On Monday 01 January 2007 06:51, Thomas Hertweck wrote:
Randall R Schulz wrote:
On Friday 29 December 2006 18:53, John Andersen wrote:
[...] It will work with either i386 or X86_64, but in my tests its faster using x86_64. (aka EMT64).
What are those tests? My on-line research indicates that there are but a very few circumstances in which the Core 2 Duo chips are faster when used in their 64-bit mode.
I have no experience with Intel Core 2 Duo chips yet, but with Intel Xeon server CPUs which allow to use 32-bit or 64-bit OS and/or software. Our experience is that we get (same hardware specs; same software) up to xx% better performance using x86_64, i.e. we've made similar experiences to John.
I don't think Xeon's characteristics are entirely identical to those of the Core 2 architecture so it's not reasonable to expect identical performance characteristics. When I was looking into this I didn't pay too much attention to any Xeon numbers I found along the way, but I do seem to recall that some testers found that the Xeon's advantage in 64-bit mode was greater than that seen with Core 2 processors. What sort of an application mix do you run?
Cheers, Th.
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