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%? > > But yes we should probably just remove this special case to make > > maintenance easier. > > It's CONFIG_SMP anyway, which none of the winchips were. It's not. And we need memory barriers even without SMP when talking to device drivers. Only the smp_*b()s get noped on UP. -Andi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
