发明名称 |
Apparatus for identifying memory requests originating on remote I/O devices as noncacheable |
摘要 |
An apparatus for identifying memory requests originating on remote I/O devices as non-cacheable in a computer system with multiple processors includes a main memory, memory cache, processor, cache coherence directory and cache coherence controller all coupled to a host bridge unit (North bridge). The I/O device transmits requests for data to an I/O bridge unit. The I/0 bridge unit forwards the request for data to the host bridge unit and asserts a sideband signal to the host bridge unit if the request is for non-cacheable data. The sideband signal informs the host bridge unit that the memory request is for non-cacheable data and that the cache coherence controller does not need to perform a cache coherence directory lookup. For cacheable data, the cache coherence controller performs a cache coherence directory lookup to maintain the coherence of data stored in a plurality of processor caches in the computer system.
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申请公布号 |
US2002087803(A1) |
申请公布日期 |
2002.07.04 |
申请号 |
US20000751505 |
申请日期 |
2000.12.29 |
申请人 |
JONES PHILLIP M.;WOODS ROBERT L. |
发明人 |
JONES PHILLIP M.;WOODS ROBERT L. |
分类号 |
G06F12/08;(IPC1-7):G06F12/08 |
主分类号 |
G06F12/08 |
代理机构 |
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