[perf-discuss] kcopy() implementation

[Alexander . Gorshenev]

Hi,

I have noticed that the amd64 version of kcopy() uses the same "rep smov" the 
i386 version use.

The AMD's "Opteron Optimization Guide" states that it is a wrong decision:

see the chapters:

5.12 Appropriate Memory Copying Routines

8.3 Repeated String Instructions

As far as I can tell kcopy() is the function kernel spends considerable time in.

thanks,
Alexander


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