On Thu, 23 Jun 2011 21:08:02 +0100 Chris Wilson <ch...@chris-wilson.co.uk> wrote:
> On Thu, 23 Jun 2011 10:11:26 -0700, Jesse Barnes <jbar...@virtuousgeek.org> > wrote: > > I tested again and things were working as expected. This patch adds a > > debugfs file for dumping the ring freq table, can you guys test it out > > (try disabling the call to update the table, dump it, make sure it's 0, > > then re-enable and make sure it's programmed correctly). > > According to the debugfs, your defaults should be effective: > > sandybridge:~$ cat /sys/kernel/debug/dri/1/i915_ring_freq_table > GPU freq Effective CPU freq > 850 0 -> 1600 > 900 0 -> 1700 > 950 0 -> 1800 > 1000 0 -> 1800 > 1050 0 -> 1900 > 1100 0 -> 2000 > > I'll give the tyres another kick and see if I can spot any differences. Eric was seeing an increase, but not as large as expected or hoped for. He saw a greater increase in performance than this patch provides by simply keeping the CPU busy during his benchmark. That could be due to additional ring frequency when the CPU is in a turbo mode. You may be able to approach that by making the effective CPU frequency much higher (maybe going up to 4GHz). -- Jesse Barnes, Intel Open Source Technology Center _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
