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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