[Intel-gfx] [PATCH i-g-t] lib/i915: Trim ring measurement by one

[Mika Kuoppala]

Chris Wilson <chris at chris-wilson.co.uk> writes:

> Quoting Mika Kuoppala (2019-08-12 12:52:56)
>> Chris Wilson <chris at chris-wilson.co.uk> writes:
>> 
>> > Be a little more conservative in our ring measurement and exclude one
>> > batch to leave room in case our user needs to wrap (where a request will
>> > be expanded to cover the unused space at the end of the ring).
>> >
>> 
>> did read the wrapping part and that seems to be the case that
>> we enlarge the wrapping request.
>> 
>> However do we lose some coverage on the actual wrap tests?
>
> The tests where we call measure_ring_size, are those that we do not want
> to block due to running out of space (and wrapping) :)

Ok. The bugs on the wrap itself should bubble to surface
indirectly. Agreed that estimating the inflight wrong
is bad.

Reviewed-by: Mika Kuoppala <mika.kuoppala at linux.intel.com>