linux-kernel - Re: [PATCH 01/22] x86: add methods for writing of an MSR on several CPUs

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Message-ID: <4A159179.6070607@zytor.com>
Date:	Thu, 21 May 2009 10:38:01 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Borislav Petkov <borislav.petkov@....com>
CC:	akpm@...ux-foundation.org, greg@...ah.com, mingo@...e.hu,
	norsk5@...oo.com, tglx@...utronix.de, mchehab@...hat.com,
	aris@...hat.com, edt@....ca, linux-kernel@...r.kernel.org,
	Andreas Herrmann <andreas.herrmann3@....com>
Subject: Re: [PATCH 01/22] x86: add methods for writing of an MSR on several
 CPUs

Borislav Petkov wrote:
> 
> Well, let's do the nonserializing thing and have it done right from the
> beginning. We might not care now but who knows..?
> 

If nothing else it might matter for boot time.  Serializing *anything*
across a large number of CPUs can be very expensive.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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