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Date: Sun, 7 May 2017 22:20:31 +0200
From: Richard Weinberger <richard.weinberger@...il.com>
To: Daniel Gruss <daniel.gruss@...k.tugraz.at>
Cc: Christoph Hellwig <hch@...radead.org>, kernel list <linux-kernel@...r.kernel.org>,
"kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>,
"clementine.maurice@...k.tugraz.at" <clementine.maurice@...k.tugraz.at>,
"moritz.lipp@...k.tugraz.at" <moritz.lipp@...k.tugraz.at>,
Michael Schwarz <michael.schwarz@...k.tugraz.at>,
Richard Fellner <richard.fellner@...dent.tugraz.at>,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>, Ingo Molnar <mingo@...nel.org>,
"anders.fogh@...ta-adan.de" <anders.fogh@...ta-adan.de>
Subject: Re: Re: [RFC, PATCH] x86_64: KAISER - do not map
kernel in user mode
Daniel,
On Fri, May 5, 2017 at 9:40 AM, Daniel Gruss
<daniel.gruss@...k.tugraz.at> 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
when CONFIG_KAISER
is enabled.
Is this expected?
If it helps I can redo the same test also on bare metal.
--
Thanks,
//richard
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