Thanks a lot for all these information.
--
Hemayet
On Wed, 18 Oct 2006, Mike Marty wrote:
Thanks.
yes, actually It stalls (not recycle) the the mandatory queue. I guess
this is for in order requirement (mandatory queue is a FIFO). right?
MOESI_CMP_directory uses recycles instead so that other mandatory queue
requests can be processed while one is stalled.
I would think the same thing could (and should) be done for
MSI_MOSI_CMP_directory.
On the other hand, the only time a request is stalled in the mandatory
queue is if something else is already going on for the same block (like a
replacement, or a conflicting request for the same block address). This
should be very rare, so MLP (memory-level parallelism) is not really
impacted by this implementation decision of using z_stall.
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