Currently we insert a arbitration point every 128MiB during a blitter
copy. At 8GiB/s, this is around 30ms. This is a little on the large side
if we need to inject a high priority work, so reduced it down to 8MiB or
roughly 1ms.
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.a...@intel.com>
---
Ok, I need to do a selftest to ensure we are exceeding the estimated
blitter throughtput, and I would also like a test to measure the
preemption latency directly. Remind me!
---
drivers/gpu/drm/i915/gem/i915_gem_object_blt.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object_blt.c
b/drivers/gpu/drm/i915/gem/i915_gem_object_blt.c
index 516e61e99212..7e25f05939bc 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object_blt.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object_blt.c
@@ -17,7 +17,7 @@ struct i915_vma *intel_emit_vma_fill_blt(struct intel_context
*ce,
u32 value)
{
struct drm_i915_private *i915 = ce->vm->i915;
- const u32 block_size = S16_MAX * PAGE_SIZE;
+ const u32 block_size = SZ_8M; /* ~1ms at 8GiB/s preemption delay */
struct intel_engine_pool_node *pool;
struct i915_vma *batch;
u64 offset;
--
2.24.0.rc1
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