Appeal No. 1999-2252
Application 08/780,790
directly from the memory object to the sink. The modified
data path transfers data from the fast buffer to the sink
(specification, page 8, lines 25-27 and page 9, lines 1-2).
Independent claim 1 is reproduced as follows:
1. A method for controlling data transfer, the method
comprising the steps of:
(A) requesting by an application that an operating system
establish an association for purposes of data transfer between
a fast buffer and a memory object storing the data on a source
device;
(B) establishing by the operating system the association
between the fast buffer and the memory object;
(C) directing by the application that the data of the
memory object associated with the fast buffer be transferred
to a sink device via a first data path without copying any
portion of the data to main memory unless the application
attempts to access via a memory fetch/store, any portion of
the transferring data and
(D) copying the data to main memory prior to transfer to
the sink device along a second data path when the application
modifies the data of the memory object prior to step (C).
The Examiner relies on the following references:
Aichelmann et al. (Aichelmann) 4,823,259 Apr. 18, 1989
Dong et al. (Dong) 5,093,912 Mar. 3,
1992
Amini et al. (Amini) 5,381,538 Jan. 10, 1995
Appellants' admitted prior art which includes the Druschel et
al. (Druschel) article titled "Fbufs: A High-Bandwidth Cross-
3
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