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Date: Sun, 7 May 2017 22:20:31 +0200
From: Richard Weinberger <>
To: Daniel Gruss <>
Cc: Christoph Hellwig <>, kernel list <>, 
	"" <>, 
	"" <>, 
	"" <>, 
	Michael Schwarz <>, 
	Richard Fellner <>, 
	"Kirill A. Shutemov" <>, Ingo Molnar <>, 
	"" <>
Subject: Re: Re: [RFC, PATCH] x86_64: KAISER - do not map
 kernel in user mode


On Fri, May 5, 2017 at 9:40 AM, Daniel Gruss
<> wrote:
> I'm sure the overhead on older systems is larger than on recent systems.

Just did a quick test on my main KVM host, a 8 core Intel(R) Xeon(R)
CPU E3-1240 V2.
KVM guests are 4.10 w/o CONFIG_KAISER and kvmconfig without CONFIG_PARAVIRT.
Building a defconfig kernel within that guests is about 10% slower
is enabled.

Is this expected?
If it helps I can redo the same test also on bare metal.


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