Re: [PATCH] Document Linux's memory barriers [try #5]

Linus Torvalds
2006-03-16T23:55:38Z

On Thu, 16 Mar 2006, Paul E. McKenney wrote:
>
> Also, I have some verbiage and diagrams of Alpha's operation at
> http://www.rdrop.com/users/paulmck/scalability/paper/ordering.2006.03.13a.pdf
> Feel free to take any that helps. (Source for paper is Latex and xfig,
> for whatever that is worth.)

This paper too claims that x86-64 has somehow different memory ordering
constraints than regular x86. Do you actually have a source for that
statement, or is it just a continuation of what looks like confusion in
the Linux x86-64 header files?

(Also, x86 doesn't have an incoherent instruction cache - some older x86
cores have an incoherent instruction decode _buffer_, but that's a
slightly different issue with basically no effect on any sane program).

Linus