On Mon, Aug 26, 2013 at 07:51:08PM -0300, Rodrigo Vivi wrote: > From: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > > If we encounter a situation where the CPU blocks waiting for results > from the GPU, give the GPU a kick to boost its the frequency. > > This should work to reduce user interface stalls and to quickly promote > mesa to high frequencies - but the cost is that our requested frequency > stalls high (as we do not idle for long enough before rc6 to start > reducing frequencies, nor are we aggressive at down clocking an > underused GPU). However, this should be mitigated by rc6 itself powering > off the GPU when idle, and that energy use is dependent upon the workload > of the GPU in addition to its frequency (e.g. the math or sampler > functions only consume power when used). Still, this is likely to > adversely affect light workloads. > > Stéphane raised the concern that this will punish good applications and > reward bad applications - but due to the nature of how mesa performs its > client throttling, I believe all mesa applications will be roughly > equally affected. > > RFM - request for measurement! > > Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > Cc: Kenneth Graunke <kenneth@xxxxxxxxxxxxx> > Cc: Stéphane Marchesin <stephane.marchesin@xxxxxxxxx> > Cc: "Meng, Mengmeng" <mengmeng.meng@xxxxxxxxx> > Cc: "Zhuang, Lena" <lena.zhuang@xxxxxxxxx> This patch is superseded by later versions. -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
