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

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Message-ID: <48F91673.6090901@zytor.com>
Date:	Fri, 17 Oct 2008 15:49:23 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
CC:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: Add clflush before monitor for Intel 7400 series

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.

	-hpa
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