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

John Stoffel
2007-12-11T16:33:56Z

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