Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80on some AMD64x2 laptops, etc.

[H. Peter Anvin]

Rene Herman wrote:
> Yes, just posted a Patch-For-Comments that switches on the availability 
> of a TSC (tsc_init sets tsc_disable also for !cpu_has_tsc) which would 
> mean that only really old stuff would be using the outb still. A TSC is 
> really all we need to have a sensible udelay().

Uhm, no.  You have no clue what the speed of the TSC is until you have 
been able to calibrate it against a fixed timesource - like the PIT.

	-hpa
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