>> So we know it [single level storage] works, but also that people don't
seem to care much for it
>
>People didn't care, because the AS/400 was based on a proprietary
solution.
I don't know what a "proprietary solution" is, but what we had was a
complete demonstration of the value of single level storage, in commercial
use and everything, and other computer makers (and other business units
of IBM) stuck with their memory/disk split personality. For 25 years,
lots of computer makers developed lots of new computer architectures and
they all (practically speaking) had the memory/disk split. There has to
be a lesson in that.
>With todays generically mass-produced 64bit archs, what's not to care
about a
>cost-effective system that provides direct mapped access into linear
address
>space?
I don't know; I'm sure it's complicated. But unless the stumbling block
since 1980 has been that it was too hard to get/make a CPU with a 64 bit
address space, I don't see what's different today.
--
Bryan Henderson IBM Almaden Research Center
San Jose CA Filesystems
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