Re: [Gems-users] "e_sendData" in MOESI_CMP_directory-L1cache.sm

["Hui Li" <lihui@xxxxxxxxxxxxxxxx>]

thank you:)
yes i think you are right and in this case the content of the Dirty flag may not
have any impact on the correctness...
regards,
lihui


ÔÚÄúµÄÀ´ÐÅÖÐÔø¾­Ìáµ½:
>From: Marco Solinas <marco.solinas@xxxxxxxxxxxx>
>Reply-To: 
>To: Hui Li <lihui@xxxxxxxxxxxxxxxx>, Gems Users <gems-users@xxxxxxxxxxx>
>Subject: Re: [Gems-users] "e_sendData" in MOESI_CMP_directory-L1cache.sm
>Date:Wed, 16 Apr 2008 11:00:35 +0200
>
>I've never worked with this protocol, but in my view (please correct me 
> if I'm wrong) it is correct because the request is a GETS, so a 
> non-exclusive read. The cache receiving the block will store it in the S 
> state, (transition(IS, Data, S){...}), so the block has not to be 
> considered dirty for the requesting node; instead, the dirty information 
> is still held by the sender cache, that changes the state from M to O. 
> In fact, when the Ownership changes (in case of a GETX forwarded to a 
> cache that holds a block in either M or O), the action used to provide 
> the requesting cache with the block is not e_sendData, instead it is 
> e_sendDataExclusive (transition(M, Fwd_GETX, I){...} and transition(O, 
> Fwd_GETX, I){...} for example). This action set the Dirty flag of the 
> outgoing message to the same value of the Dirty flag of the cache tag.
> 
> Marco
> 
> Hui Li ha scritto:
> > hello,
> > the action e_sendData in MOESI_CMP_directory-L1cache.sm always does this:
> >   out_msg.Dirty := false;
> > so it means that the contents in the cache entry are the same with memory.
> > however, in transition:
> >   transition(M, Fwd_GETS, O) {
> >     e_sendData;
> >     l_popForwardQueue;
> >   }
> > the Dirty flag should be true, right? or I missed some point?
> > regards,
> > lihui
> >
> >
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> 
>