[Bug 109055] ~10% perf drop in Sascha Willems Vulkan Multithreading demo

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109055

--- Comment #1 from Eero Tamminen <eero.t.tamminen at intel.com> ---
There was some change between following commits:
* 2018-12-31 19:52:08 8c93ef5de9: radv: Do a cache flush if needed before
reading predicates.
* 2019-01-02 18:09:04 7d6babf995: nir: add a way to print the deref chain

That changed the multithreading test perf:
* Fixed half of KBL-7 GT2 regression
* Fixed half of combined perf regression for SKL-i5 GT2, for the indicated
interval, and another (as large) regression at end of November
* Improved perf a lot on BDW-3 GT2, much more than the small regression

GPU still spends significant time in RC6 (~20% on BDW-i3, 35-40% on SKL-i5, 45%
on KBL-i7).  CPU vs GPU power usage changes differ between platforms, but
they're fairly small.  All in all, pretty nice with clearly increased perf.

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