mem: Add snoop filters to L2 crossbars, and check size
Review Request #3060 - Created Aug. 21, 2015 and submitted
| Information | |
|---|---|
| Andreas Hansson | |
| gem5 | |
| default | |
| Reviewers | |
| Default | |
Changeset 11063:c64bbbe67e13 --------------------------- mem: Add snoop filters to L2 crossbars, and check size This patch adds a snoop filter to the L2XBar. For now we refrain from globally adding a snoop filter to the SystemXBar, since the latter is also used in systems without caches. In scenarios without caches the snoop filter will not see any writeback/clean evicts from the CPU ports, despite the fact that they are snooping. To avoid inadvertent use of the snoop filter in these cases we leave it out for now. A size check is added to the snoop filter, merely to ensure it does not grow beyond the total capacity of the caches above it. The size has to be set manually, and a value of 16 MByte is choosen as suitably high default.
Is this really snooping? The more I read this code, the more it feels
that snoop filter is really a directory and that it should be rechristened.