[SunRescue] 4/6xx capabilities?
james at foonly.com
Tue Jan 11 15:23:09 CST 2000
On Tue, 11 Jan 2000, Martin Frost wrote:
> Does anyone know whether Solaris has any trouble with 2.5Gb memory
> in only a 32-bit virtual address space? It would depend on whether
> it reserves part of the address space for a fixed mapping of all
> physical memory (ala Linux), I suppose.
No trouble at all. The SC2000 supported 5GB RAM. No single process could
map more than 3.75GB but you could run several large processes.
Since SuperSparc supports a 36-bit physical address space, it's not
possible to map it all into virtual space all the time. The same is true
of the recent Pentium chips (P. Pro and up I believe) but few people take
advantage of it.
Generally, in pre-Ultras, the first 3.75GB is reserved for userspace. The
kernel maps the top 256MB.
> Whoa. The cost of 224 x 16Mb SIMMs has just occurred to me. ;) 
A _heck_ of a lot cheaper now than it would have been in 1991, when 16MB
SIMMs were pushing $500+/ea.
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