Date: Fri, 18 Mar 2011 04:02:48 -0700 From: Tait <freebsd@t41t.com> To: freebsd-questions@freebsd.org Subject: Re: [solved] How to tell whether CPU supports x64? Message-ID: <20110318110248.GG10069@ece.pdx.edu> In-Reply-To: <20110317213336.GF10069@ece.pdx.edu> References: <20110317213336.GF10069@ece.pdx.edu>
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The original system... I said (on 2011/03/17): > CPU: Intel(R) Xeon(TM) CPU 2.40GHz (2387.76-MHz 686-class CPU) > Origin = "GenuineIntel" Id = 0xf29 Stepping = 9 > Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE> > Features2=0x4400<CNTX-ID,<b14>> > Logical CPUs per core: 2 > FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs > cpu0 (BSP): APIC ID: 0 > cpu1 (AP): APIC ID: 1 Adam Vande More <amvandemore_gmail.com> replied (on 2011/03/17): > On Thu, Mar 17, 2011 at 5:14 PM, Ilya Kazakevich <kazakevichilya_gmail.com>wrote: > > Afaik there should be "LM" in "AMD features" output. Even for Intel. Grep > > your dmesg.boot for LM. > > yes that is correct, LM stands for Long Mode which indicates amd64 support. > If your CPU doesn't list it, it's either a 32 bit only CPU, or it's a bug. Thanks everyone for the assistance. There is no LM feature in dmesg.boot for the system in question, although a different system reports: CPU: Intel(R) Xeon(R) CPU E5520 @ 2.27GHz (2261.03-MHz 686-class CPU) Origin = "GenuineIntel" Id = 0x106a5 Stepping = 5 Features=0x1781fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,MMX,FXSR,SSE,SSE2,HTT> Features2=0x80182201<SSE3,SSSE3,CX16,SSE4.1,SSE4.2,<b31>> AMD Features=0x20100000<NX,LM> AMD Features2=0x1<LAHF> Cores per package: 16 Logical CPUs per core: 2 The Intel site does say the E5520 supports x64. It seems the lack of LM in the original system does in fact mean it's a 32-bit only processor. John Levine <johnl_iecc.com> replied (on 2011/03/17): > Looking at the Intel web site, the only Xeon I see that runs at 2.4GHz > and has two cores with two threads is the Xeon 3060, which does indeed > provide the 64 bit instruction set. I looked at the ark.intel.com site hoping to find what processor would report Id = 0xf29 Stepping = 9. I had no luck. I think the dual processors is because of HyperThreading, as indicated by the HTT feature, and that it's actually only a single core. Devin Teske <dteske_vicor.com> replied (on 2011/03/17): > I wrote this for the job (please, suggestions/comments very welcome): > #include <stdio.h> /* printf(3) */ > #include <stdlib.h> /* EXIT_SUCCESS exit(3) */ > ... I tried the program, and it reports "x86_64 support: NO" on both the original system, and the one above that appears to be x64-capable (although it is running the i386 install, which may be why?). Again, thanks all for the help.
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