Re: [Gems-users] cache size calculation

[Shoaib Altaf <shoaibbinalt@xxxxxxxx>]

I want to have 1 MB private L2 cache with 16 banks for each processor in a 
16 core CMP.
So which one is the right way to declare that,
either

L2_CACHE_ASSOC: 4
L2_CACHE_NUM_SETS_BITS :12
This will from a 1 MB cache but in the final report the modified value 
comes out to be less then 1 MB , which I believe is due to
L2_CACHE_NUM_SETS_BITS = L2_CACHE_NUM_SETS_BITS- 
log_int(g_NUM_L2_BANKS_PER_CHIP) (RubyConfig.C:137)
or

L2_CACHE_ASSOC: 4
L2_CACHE_NUM_SETS_BITS :16

Regards
Shoaib


--------------------------------------------------
From: "Abdullah Kayi" <apokayi@xxxxxxxxxxxxxx>
Sent: Sunday, April 12, 2009 9:05 PM
To: "Gems Users" <gems-users@xxxxxxxxxxx>
Subject: Re: [Gems-users] cache size calculation

> Shoaib Altaf wrote:
> > Hi,
> >
> > Are there any other parameters to be specified while designing the
> > size of a cache other then the following
> >
> > LI_CACHE_ASSOC: 4
> > L1_CACHE_NUM_SETS_BITS :8
> >
> > How these configurations make the size of the L1 cache to  be 64 KB in
> > the statistics below.
> It should be something like this:
>
> 2^8 = 256 is the # of sets
>
> Cache Size = (# of sets) * (# of blocks / set) * (# of bytes / block)
> Cache Size = 256 * 4 (cache associativity) * 64 (or cache line size) = 64 
> KB
> ~ AK
> > num_cache_set: 256
> > cache_size_Kbytes: 64
> >
> > Muhammad Shoaib
> > ------------------------------------------------------------------------
> >
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