A method of determining whether to issue a pre-fetch transaction in a memory
control
system comprising generating a pre-fetch threshold dependent on a demand load of
a memory controller, calculating a probability measure of pre-fetch accuracy, comparing
the threshold with the calculated probability measure, and determining whether
to issue a pre-fetch transaction based upon the comparison of the threshold with
the calculated probability measure is provided. A pre-fetch apparatus implemented
in a memory control system comprising a pre-fetch threshold generator operable
to output a pre-fetch threshold in response to a signal indicative of a memory
controller demand load, and a comparator circuit operable to compare the pre-fetch
threshold and a probability measure of pre-fetch accuracy, wherein the pre-fetch
apparatus issues a pre-fetch transaction on the basis of the comparison by the
comparator is provided.
