linux-kernel - Re: [RFC PATCH 0/3] generic hypercall support

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Message-ID: <4A03E579.8030201@redhat.com>
Date:	Fri, 08 May 2009 10:55:37 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Marcelo Tosatti <mtosatti@...hat.com>
CC:	Gregory Haskins <ghaskins@...ell.com>,
	Chris Wright <chrisw@...s-sol.org>,
	Gregory Haskins <gregory.haskins@...il.com>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Anthony Liguori <anthony@...emonkey.ws>
Subject: Re: [RFC PATCH 0/3] generic hypercall support

Marcelo Tosatti wrote:
> Also it would be interesting to see the MMIO comparison with EPT/NPT,
> it probably sucks much less than what you're seeing.
>   

Why would NPT improve mmio?  If anything, it would be worse, since the 
processor has to do the nested walk.

Of course, these are newer machines, so the absolute results as well as 
the difference will be smaller.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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