overriding of > > ring multiplier for Gen9 platforms. > > So the default ring-scaling is not good enough, the first thing we do is > to try and ensure the defaults work for nearly all use cases. My > impression is that you want a nonlinear scalefactor, low power workloads > don't try and ramp up the ring frequencies as aggressively, high power > workloads try hard for higher frequencies, and then get throttled back > harder as well. How well can we autotune it? What events tells us if the > ratio is too high or too low? One thing that came to mind is that we don't know the min/max ring frequencies and just program them blindly. Is it the case that at max gpu freq, there is still headroom on the ring freq, or do you require a steeper ramp so that you hit the max ringfreq earlier for your workload (which then presumably can run at less than max gpufreq, so pushing power elsewhere). -Chris _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
