Re: [PATCH] [2.6] [2/2] hlist: remove IFs from hlist functions

[Andi Kleen]

On Sat, 14 Feb 2004 19:59:49 +0100
Andi Kleen <ak@xxxxxxx> wrote:
> 
> A full cache miss is extremly costly on a modern Gigahertz+ CPU because
> memory and busses are far slower than the CPU core. As a rule of 
> thumb 1000+ cycles. An CMP is extremly cheap (a few cycles at worst), 
> the only thing that could be more expensive is an mispredicted conditional
> jump triggered  by the CMP. But even that would be at best a few tens of cycles.
> If everything is mispredicted which should be common it's extremly fast
                   ^^^^^^^^^^^^^
                   predicted of course

-Andi
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