[Re: RAM question]

[Edward Glowacki]

Quoted from Matt Graham on Fri, Nov 16, 2001 at 10:25:38AM -0500:
> > I don't think this is correct, it doesn't make much sense.  Cache
> > and main memory are independent, and caching algorithms generally
> > work fine for any combination of the two.  You'll get better
> > performance with bigger cache, but you won't get worse performance
> > with bigger memory.
> 
> Um, nope.  The boards that Jo was talking about are certain older Pentium and
> K6-? boards, which only had enough "cache tag RAM" on the motherboard to keep
> track of a certain number of pages (64M, 256M, 512M).  If a page fell outside
> this boundary, it would be fetched from main memory, even if the processor or
> board had the page in the L1/L2 cache.  There are too many accounts and
> examples of people stuffing > 64M into an old Pentium board and finding out
> that things got very slow for this to be an urban legend.

That sounds a bit more reasonable...  =)  


-- 
Edward Glowacki				glowack2@msu.edu
GLLUG Peon  				http://www.gllug.org
Imagination is the one weapon in the war against reality.
                -- Jules de Gaultier