What are the issues with it? DIAG 210/250 only support 24/31-bit addrs?
Maybe I'm being a bit naive, but wouldn't it be a simple matter to allow the
use, but only if there's less than 2GB of storage? And maybe use SAM31/64
to switch in and out of 64-bit mode? Oh yea, there might be a slight
Hi,
Firstly sorry for my LISTSERV message, it was sent in error - i was quite
tired when sending it out, I do apologize.
About the 31bit v 64bit:
Remember what 64bit computing is - its processing 64bits in one cycle as
opposed to (in this case, seeing as its mainframe architecture) 31bits.
On Sun, 13 Jul 2003, Post, Mark K wrote:
I would have to think that unless a particular guest needs 64-bit, that it
would be better overall to run with 31-bits. I would have to think that
there would be at least a slight performance hit to run a 64-bit system,
even if it was small.
Is that
Question I have is what are the VM development plans for full 64 bit
support? If that is going to be fixed soon then the diag suport would be
even easier to implement.
Jan Jaeger.
From: Lucius, Leland [EMAIL PROTECTED]
Reply-To: Linux on 390 Port [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Subject:
http://www.alphaworks.ibm.com/tech/ximple
--
Cheers
John.
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This was discussed on one of the other lists that I follow (the THE list
probably - I've archived the discussion now) quite a while back and was
condemned for any number of reasons but most notably for there not
being a command line and that this was being touted as an
advantage - see the FAQ.
Rod
On Sunday 13 July 2003 11:33, John Summerfield wrote:
Is that all there is? Are there beneficial new instructions available in
64-bit mode? Are there improved optimisations?
Reportedly the Opteron (64-bit) is much quicker than the Xeons (32-bit).
I know it ain't necessarily so that this has
Leland Lucius wrote:
So, why not run 31-bit Linux guests? Does it matter one way or the other?
Are there performance differences?
Not a stupid question, but a quite interesting one ...
There are many factors involved in the decision between 31-bit
and 64-bit, and some favor the one and others
On Sun, 13 Jul 2003, Ulrich Weigand wrote:
Leland Lucius wrote:
So, why not run 31-bit Linux guests? Does it matter one way or the other?
Are there performance differences?
Not a stupid question, but a quite interesting one ...
There are many factors involved in the decision between
There is much good advice in Ulrich Weigand's post, but I have three
comments:
First, long long C arithmetic data types occupy eight bytes of storage in
both an AMODE(31) and an AMODE(64) environment. The difference is that
(slow) multiple-precision subroutines are used to support them in an
Question I have is what are the VM development plans for full 64 bit
support? If that is going to be fixed soon then the diag
suport would be
even easier to implement.
Jan Jaeger.
That would be nice, but I needed a break from the normal drudgery and
thought I'd hack about a bit. The
Wow! Got some REALLY great stuff there. Even though it boils down to the
old It depends, I may just give it a try for the fun of it. (If I can
convince my SLES8 CDs to cough up 31-bit binaries. ;-))
Thanks all for the great info!
Leland
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