pchris@monet.Berkeley.EDU (Chris Perleberg) (10/17/88)
(Sorry if this is a repost) Does the NeXT computer have a cache external to the processor? I know the 68030 has on-chip data and instruction caches, but their small size leads to high miss rates. If NeXT does have an external cache, what is its size, organization, replacement algorithm, "average" miss rate, etc.? Thanks, Chris Perleberg pchris@ucbarpa.berkeley.edu
c152-tb@cory.Berkeley.EDU (Chris Perleberg) (10/18/88)
Does the NeXT computer have a cache external to the processor? I know the 68030 has on-chip data and instruction caches, but their small size leads to high miss rates. If NeXT does have an external cache, what is its size, organization, replacement algorithm, "average" miss rate, etc.? Thanks, Chris Perleberg pchris@ucbarpa.berkeley.edu
brown@hpccc.HP.COM (Jeffrey L. Brown) (10/21/88)
/ hpccc:alt.next / pchris@monet.Berkeley.EDU (Chris Perleberg) / 9:39 am Oct 17, 1988 / (Sorry if this is a repost) Does the NeXT computer have a cache external to the processor? I know the 68030 has on-chip data and instruction caches, but their small size leads to high miss rates. If NeXT does have an external cache, what is its size, organization, replacement algorithm, "average" miss rate, etc.? Thanks, Chris Perleberg pchris@ucbarpa.berkeley.edu ---------- I watched a talk that someone from NeXT gave at Stanford yesterday. Someone asked a question very similar to this on. The guy from NeXT gave a definitive "NO" answer: the 68030 has internally caching of both busses; other than that there is no caching in the system. On a completely different topic (yet slightly related in a upside-down-and- backwards sort of way... :-) ), a few people wanted to know how the box was doing its graphics. The guy from NeXT (I wish I remembered his name) said there is hardware support for what he called compositing. I'm not a graphics guru; from what he said it has something to do with making things transparent when objects pass over each other. Anyway, all other graphics ops are done in software--no other hardware support. I had hoped he would have a machine present to demo stuff, "but this is a technical talk..." Now that I'm done rambling idly on.... Jeff Brown HP Corp. Computing brown%hpccc@hplabs.hp.com It just doesn't matter....