On Wed, 22 Jun 2011 11:42:04 -0700 Eric Anholt <e...@anholt.net> wrote:
> On Tue, 21 Jun 2011 15:24:24 -0700, Jesse Barnes <jbar...@virtuousgeek.org> > wrote: > > The ring frequency scaling table tells the PCU to treat certain GPU > > frequencies as if they were a given CPU frequency for purposes of > > scaling the ring frequency. Normally the PCU will scale the ring > > frequency based on the CPU P-state, but with the table present, it will > > also take the GPU frequency into account. The scaling_factor used in > > this patch may not be ideal, but is enough to increase performance in > > nexuiz on a 1366x768 panel by about 20%. > > > > The main downside of keeping the ring frequency high while the CPU is > > at a low frequency (or asleep altogether) is increased power > > consumption. But then if you're keeping your GPU busy, you probably > > want the extra performance. > > The intent of the patch sounds good, but it doesn't seem to be doing > anything here (graphs below). If I run a "while true; do; done" loop to > keep a CPU busy during measurement, though, OA gets a 15.9% +/- 0.6% > win, and nexuiz around 20%. There are no complaints in dmesg. Ok I'll checck it out; I admit I tested it then made a few changes then sent it out, so I must have broken something... Jesse _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
