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

[Juergen Beisert]

$ for i in `seq 5`; do ./port80; sleep 1; done
cycles: out 5260, in 2372
cycles: out 5260, in 2384
cycles: out 5260, in 2323
cycles: out 5270, in 2382
cycles: out 5259, in 2323

$ cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 7
model name      : Pentium III (Katmai)
stepping        : 3
cpu MHz         : 501.208
cache size      : 512 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 apic sep mtrr pge mca 
cmov pat pse36 mmx fxsr sse
bogomips        : 993.28

#########

$ for i in `seq 5`; do ./port80; sleep 1; done
cycles: out 1214, in 1095
cycles: out 1215, in 1094
cycles: out 1214, in 1095
cycles: out 1216, in 1095
cycles: out 1213, in 1093

$ cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 11
model name      : Intel(R) Celeron(TM) CPU                1000MHz
stepping        : 1
cpu MHz         : 1002.285
cache size      : 256 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
bogomips        : 1998.84
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