Re: FEATURE REQUEST: Specific Processor Optimizations on x86 Architecture

From: Zwane Mwaikambo
Date: Tue Nov 18 2003 - 09:30:24 EST


On Mon, 27 Oct 2003, Andi Kleen wrote:

> Zwane Mwaikambo <zwane@xxxxxxxxxxxxxxxx> writes:
>
> > On Mon, 27 Oct 2003, Andi Kleen wrote:
> >
> > > The wmb() change is not needed, unless you have an oostore CPU
> > > (x86 has ordered writes by default). It probably does not hurt
> > > neither though (I do it the same way on x86-64), but also doesn't
> > > change anything.
> >
> > The original intent was to fix an SMP P5 system, it oopses otherwise under
> > load.
>
> That doesn't make any sense. P5 doesn't support SFENCE.

I think i misparsed what you were referring to, i thought it was the patch
with the barrier in smp_call_function().

My bad.

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