Re: [RFT] Port 0x80 I/O speed

["Edwin de Caluwé" <edwindecaluwe@gmail.com>]

Exactly constant timing in every iteration:

cycles: out 667, in 305

processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 8
model name      : Celeron (Coppermine)
stepping        : 3
cpu MHz         : 497.582
cache size      : 128 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 2
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca
cmov pat pse36 mmx fxsr sse up
bogomips        : 996.21
clflush size    : 32


On 12/12/07, Paolo Ornati <ornati@fastwebnet.it> wrote:
> On Wed, 12 Dec 2007 00:31:18 +0100
> Rene Herman <rene.herman@gmail.com> wrote:
> >
> > and on a PII 400 (Intel 440BX chipset) a constant:
> >
> > rene@6bap:~/src/port80$ su -c ./port80
> > cycles: out 553, in 251
> >
> > Results are (mostly) independent of compiler optimisation, but testing
> with
> > an -O2 compile should be most useful. Thanks!
> >
>
> ### Core2 Duo 1.8 GHz ###
>
> X86_64 -m32 -O2:
>
> $ for i in `seq 5`; do sudo ./port80; sleep 1; done
> cycles: out 1498, in 964
> cycles: out 1498, in 964
> cycles: out 1499, in 964
> cycles: out 1498, in 964
> cycles: out 1498, in 965
>
> processor	: 0
> vendor_id	: GenuineIntel
> cpu family	: 6
> model		: 15
> model name	: Intel(R) Core(TM)2 CPU          6300  @ 1.86GHz
> stepping	: 6
> cpu MHz		: 1864.805
> cache size	: 2048 KB
> physical id	: 0
> siblings	: 2
> core id		: 0
> cpu cores	: 2
> 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 ht tm pbe syscall nx lm
> constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx est tm2
> ssse3 cx16 xtpr lahf_lm
> bogomips	: 3731.82
> clflush size	: 64
> cache_alignment	: 64
> address sizes	: 36 bits physical, 48 bits virtual
> power management:
>
> [...]
>
>
> --
> 	Paolo Ornati
> 	Linux 2.6.24-rc4-g94545bad on x86_64
> --
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