asterisk users - Feb 2006 - Performance differences 64-bit vs 32-bit

Hi Guys.

We've got a new server that we're looking to use for an Asterisk
install.  The CPU is a 64-bit AMD Opteron 246, 2Gb RAM.

We're having some compilation issues with some of the Asterisk
modules using Debian-amd64, and due to time constraints we are
considering going 32-bit for now just to get the box up and running.

Does anyone have any ballpark figures for the performance differences
between Asterisk on 32-bit and 64-bit platforms?  What kind of hit
could we expect?

Thanks.

Regards,
Austin.
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As far as I know there will be no difference.
32bit runs natively on AMD64 chips.

The only advantage of 64bit is the extra address space and huge integers
:)

But I could be wrong, iv not done any benchmarking myself just what i
have read on the net.

 > -----Original Message-----
 > From: asterisk-users-bounces@lists.digium.com [mailto:asterisk-users-
 > bounces@lists.digium.com] On Behalf Of Austin Denyer
 > Sent: 08 February 2006 14:11
 > To: asterisk-users@lists.digium.com
 > Subject: [Asterisk-Users] Performance differences 64-bit vs 32-bit
 > 
 > 
 > Hi Guys.
 > 
 > We've got a new server that we're looking to use for an Asterisk
 > install.  The CPU is a 64-bit AMD Opteron 246, 2Gb RAM.
 > 
 > We're having some compilation issues with some of the Asterisk
 > modules using Debian-amd64, and due to time constraints we are
 > considering going 32-bit for now just to get the box up and running.
 > 
 > Does anyone have any ballpark figures for the performance differences
 > between Asterisk on 32-bit and 64-bit platforms?  What kind of hit
 > could we expect?
 > 
 > Thanks.
 > 
 > Regards,
 > Austin.

Morgan Gilroy wrote:
> As far as I know there will be no difference.
> 32bit runs natively on AMD64 chips.
> 
> The only advantage of 64bit is the extra address space and huge integers
> :)
> 
> But I could be wrong, iv not done any benchmarking myself just what i
> have read on the net.
I have no idea if Asterisk gains a significant advantage on 64bits v 32, 
but thought I would respond to the commonly perpetuated statement that, 
"The only advantage of 64bit is the extra address space and huge
integers"

The x86 Instruction Set architecture allows for 8 general purpose 
registers.

The x86_64 ISA allows for 16, somewhat more flexible ones.

The potential here is for software that can effectively utilise the 
extra ones, will gain some benefit.

See http://www.techreport.com/reviews/2005q1/64-bits/index.x?pg=2 for 
more information.

Regards,

Richard