From 86bd3fd864a8383e1d6823114da422f6a948bf1e Mon Sep 17 00:00:00 2001 From: Kenneth Graunke Date: Tue, 17 Jan 2017 17:18:01 -0800 Subject: [PATCH] i965: Use async maps for BufferSubData to regions with no valid data. When writing a region of a buffer via glBufferSubData(), we can write the data asynchronously if the destination doesn't contain any data. Even if it's busy, the data was undefined, so the new data is fine too. Removes all stall avoidance blits on BufferSubData calls in "Total War: WARHAMMER" on my Skylake GT4. Decreases the number of stall avoidance blits in Manhattan 3.1: - Skylake GT4: -18.3544% +/- 6.76483% (n=13) - Apollolake: -12.1095% +/- 5.24458% (n=13) Reviewed-by: Jason Ekstrand --- src/mesa/drivers/dri/i965/intel_buffer_objects.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/src/mesa/drivers/dri/i965/intel_buffer_objects.c b/src/mesa/drivers/dri/i965/intel_buffer_objects.c index ff73a37d608..a335c00afde 100644 --- a/src/mesa/drivers/dri/i965/intel_buffer_objects.c +++ b/src/mesa/drivers/dri/i965/intel_buffer_objects.c @@ -234,7 +234,9 @@ brw_buffer_subdata(struct gl_context *ctx, * up with blitting all the time, at the cost of bandwidth) */ if (offset + size <= intel_obj->gpu_active_start || - intel_obj->gpu_active_end <= offset) { + intel_obj->gpu_active_end <= offset || + offset + size <= intel_obj->valid_data_start || + intel_obj->valid_data_end <= offset) { void *map = brw_bo_map(brw, intel_obj->buffer, MAP_WRITE | MAP_ASYNC); memcpy(map + offset, data, size); brw_bo_unmap(intel_obj->buffer); -- 2.30.2