nVidia Fermi has ~192KB on-chip memory per SM

Article: AMD Fusion Architecture and Llano
By: Gionatan Danti (g.danti.delete@this.assyoma.it), September 2, 2011 9:18 am
Room: Moderated Discussions
Gabriele Svelto (gabriele.svelto@gmail.com) on 9/2/11 wrote:
---------------------------
>Gionatan Danti (g.danti@assyoma.it) on 9/2/11 wrote:
>---------------------------
>>While texture are nowadays quite big in size, they don't need to be cache all at
>>once: think about the very small (and fast) L1 texture cache that reside in each
>>AMD SIMD array. In the general case, even big texture processing has a quite good
>>locality to exploit (think about the use of small mipmaps).
>
>The locality of reference caught by those very small caches is almost entirely
>related to filtering. Adjacent pixels are likely to tap the same texel a few times
>because of filtering but that's about it. The way they are designed - extremely
>small, highly associative and potentially holding duplicate data kept in other caches
>- shows that they are dedicated to this specific task (catching filters' inherent
>locality) and nothing else. Turning them into a larger shared pool already already
>proved to be a terrible idea. R600 was a good example of this, even though it didn't
>have a shared pool the TUs caches were shared between the SIMDs to improve utilization
>and reduce duplicated data... we all know how that ended up and R700 shipped with dedicated per-SIMD texel caches.

You are right about R600, but a L2 texture cache was used in successive chips as RV770, RV870 and Cayman. What I mean is that maybe Intel is not using any (or very small) GPU-level L2 cache, relaying instead on the share L3 cache. This is just an idea, thought.
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                                        nVidia Fermi has ~192KB on-chip memory per SMMark Roulo2011/08/30 08:32 AM
                                          nVidia Fermi has ~192KB on-chip memory per SMEduardoS2011/08/30 02:19 PM
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                                            nVidia Fermi has ~192KB on-chip memory per SMGionatan Danti2011/09/01 02:30 AM
                                              nVidia Fermi has ~192KB on-chip memory per SMAnon2011/09/02 02:45 AM
                                                nVidia Fermi has ~192KB on-chip memory per SMGionatan Danti2011/09/02 07:06 AM
                                                  nVidia Fermi has ~192KB on-chip memory per SMGabriele Svelto2011/09/02 09:00 AM
                                                    nVidia Fermi has ~192KB on-chip memory per SMGionatan Danti2011/09/02 09:18 AM
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