[Bug 87725] [BDW] OglBatch7 performance reduced by ~7% after enable execlists

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87725

--- Comment #23 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to Eero Tamminen from comment #22)
> I wonder what impact resource streamer would have on this?
> 
> (This is not a request to add RS, as it goes away in newer GENs, but I know
> that Windows uses it, so I was just wondering how much impact you think it
> would have had.)

Overall, none. RS afaik is the same for both submission paths; the effect
causing the slowdown is the order of magnitude increased latency in both the
initial submission and effectively doing a context switch every time (waking
up, reprogramming ELSP, which in turn triggers another wakeup in a few
microseconds, repeat until steady state is achieved, then start again at the
end of the batch).

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