[Bug 102336] [BYT] Offscreen tests performance drops to <1/3 due to power management

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102336

Eero Tamminen <eero.t.tamminen at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |VERIFIED

--- Comment #8 from Eero Tamminen <eero.t.tamminen at intel.com> ---
(In reply to Chris Wilson from comment #7)
> Now fixed in x86/tip.

Verified, all the regressions are no fixed, thanks!


> If you want to report some details of the hang, otherwise there's not much I
> can do.

Was the issue BYT specific, like the related perf drop was?


> The reason why it suddenly became worse is all due to switching to
> modesetting, which only used rcs and so we end up interesting behaviour with
> X getting stuck behind extra frames, and not reporting the buffer as idle as
> early (so the client would be waiting on the CPU fence being signaled and
> not waiting on the GPU, so being invisible to the waitboost mechanism).
> Interesting effect.

Modesetting drop isn't BYT specific.

When Martin tested modesetting ~1 year ago against Intel DDX, modesetting was
same speed or slightly better in 3D cases (and lost in 2D ones).

However, now switching from Intel DDX to modesetting drops onscreen 3D
test-cases perf on all platforms for Unigine demos (on anything after BYT),
GfxBench test-cases and high FPS cases.

Any idea why?

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