Since we don't guarantee that objects stay at the same gtt offset, userspace needs to reload all indirect state anyway, even with hw contexts. The hw provides a little pipe_control flag to disable at least some these indirect state pointers and hence avoid to save/restore them at context switch time.
Seems to improve hw context switch throughput as measured by running glxgears by about 0.5%, barely above the noise on my ivb gt2 here. Signed-Off-by: Daniel Vetter <[email protected]> --- drivers/gpu/drm/i915/intel_ringbuffer.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index f52778f..bc95142 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -228,6 +228,7 @@ gen6_render_ring_flush(struct intel_ring_buffer *ring, flags |= PIPE_CONTROL_VF_CACHE_INVALIDATE; flags |= PIPE_CONTROL_CONST_CACHE_INVALIDATE; flags |= PIPE_CONTROL_STATE_CACHE_INVALIDATE; + flags |= PIPE_CONTROL_INDIRECT_STATE_DISABLE; if (IS_GEN7(ring->dev)) flags |= PIPE_CONTROL_DC_CACHE_FLUSH; /* -- 1.7.10.4 _______________________________________________ Intel-gfx mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/intel-gfx
