Re: [Gems-users] Cache sizes in CMP

[Mike Marty <mikem@xxxxxxxxxxx>]

> L2Cache_L2cacheMemory numberPerChip: 4
> Cache config: L2Cache_0_L2
>  cache_associativity: 4
>  num_cache_sets_bits: 9
>  num_cache_sets: 512
>  cache_set_size_bytes: 32768
>  cache_set_size_Kbytes: 32
>  cache_set_size_Mbytes: 0.03125
>  cache_size_bytes: 131072
>  cache_size_Kbytes: 128
>  cache_size_Mbytes: 0.125
>
>
> i'm simulating a CMP with 4 cores per chip. My question is, what is the
> total cache size? 128 KB or 128 KB per core (512 KB in total)?
The way it is currently coded, we specify the total cache size with the 
L2_CACHE_NUM_SETS_BITS (and associativity), but in RubyConfig.C, this is 
divided by the number of L2 banks per chip.
 L2_CACHE_NUM_SETS_BITS = L2_CACHE_NUM_SETS_BITS - 
log_int(g_NUM_L2_BANKS_PER_CHIP);
Thus you should be simulating 512 KB total