[SunRescue] memory addressing in solaris

[James Lockwood]

On Sun, 28 May 2000, Paul Khoury - Tech Support wrote:

> >In 64-bit mode on an UltraSparc, as much memory as the machine physically
> >has (no Sun currently planned has anywhere near 2^64 bytes).
> >
> Which is how many TB? =)

16384.  I think the real "limit" right now is 8192TB, though.

> >In 32-bit mode it varies from 3GB to 4GB, depending on the kernel arch and
> >the OS version.  I could quote from memory but I'd probably be wrong, and
> >the differences are minor.
> >
> Ahh.  Just was wondering to compare with a coworkers' comment about how
> much NT can address.

Guesstimates from memory (may well be wrong!):

32-bit app running under 64-bit kernel: 4GB
32-bit app running under 32-bit sun4u: 3.95GB
32-bit app running under 32-bit sun4m: 3.75GB
Solaris 2.5 or older: 3GB

-James