One of the biggest differences is that EMT64 has no IOMMU. http://lwn.net/Articles/91870/
Here is a report of a successful gentoo AMD64 install on EMT64 Xeons:
http://forums.gentoo.org/viewtopic-t-295203-highlight-emt64.html
The user concludes that the performance difference between 32 and 64bit on EMT64 is not as significant as with AMD64.
[EMAIL PROTECTED] wrote:
In some situations the Xeons running in 64-bit mode are faster and in some situations they are not. For the full details on this, read my review here:
http://www.linuxhardware.org/article.pl?sid=04/10/27/204232
Hopefully that will clear some things up. I am completing my review of the new Pentium 4s with the same 64-bit core. That may shed even more light onto the situation. Check LinuxHardware.org within the next week for that review.
Thanks, Kris Kersey (Augustus) LinuxHardware.org Site Manager [EMAIL PROTECTED] Gentoo Linux AMD64 Developer [EMAIL PROTECTED]
On Sun, 20 Feb 2005, Luke-Jr wrote:
On Sunday 20 February 2005 22:07, gentoo-user wrote:
I'm getting a server with Intel Xeon CPUs that support EM64T (Intel's
version of AMD64). Would you recommend sticking with i686 compile options
for a production-level server? What are the benefits of compiling with
64-bit support? Is the speed difference (if any) worth the potential loss
of stability?
From what I've heard, Intel's x86_64 CPUs really are just x86 with added 64-bit emulation on the chip. 64-bit code therefore runs slower, etc... Might want to confirm it from someone who actually has one, though. -- Luke-Jr Developer, Utopios http://utopios.org/
-- gentoo-amd64@gentoo.org mailing list
-- gentoo-amd64@gentoo.org mailing list
-- gentoo-amd64@gentoo.org mailing list
