问题
What is the equivalent of Linux's /proc/cpuinfo on FreeBSD v8.1? My application reads /proc/cpuinfo and saves the information in the log file, what could I do to get similar information logged on FreeBSD?
A sample /proc/cpuinfo looks like this:
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 23
model name : Intel(R) Xeon(R) CPU E5420 @ 2.50GHz
stepping : 8
cpu MHz : 2499.015
cache size : 6144 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : 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 nx lm constant_tsc pni ds_cpl
bogomips : 5004.54
processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 23
model name : Intel(R) Xeon(R) CPU E5420 @ 2.50GHz
stepping : 8
cpu MHz : 2499.015
cache size : 6144 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : 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 nx lm constant_tsc pni ds_cpl
bogomips : 5009.45
回答1:
Use dmidecode command:
# dmidecode -t processor -t cache
# dmidecode 3.0
Scanning /dev/mem for entry point.
SMBIOS 2.4 present.
Handle 0x0004, DMI type 4, 35 bytes
Processor Information
Socket Designation: LGA 775
Type: Central Processor
Family: Pentium 4
Manufacturer: Intel
ID: F6 06 00 00 FF FB EB BF
Signature: Type 0, Family 6, Model 15, Stepping 6
Flags:
FPU (Floating-point unit on-chip)
VME (Virtual mode extension)
DE (Debugging extension)
PSE (Page size extension)
TSC (Time stamp counter)
MSR (Model specific registers)
PAE (Physical address extension)
MCE (Machine check exception)
CX8 (CMPXCHG8 instruction supported)
APIC (On-chip APIC hardware supported)
SEP (Fast system call)
MTRR (Memory type range registers)
PGE (Page global enable)
MCA (Machine check architecture)
CMOV (Conditional move instruction supported)
PAT (Page attribute table)
PSE-36 (36-bit page size extension)
CLFSH (CLFLUSH instruction supported)
DS (Debug store)
ACPI (ACPI supported)
MMX (MMX technology supported)
FXSR (FXSAVE and FXSTOR instructions supported)
SSE (Streaming SIMD extensions)
SSE2 (Streaming SIMD extensions 2)
SS (Self-snoop)
HTT (Multi-threading)
TM (Thermal monitor supported)
PBE (Pending break enabled)
Version: Intel(R) Core(TM)2 CPU 6600 @ 2.40GHz
Voltage: 1.4 V
External Clock: 266 MHz
Max Speed: 3800 MHz
Current Speed: 2394 MHz
Status: Populated, Enabled
Upgrade: Other
L1 Cache Handle: 0x0005
L2 Cache Handle: 0x0006
L3 Cache Handle: 0x0007
Serial Number: To Be Filled By O.E.M.
Asset Tag: To Be Filled By O.E.M.
Part Number: To Be Filled By O.E.M.
Handle 0x0005, DMI type 7, 19 bytes
Cache Information
Socket Designation: L1-Cache
Configuration: Enabled, Not Socketed, Level 1
Operational Mode: Write Back
Location: Internal
......
回答2:
I don’t believe there is anything as detailed as Linux’s /proc/cpuinfo. Look into sysctl hw and /var/run/dmesg.boot. Most of the information like CPU speed and instruction sets should be in there somewhere.
This is what I see (with a few uninteresting hw.* fields removed):
$ uname -sr
FreeBSD 4.10-RELEASE
$ grep -i cpu /var/run/dmesg.boot
CPU: Pentium III/Pentium III Xeon/Celeron (448.97-MHz 686-class CPU)
$ /sbin/sysctl hw
hw.machine: i386
hw.model: Pentium III/Pentium III Xeon/Celeron
hw.ncpu: 1
hw.byteorder: 1234
hw.physmem: 665989120
hw.usermem: 604614656
hw.pagesize: 4096
hw.floatingpoint: 1
hw.machine_arch: i386
hw.aac.iosize_max: 65536
hw.an.an_dump: off
hw.an.an_cache_mode: dbm
hw.an.an_cache_mcastonly: 0
hw.an.an_cache_iponly: 1
hw.fxp_rnr: 0
hw.fxp_noflow: 0
hw.dc_quick: 1
hw.ste.rxsyncs: 0
hw.instruction_sse: 0
hw.availpages: 162432
(Note that on OpenBSD, the cpu speed is found in hw.cpuspeed instead of in dmesg.)
回答3:
Just to add to jleedev’s comment, you can use the sysctl(3) syscall to get this information out of the kernel from your application. See the CTL_HW top-level name:
http://www.manpages.info/freebsd/sysctl.3.html
回答4:
Note that information like the CPU features and various CPU cache sizes are not in the sysctl output, but they are available in the output from dmidecode under FreeBSD.
回答5:
If you're interested in CPU flags, you also could take a look at
dmesg -a | grep Features
or
grep Features /var/run/dmesg.boot
That would show something like
Features=0xfebfbff<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>
Features2=0x82982203<SSE3,PCLMULQDQ,SSSE3,CX16,SSE4.1,SSE4.2,POPCNT,
AESNI,<b31>>
AMD Features=0x28100000<NX,RDTSCP,LM>
AMD Features2=0x1<LAHF>
来源：https://stackoverflow.com/questions/4083848/what-is-the-equivalent-of-proc-cpuinfo-on-freebsd-v8-1