[Intel-gfx] [PATCH igt] igt/gem_exec_latency: Wire up an interloper for preemption

[Petri Latvala]

On Thu, Oct 26, 2017 at 12:15:32PM +0100, Chris Wilson wrote:
> Quoting Michał Winiarski (2017-10-26 11:52:31)
> > On Thu, Oct 26, 2017 at 08:31:27AM +0100, Chris Wilson wrote:
> > > For measuring the cost of preemption, inject a low priority spinner
> > > between the two measurements; the difference between the preemption and
> > > the normal dispatch includes both the cost of the spinner dispatch and
> > > of preempting it. Close enough for us to estimate the cost of
> > > preemption, though we don't measure the cost of preemption on the local
> > > ring!
> > 
> > And as expected, we're seeing more delay with GuC, probably from worker
> > scheduling delay (~2ms on my SKL if I'm reading the results correctly).
> > 
> > Reviewed-by: Michał Winiarski <michal.winiarski at intel.com>

You forgot to... wait...

> And I forgot to copy'n'paste the r-b before pushing. The inquisition
> will be calling shortly.

B...b.b.but you're not supposed to expect the (spanish)
inquisition... =(



-- 
Petri Latvala