Messages in this thread | | | Date | Tue, 3 Dec 2002 10:42:13 -0500 (EST) | From | "Calin A. Culianu" <> | Subject | SMP Pentium4 -- PAUSE Instruction |
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I as wondering -- according to Intel's docs they recommend that on a P4 processor to use the PAUSE instruction (aka rep followed by a nop) inside any spin loop (such as one used in SMP spinlock code) in order to both improve processor performance and reduce power consumption.
Is this instruction being used in spin-wait loops? For some reason, I am having a hard time figuring out whether or not it is being used. There is a rep_nop() in processor.h.. but I can't determine if that is being called for spin lock lock/unlock code.
-Calin
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