linux-kernel - Re: [PATCH][KVM][retry 1] Add support for Pause Filtering to AMD SVM

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Date:	Mon, 11 May 2009 17:18:23 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Avi Kivity <avi@...hat.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mark Langsdorf <mark.langsdorf@....com>,
	Joerg Roedel <joerg.roedel@....com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH][KVM][retry 1] Add support for Pause Filtering to AMD
	SVM


* Avi Kivity <avi@...hat.com> wrote:

>> I.e. the 3000 cycles value itself could be eliminated as well. 
>> (with just a common-sense max of say 100,000 cycles enforced)
>
> Yeah, though that has a much smaller effect as it's only 
> responsible for a few microseconds of spinning.

3000 cycles would be 1-2 usecs. Isnt the VM exit+entry cost still in 
that range?

	Ingo
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