| Date | Wed, 12 Dec 2007 15:30:44 +0100 | From | Rene Herman <> | Subject | Re: [RFT] Port 0x80 I/O speed |
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On 12-12-07 09:59, Juergen Beisert wrote:
> $ 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
This one's really wrong. This would be 10 microsecs. I suppose the machine/bus was heavily loaded or something?
> $ 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
This one's normal again...
Rene.
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