Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops

Rene Herman
2007-12-11T16:42:16Z

On 11-12-07 17:32, John Stoffel wrote:

> Here's my results on a PIII Xeon, 550mhz, 440GX chipset, and an ISA
> slot, which until recently was actually used with an 8 port serial
> card:
>
> jfsnew:~/src> sudo ./port80
> out: 729
> in : 348
> jfsnew:~/src> sudo ./port80
> out: 729
> in : 354
> jfsnew:~/src> sudo ./port80
> out: 729
> in : 350
> jfsnew:~/src> sudo ./port80
> out: 728
> in : 346
> jfsnew:~/src> sudo ./port80
> out: 730
> in : 340

Thank you. That's a little odd. The "in" time should be close to the "out"
time really.

Well, err, <shrug> I guess.

For now noone's contemplating replacing the out with an in anyways :-)

Rene.