Re: [Gems-users] GETS request in MOESI Directory Protocol

[Kevin Moore <kmoore@xxxxxxxxxxx>]

James,
	this is an optimization to improve lock handoffs and other migratory 
sharing.  The assumption is that blocks that are modified by one 
processor are likely to be modified by another.  So, the protocol hands 
the data off in exclusive mode.
--Kevin


On Feb 23, 2006, at 4:39 PM, James Wang wrote:

> Hi Guys:
> 	I am working on some modification of the
> MOESI_SMP_directory-cache.sm file in the protocol folder. I notice 
> that the
> following transition
>    transition(MM, Fwd_GETS, I) {
>     ee_sendDataExclusive;
>     l_popForwardQueue;
>   }
>  is kind of weird because I would expect it to go to O or S state 
> rather
> than I sate. Could anyone explain to me why?
> Regards
> James Wang
>
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