On Wed, Oct 23, 2013 at 09:47:30AM -0500, Jay Cornwall wrote: > On 2013-10-22 21:05, Tom Stellard wrote: > > > --- > > src/gallium/drivers/radeonsi/radeonsi_compute.c | 15 ++++++++++++--- > > 1 file changed, 12 insertions(+), 3 deletions(-) > > > [..] > > + si_pm4_set_reg(pm4, R_00B82C_COMPUTE_MAX_WAVE_ID, > > + 0x190 /* Default value */); > > Is there any visible effect on performance if this is set very low? >
I haven't tested with any other values. > If there is, perhaps we should compute this value for SI. I think all > the necessary parameters are provided by DRM (MAX_SE * MAX_SH_PER_SE * > MAX_PIPES * 40 wavefronts per CU, off the top of my head). The formula from the comment is: (number of compute units) * 4 * (waves per simd) - 1 I think this may be a simplified version of your formula. -Tom > > -- > Jay Cornwall > _______________________________________________ > mesa-dev mailing list > mesa-dev@lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/mesa-dev _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev
