I see that an 18 EU Apollo Lake SKU like the N4200 may appear as either 3 sub-slices of 6 EUs (with 6 hardware threads per EU) *or* as 2 virtual sub-slices of 9 EUs.
As a developer, what should my mental model be when programming this device?
Does the Windows driver implement "Legacy Mode" 3x6 EU sub-slices or the new virtual 2x9 EU configuration?
How much SLM is available to each sub-slice in either mode?
This doc makes Legacy Mode sound ominous: https://01.org/sites/default/files/documentation/intel-gfx-prm-osrc-bxt-...
This doc is useful too: https://01.org/sites/default/files/documentation/intel-gfx-prm-osrc-bxt-...