Re: CPUTYPE in general - was Re: Which CPUTYPE for a dualcore Xeon on AMD64

In <4680895A.5060700@xxxxxxxxxxxxxxxx>, Garrett Cooper <youshi10@xxxxxxxxxxxxxxxx> typed:
Martin Turgeon wrote:
Mike Meyer a écrit :
In <20070625192308.GA14544@xxxxxxxxxxx>, Roman Divacky
<rdivacky@xxxxxxxxxxx> typed:
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
Thanks a lot for the precision, I will use nocona for my dual core Xeon.

Cedar Mill: Last P4 processor. Followup to Prescott.
Nocona: Xeon server processor code name -- first CPU with EMT64 (amd64)
compatibility [and hence first non-IA64 bit Xeon processor to feature
64-bit compatibility; not sure if it was the first non-IA64 64-bit
designed Intel processor].
Prescott: Single-core processor with HTT. Base CPU for [later
generation] P4 processors, and the dual core Pentium D [basically the
larger cousin of the Northwood CPUs]. Prescott was compacted into Cedar
Mill -- from a 90nm (?) process to 65nm.

From what I can tell, the Prescott went through a number of
iterations; the first of them didn't have HTT, or had it but it was
disabled. Later versions added that, EMT64, virtualization, and other
things. If my information is correct, the nocona was the first version
of the prescott core with em64t, and only used in Xeons.

And yes, I believe prescott and following were 90nm until Cedar Mill.

Intel suggests using -march=prescott (32-bit) and -march=nocona
(64-bit) with gcc on Core2Duo processors and equivalent Xeons.

Note that /usr/share/mk/sys.mk includes bsd.mk.cpu, which overrides
CPUTYPE if it's set to prescott or nocona. It turns nocona into
prescott if you're building for i386 and prescott into nocona if
you're building for amd64. So the correct answer to the question "Do I
set CPUTYPE to nocona or prescott in /etc/make.conf?" would seem to be
"It doesn't matter."

You can also find your CPU's type by going to this page:
http://www.intel.com/products/server/processors/index.htm?iid=serv_body+proc,
and searching for the appropriate model number. Your frequency and model
should be reported in your BIOS, if not the first couple lines of dmesg
in FreeBSD.

I've never seen those report core names. Possibly you're referring
specifically to the Xeon cpu model numbers?

thanks,
<mike
--
Mike Meyer <mwm@xxxxxxxxx> http://www.mired.org/consulting.html
Independent Network/Unix/Perforce consultant, email for more information.
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