[Bug 82808] [IVB/BYT-M/BDW] Unigine-Heaven4.0 on IVB/BYT-M/BDW performance is slower(=?UTF-8?Q?=E2=86=932x?=) ) than HSW_GT3e.

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Fri Aug 22 00:24:30 PDT 2014


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

           What    |Removed                     |Added
             Status|NEW                         |NEEDINFO

--- Comment #3 from Eero Tamminen <eero.t.tamminen at intel.com> ---
> Unigine-Heaven4.0 on IVB/BYT-M/BDW very slower(↓2x) than HSW_GT3e, this issue doesn’t exist on Unigine-Heaven3.0.

Heaven (v4) is memory BW bound and GT3e has more of that (with its 128MB L4)
than IVB/BYT/BDW devices have have currently so Heaven being clearly faster on
it is to be expeced.

Are you saying that Heaven v3 is same speed on GT3e as it's on BYT?  If it's
system memory bandwidth bound (= memory accesses don't fit into L4), I can buy
it being fairly same speed as on IVB & BDW as the devices we currently have,
have same bandwidth.  However, if BYT is same speed, that is definitely wrong.

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