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. RRS -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
