Electrical computers and digital processing systems: memory – Storage accessing and control – Hierarchical memories
Patent
1994-02-14
2000-04-11
An, Meng-Ai T.
Electrical computers and digital processing systems: memory
Storage accessing and control
Hierarchical memories
711142, 711143, 711144, 711146, 712 1, 712 32, G06F 934
Patent
active
06049851&
ABSTRACT:
A double cache snoop mechanism in uniprocessor computer systems having a cache and coherent I/O and multiprocessor computer systems reduces the number of cycles that a processor is stalled during a coherency check. The snoop mechanism splits each coherency check, such that a read-only check is first sent to the cache subsystem., and a read-write check is sent thereafter only if there is a cache hit during the read-only check, and there is the need to modify the cache. Average processor pipeline stall time is reduced even though a cache hit results in an additional coherency check because most coherency checks do not result in a cache hit.
REFERENCES:
patent: 4977498 (1990-12-01), Rastegar et al.
patent: 5025365 (1991-06-01), Marthur et al.
patent: 5091846 (1992-02-01), Sachs et al.
patent: 5136700 (1992-08-01), Thacker
patent: 5247648 (1993-09-01), Watkins et al.
patent: 5249284 (1993-09-01), Kass et al.
patent: 5276852 (1994-01-01), Lallander et al.
patent: 5297269 (1994-03-01), Donaldson et al.
patent: 5355467 (1994-10-01), MacWilliams et al.
patent: 5406504 (1995-04-01), Denisco et al.
Bryg William R.
Chan Kenneth K.
Delano Eric
Shelton John F.
An Meng-Ai T.
Hewlett--Packard Company
Nguyen Dzung C.
LandOfFree
Method and apparatus for checking cache coherency in a computer does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for checking cache coherency in a computer , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for checking cache coherency in a computer will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1184606