On Mon, 27 Jun 2011 20:40:08 +0100 Chris Wilson <[email protected]> wrote:
> On Fri, 24 Jun 2011 11:13:14 -0700, Jesse Barnes <[email protected]> > 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. > > So it wasn't picking up max-cpu-freq even though I have CONFIG_CPU_FREQ > and the various ACPI and Intel cpu drivers. > > Taking a hint from x86/kvm, I used tsc_khz instead of the default 3000. > > nexuiz @10x7 nopatch -> 3000 -> 3300 [tsc_khz] > uncached: 43.2 44.4 44.8 > llc: 51.3 52.3 > > At max_freq=3000, a cpu busy loop was still able to nudge it up to the > same speed as using the max_freq=3300 value. Ok tsc_khz is a good fallback, thanks. -- Jesse Barnes, Intel Open Source Technology Center _______________________________________________ Intel-gfx mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/intel-gfx
