[prev in list] [next in list] [prev in thread] [next in thread] 

List:       aix-l
Subject:    Compare AIX/Power5 (or 6) to zSeries hardware
From:       Don Russell <russell.don () gmail ! com>
Date:       2008-04-09 16:51:01
Message-ID: d9d0c4680804090951t2edb4452he08cb587ccce3355 () mail ! gmail ! com
[Download RAW message or body]

I'm rather new to AIX and Power 5/6, but have a strong background from the
S/370 and up architecture.

Long before zSeries hardware, real memory was mapped by the Dynamic Address
Translation facility (and supporting software in the OS)  so that real
memory beyond 16Meg could have a virtual address that was "below the line".
Thus applications could still run in 24-bit mode even though they actually
resided in real memory above 16Meg.

Does that concept apply to the Power5 or 6 architecture? If more than 4Gig
of real memory (32 bit address) is installed, but apps are 32-bit, will
running the OS in 64-bit mode allow applications to use that real memory,
and have it mapped through something like DAT so it appears to be below 4Gig
for that application?

If that's not the case for AIX 5.3 on Power 5, is it true for AIX 6.1 and/or
Power 6?

Thank you.
-- 
There are 10 types of people in the world: those who understand binary, and
those who don't. :-)

[Attachment #3 (text/html)]

I&#39;m rather new to AIX and Power 5/6, but have a strong background from the S/370 \
and up architecture.<br><br>Long before zSeries hardware, real memory was mapped by \
the Dynamic Address Translation facility (and supporting software in the OS)&nbsp; so \
that real memory beyond 16Meg could have a virtual address that was &quot;below the \
line&quot;. Thus applications could still run in 24-bit mode even though they \
actually resided in real memory above 16Meg.<br> <br>Does that concept apply to the \
Power5 or 6 architecture? If more than 4Gig of real memory (32 bit address) is \
installed, but apps are 32-bit, will running the OS in 64-bit mode allow applications \
to use that real memory, and have it mapped through something like DAT so it appears \
to be below 4Gig for that application?<br> <br>If that&#39;s not the case for AIX 5.3 \
on Power 5, is it true for AIX 6.1 and/or Power 6?<br><br>Thank you.<br>-- <br>There \
are 10 types of people in the world: those who understand binary, and those who \
don&#39;t. :-)



[prev in list] [next in list] [prev in thread] [next in thread]