Re: [PATCH] x86: Add clflush before monitor for Intel 7400 series

From: H. Peter Anvin
Date: Fri Oct 17 2008 - 18:49:53 EST

Pallipadi, Venkatesh wrote:

I guess I'm a bit confused about the tradeoff of CLFLUSH versus simply
disabling MWAIT. This is a relatively recent processor and so
optimizing matters (if this was a P4 I would be more worried about what
has least impact on the kernel as a whole.)

As of now this is only for a limited models of CPUs (MP CPUs)
and not a norm. It is a errata on this CPU and not
something that is going to become architectural.

Yes, I understand. However, there is still the option to disable MWAIT, and the question is still open if it makes sense.

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