[Gems-users] question on silence drop

["Liqun Cheng" <liqun.cheng@xxxxxxxxx>]

Hi,

I am confused about the transition in MOESI_SMP_directory-cache.sm,
line 835. Why a clean line (E state) needs to be written back?
transition({E, M}, L2_Replacement, MI) {
    i_allocateTBE;
    d_issuePUTX;
    rr_deallocateL2CacheBlock;
  }

BTW, what's the difference between M and MM (locally modified)?

thanks
Liqun