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SubjectRe: [rfc][patch 2/3] x86: fix IO write barriers
On Thu, Oct 04, 2007 at 08:58:27PM +0200, Andi Kleen wrote:
> On Thursday 04 October 2007 20:41:07 Dave Jones wrote:
> > On Thu, Oct 04, 2007 at 08:21:59PM +0200, Andi Kleen wrote:
> > > On Thursday 04 October 2007 20:10:44 Dave Jones wrote:
> > > > On Thu, Oct 04, 2007 at 07:53:16PM +0200, Andi Kleen wrote:
> > > > >
> > > > > > The only vendor that ever implemented OOSTOREs was Centaur, and they
> > > > > > only did in the Winchip generation of the CPUs. When they dropped it
> > > > > > from the C3, I asked whether they intended to bring it back, and the
> > > > > > answer was "extremely unlikely".
> > > > > >
> > > > >
> > > > > Do you know if it made a big performance difference?
> > > >
> > > > On the winchip, it was a huge win. I can't remember exact numbers,
> > > > but pretty much every benchmark I threw at it at the time showed
> > > > significant improvement.
> > >
> > > Significant as in >10%?
> >
> > "Worth about 10-20% performance" according to the 2.4.18pre9-ac4
> > release notes: http://www.linuxtoday.com/news_story.php3?ltsn=2002-02-14-015-20-NW-KN
>
> Are there numbers for a newer kernel available too?

no idea, my winchips died about 5 years ago.

Dave

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