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Old 22nd April 2009, 02:53 PM
timcoote Offline
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Join Date: May 2006
Posts: 32
is the meaning of bogomips different between 32 bit and 64 bit

I bought two identical dell servers. I installed 32 bit f8 on one and 64 bit f9 on the other. I've just noticed that the bogomips for the f9 box are about half the reported values for the f8 box. Is this correct/ meaningful? I'd assume that the intention of bogomips is to provide a reasonable architecture independent benchmark, so the difference surprises me:
here's the samples from processor 0 on each:
64 bit box:-
Code:
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 15
model           : 67
model name      : Dual-Core AMD Opteron(tm) Processor 1214
stepping        : 3
cpu MHz         : 1000.000
cache size      : 1024 KB
physical id     : 0
siblings        : 2
core id         : 0
cpu cores       : 2
apicid          : 0
initial apicid  : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clfl
ush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt rdtscp lm 3dnowext 3dnow rep_good nopl pni
 cx16 lahf_lm cmp_legacy svm extapic cr8_legacybogomips        : 2009.23TLB size        : 1024 4K pages
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management: ts fid vid ttp tm stc
--32 bit box--:
Code:
processor       : 0
vendor_id       : AuthenticAMD
cpu family      : 15
model           : 67
model name      : Dual-Core AMD Opteron(tm) Processor 1214
stepping        : 3
cpu MHz         : 2200.000
cache size      : 1024 KB
physical id     : 0
siblings        : 2
core id         : 0
cpu cores       : 2
apicid          : 0
initial apicid  : 0
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 1
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 
ht syscall nx mmxext fxsr_opt rdtscp lm 3dnowext 3dnow pni cx16 lahf_lm cmp_legacy svm extapic cr8_legacy
bogomips        : 4422.59
clflush size    : 64
power management: ts fid vid ttp tm stc
I do note that the 64bit machine is reporting a cpu frequency of 1GHz, rather than the 2.2GHz on the 32 bit box, so this could just be a bug in the 64bit implementation that's not upping the cpu frequency properly, but I'm sure that such a bug would have been caught.
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