Re: [Gems-users] Questions about MOESI_CMP_directory

[Mike Marty <mikem@xxxxxxxxxxx>]

> We have seen that the PerfectCacheMemory in the L2
> acts as a directory cache and avoids to store the
> blocks in L2 that are in a L1. However since it's
> perfect cache it does not seem to be designed to be
> implemented in real systems. Does it?
> Is it suposed to be fully associative?
>

No, it approximates something like L1 shadow tags (or a simpler
structure).

The L2 is non-inclusive, however the L2 needs full knowledge of the L1
sharers.  It is not fully associative.

--Mike