RE: [Gems-users] Modify Cache Parameters to get rid of L2 cache

["Mike Marty" <mikem@xxxxxxxxxxx>]

If you don't care about split I&D L1 caching, then just use
MOSI_SMP_bcast_1level which is a single cache per processor.  

Otherwise use MOSI_SMP_bcast which manages an L1 I&D and L2 in the same
controller.  However I'm not sure how it will behave with the L2 cache set
as 0 and in fact we have an assertion, in ruby/RubyConfig.C, to enforce that
there is at least 1 set for L2 cache bank.  Would setting the cache size to
a single set be good enough?  If not, modify MOSI_SMP_bcast_1level-cache.sm
to have split L1 caches.  This should be pretty straightforward by comparing
the differences between MOSI_SMP_bcast-cache.sm and
MOSI_SMP_bcast_1level-cache.sm

Regarding setting different associativities for the L1 I&D caches, this
should be pretty straightforward.  You will need to modify the
MOSI_SMP_bcast-cache.sm file so that it uses a different parameter when
instantiating the 2 L1 cache memories (search for "CacheMemory").  


> -----Original Message-----
> From: gems-users-bounces@xxxxxxxxxxx [mailto:gems-users-
> bounces@xxxxxxxxxxx] On Behalf Of adash@xxxxxxx
> Sent: Saturday, June 11, 2005 3:44 PM
> To: gems-users@xxxxxxxxxxx
> Subject: [Gems-users] Modify Cache Parameters to get rid of L2 cache
> 
> I want to generate statistics using the ruby module for the
> following
> configuration
> 
> a.there is no L2 cache
> b.32K 2-way set associative L1 cache and 32K direct-mapped L1
> cache
> c.number of processors :4
> d.PROTOCOL:MOSI_SMP_bcast
> e.The benchmarks are Splash benchmark FFT
> 
> I changed the cache configurations in the
> /GEMS/ruby/config/rubyconfig.defaults
> file by setting the L2 cache lines to 0 as shown below however
> I do not see any change in the
> new stats files.
> 
> L1_CACHE_ASSOC: 2
> L1_CACHE_NUM_SETS_BITS: 8
> L2_CACHE_ASSOC: 0
> L2_CACHE_NUM_SETS_BITS: 0
> 
> Could anyone please point out which other files need to be
> change to achieve the objective? or what
> is the best way to do this.
> 
> Thanks a lot for your help
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