Date: Mon, 25 Jun 2007 17:29:12 -0400 From: Martin Turgeon <turgeon.martin@gmail.com> To: Mike Meyer <mwm-keyword-freebsdhackers2.e313df@mired.org> Cc: freebsd-hackers@freebsd.org, Roman Divacky <rdivacky@freebsd.org> Subject: Re: CPUTYPE in general - was Re: Which CPUTYPE for a dualcore Xeon on AMD64 Message-ID: <468033A8.8060103@gmail.com> In-Reply-To: <18048.12032.316862.338084@bhuda.mired.org> References: <467EF0C1.1010609@optiksecurite.com> <ab581e310706250250m4ec2432fide67251d7bcad132@mail.gmail.com> <467FFF41.10204@math.missouri.edu> <20070625192308.GA14544@freebsd.org> <18048.12032.316862.338084@bhuda.mired.org>
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Mike Meyer a écrit : > 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 > Thanks a lot for the precision, I will use nocona for my dual core Xeon. Martin
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