Date: Fri, 20 Feb 2009 16:55:55 -0800 From: Garrett Cooper <yanefbsd@gmail.com> To: Howard Leadmon <howard@leadmon.net> Cc: freebsd-amd64@freebsd.org Subject: Re: Intel Xeon Processor kernel compile CPU type. Message-ID: <7d6fde3d0902201655r5a69985cubd8f21fb38b0771@mail.gmail.com> In-Reply-To: <01b401c993b5$525b7960$f7126c20$@net> References: <9D0C41D6-5EDB-4D17-8258-352FE8ADAFBD@chesterdkat.com> <499DAAF8.4030005@dir.bg> <6101e8c40902191108w2234b13k84466dfd9f1fe4ee@mail.gmail.com> <013f01c99364$5689e4a0$039dade0$@net> <20090220185928.GB7314@slackbox.xs4all.nl> <01b401c993b5$525b7960$f7126c20$@net>
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On Fri, Feb 20, 2009 at 3:45 PM, Howard Leadmon <howard@leadmon.net> wrote: > Good, so nocona is really the right one to specify. Good to know I have > been doing it correctly on my x64 machines, and heck nice document/defines > there, I'll keep that in my notes so I know how to find stuff like that in > the future.. > > > --- > Howard Leadmon > > >> -----Original Message----- >> From: Roland Smith [mailto:rsmith@xs4all.nl] >> Sent: Friday, February 20, 2009 1:59 PM >> To: Howard Leadmon >> Cc: 'Oliver Pinter'; freebsd-amd64@freebsd.org >> Subject: Re: Intel Xeon Processor kernel compile CPU type. >> >> On Fri, Feb 20, 2009 at 09:05:46AM -0500, Howard Leadmon wrote: >> > I knew HAMMER was the only type for making your kernel, but what >> CPUTYPE's >> > are OK for 64bit? >> <snip> >> > CPU: Intel(R) Xeon(TM) CPU 2.80GHz (2793.20-MHz K8-class CPU) >> > Origin = "GenuineIntel" Id = 0xf48 Stepping = 8 >> > >> > >> Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,M >> CA >> > ,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE> >> > Features2=0x649d<SSE3,RSVD2,MON,DS_CPL,EST,CNXT-ID,CX16,xTPR> >> > AMD Features=0x20100800<SYSCALL,NX,LM> >> > AMD Features2=0x1<LAHF> >> > Cores per package: 2 >> > Logical CPUs per core: 2 >> > FreeBSD/SMP: Multiprocessor System Detected: 8 CPUs >> > >> > So should this stuff be set to nocona, core2, or what?? >> >> Have a look at /usr/share/mk/bsd.cpu.mk. If you are using the amd64 >> architecture, you can use CPUTYPE=prescott or CPUTYPE=core2, but both >> will be converted to CPUTYPE=nocona. That's probably because that is the >> latest variant that the gcc in base understands. I know it's already been said, but Intel recommends (with the compiler version that we have) to use prescott for i686 and nocona for amd64 because it best matches the caching / instruction scheduling for the Core 2 CPU's. If we actually move to gcc 4.3+ they have improved support for -march=core2. HTH, -Garrett
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