Date: Mon, 25 Jun 2007 17:09:20 -0400 From: Mike Meyer <mwm-keyword-freebsdhackers2.e313df@mired.org> To: Roman Divacky <rdivacky@freebsd.org> Cc: freebsd-hackers@freebsd.org Subject: Re: CPUTYPE in general - was Re: Which CPUTYPE for a dualcore Xeon on AMD64 Message-ID: <18048.12032.316862.338084@bhuda.mired.org> In-Reply-To: <20070625192308.GA14544@freebsd.org> References: <467EF0C1.1010609@optiksecurite.com> <ab581e310706250250m4ec2432fide67251d7bcad132@mail.gmail.com> <467FFF41.10204@math.missouri.edu> <20070625192308.GA14544@freebsd.org>
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In <20070625192308.GA14544@freebsd.org>, Roman Divacky <rdivacky@freebsd.org> typed: > you should know what cpu you bought, or just use cpuid (found in ports) > and determine what cpu you have. Knowing what CPU you bought doesn't help a lot for the case asked about of "nocona" vs. "prescott". Those are the names of P4 and Xeon cores, not CPUs - and not the last cores used in either line. cpuid will tell you what features your CPU supports, but not the name of the core. So it only helps if you know what you're looking for. P4 and Xeon are just marketing names, and the features available vary quite a bit across the lines. Even knowing the core names doesn't help, as some prescott cored P4s have all the gcc "nocona" features. Assuming the gcc man page is correct, use cpuid to check the feature sets of your CPU. If you don't have SSE2, then you should be using something prior to pentium 4. If you have SSE2 but not SSE3, then you want pentium-m, pentium4 or pentium4m. If you have SSE3, then you should be using either nocona or prescott. If you have 64 bit support, you want nocona, otherwise prescott. For the record, I believe the nocona cores are: pentium 4/some prescott, prescott 2m, cedar mill pentium D/all core 2 duo/all All xeons with sse3 except the sossaman cored Xeon LV. The prescott cores are: pentium 4/some prescott xeon lv (sossaman core) core solo core duo <mike -- Mike Meyer <mwm@mired.org> http://www.mired.org/consulting.html Independent Network/Unix/Perforce consultant, email for more information.
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