Heikki Kultala (heikk.i.kultal.a.delete@this.gmail.com) on April 9, 2021 12:57 pm wrote:
> Robert Williams (crispysilicon.delete@this.gmail.com) on April 9, 2021 11:24 am wrote:
> > Heikki Kultala (heikki.kulta.la.delete@this.gmail.com) on April 8, 2021 11:09 pm wrote:
> > > Mark Roulo (nothanks.delete@this.xxx.com) on April 8, 2021 11:31 am wrote:
> > > > Heikki Kultala (heikki.ku.ltala.delete@this.gmail.com) on April 7, 2021 12:38 pm wrote:
> > > > ...
> > > > > And Intel has it's SRAM-based LLC working as L4 cache for their iGPUs for ages.
> > > >
> > > > FYI, the L4 cache that Intel shipped with some of its IGPUs was eDRAM, not SRAM.
> > >
> > > No.
> > >
> > > There is one cache level more for the iGPU than CPU.
> > >
> > > What is L3 for CPU is L4 for GPU.
> > >
> > >
> > >
> >
> > The CPU uses the L4 very happily in the presence on an external GPU.
>
> I am not talking about the Crystall Well eDRAM.
>
> I am talking about the LLC SRAM that is in the same die as the cores, in EVERY intel Core-series CPU.
>
> That cache is L3 for the CPU, but L4 for the GPU.

cf
https://patents.google.com/patent/US9280471B2/