[Intel-gfx] [PATCH i-g-t] amdgpu/amd_prime: Reduce setup time

[Daniel Vetter]

On Wed, Jul 04, 2018 at 01:38:23PM +0100, Chris Wilson wrote:
> If we allow 5s (+20% systematic error) to construct the fences, we may
> reasonably assume that it will take equally as long to consume them. As
> we only have 10s before the vgem fence times out, there is no margin of
> safety.
> 
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> ---
>  tests/amdgpu/amd_prime.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tests/amdgpu/amd_prime.c b/tests/amdgpu/amd_prime.c
> index bb68ccf31..6c64c3af9 100644
> --- a/tests/amdgpu/amd_prime.c
> +++ b/tests/amdgpu/amd_prime.c
> @@ -348,7 +348,7 @@ static void amd_to_i915(int i915, int amd, amdgpu_device_handle device)
>  	count = 0;
>  	size = 64 << 10;
>  	contexts = malloc(size * sizeof(*contexts));
> -	igt_until_timeout(5) {
> +	igt_until_timeout(2) {

Might be good to put a "need to beat the vgem timeout of 10s" or similar
comment here. Even fancier would be a bit of igt library to create vgem
plugs and later on in the could put an igt_assert_still_plugged() to make
sure we've hit the race fully. Would also be some piece of really nice
self-documenting code.

Either way: Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>


>  		if (count == size) {
>  			size *= 2;
>  			contexts = realloc(contexts, size * sizeof(*contexts));
> -- 
> 2.18.0
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch