Re: Intel P6 vs P7 system call performance

H. Peter Anvin
2002-12-19T22:09:37Z

Pavel Machek wrote:
>>
>>Different thing - int 0x80 syscall not i/o port 80. I've done I/O port
>>80 (its very easy), but requires we set up some udelay constants with an
>>initial safety value right at boot (which we should do - we udelay
>>before it is initialised)
>
> Actually that would be nice -- I have leds on 0x80 too ;-).
> Pavel

We have tried before, and failed. Phoenix uses something like 0xe2, but
apparently some machines with non-Phoenix BIOSes actually use that port.

-hpa