> $ cat /proc/interrupts
> CPU0
> 0: 1116302985 XT-PIC timer
> 1: 2 XT-PIC keyboard
> 2: 0 XT-PIC cascade
> 8: 1 XT-PIC rtc
> 9: 28980016 XT-PIC usb-uhci, eth0
> 14: 698146587 XT-PIC ide0
> 15: 5 XT-PIC ide1
> NMI: 0
> ERR: 0
>
> Shock horror - I can continually poll this and spot
> when an IRQ occurs.
To what level of accuracy do you think you can measure when interrupts
occur? From my tests, you can (if you max the processor and do no math on
the results) read /proc/interrupts about once every 30,000 instruction
cycles. This would still leave about 14 bits of entropy in each interrupt.
Overall, you're just making the system busier.
DS
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This archive was generated by hypermail 2b29 : Thu Aug 23 2001 - 21:00:32 EST