Re: [CFT][RFC] HT scheduler

[Arjan van de Ven]

On Sun, Dec 14, 2003 at 05:26:23PM +0100, Andi Kleen wrote:
> Arjan van de Ven <arjanv@xxxxxxxxxx> writes:
> > 
> > also keep in mind that current x86 processors all will internally
> > optimize out the lock prefix in UP mode or when the cacheline is owned
> > exclusive.... If HT matters here let the cpu optimize it out.....
> 
> Are you sure they optimize it out in UP mode? IMHO this would break
> device drivers that use locked cycles to communicate with bus master
> devices (and which are not necessarily mapped uncachable/write combining) 

uncachable regions are different obviously....
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