METHOD AND APPARATUS FOR FILTERING SNOOP REQUESTS USING STREAM REGISTERS
    8.
    发明公开
    METHOD AND APPARATUS FOR FILTERING SNOOP REQUESTS USING STREAM REGISTERS 有权
    方法和装置滤波SNOOP要求使用功率寄存器

    公开(公告)号:EP1864224A4

    公开(公告)日:2011-08-10

    申请号:EP06739000

    申请日:2006-03-17

    Applicant: IBM

    CPC classification number: G06F12/0831 G06F12/0822 G06F2212/507 Y02D10/13

    Abstract: A method and apparatus for supporting cache coherency in a multiprocessor computing environment having multiple processing units, each processing unit having a local cache memory associated therewith. A snoop filter device is associated with each processing unit and includes at least one snoop filter primitive implementing filtering method based on usage of stream registers sets and associated stream register comparison logic. From the plurality of stream registers sets, at least one stream register set is active, and at least one stream register set is labeled historic at any point in time. In addition, the snoop filter block is operatively coupled with cache wrap detection logic whereby the content of the active stream register set is switched into a historic stream register set upon the cache wrap condition detection, and the content of at least one active stream register set is reset. Each filter primitive implements stream register comparison logic that determines whether a received snoop request is to be forwarded to the processor or discarded.

Patent Agency Ranking