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From: dekker_j@kosmos.wcc.govt.nz
Newsgroups: comp.sys.mac.programmer
Subject: Data caches
Message-ID: <1991Jun19.194615.4198@kosmos.wcc.govt.nz>
Date: 19 Jun 91 07:46:14 GMT
Organization: Wellington City Council, Wellington, NZ
Lines: 17


Consider this CPU sequence when data is required in a Mac IIci: 1 Look
for data in CPU's own cache, if not there; 2 Look in installed 128k
static ram cache, if not there; 3 Look in systems ram cache, if not
there; 4 Look on the hard disk.

Correct me if this sequence is wrong!

What would be the best size for the systems ram cache? Given that the
last 128k of data may reside in the static ram, is there any point in
having it set for more than the minimum 16k. Experience suggest yes
but why.

What advantage is there in having a static ram cache of more than 32k?
Will the CPU be slowed by having to look through a larger cache or is
the increased likelihood of finding data in a 128k static cache worth
the extra time required to look?