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Date: Wed, 29 Mar 2017 20:05:58 +0200 From: Ingo Molnar <mingo@...nel.org> To: Randy Dunlap <rdunlap@...radead.org> Cc: Radu Rendec <rrendec@...sta.com>, linux-kernel@...r.kernel.org Subject: Re: Impact of CONFIG_PARAVIRT=y / mmap benchmark * Randy Dunlap <rdunlap@...radead.org> wrote: > On 03/28/17 10:17, Radu Rendec wrote: > > Hi, > > > > I'm trying to assess the performance impact of enabling PARAVIRT (and > > XEN) in a custom kernel configuration. I came across a very old thread > > (https://lkml.org/lkml/2009/5/13/449) on this topic and the conclusion > > back then was that the performance impact was (arguably) around 1%. > > > > Does anyone still have a copy of Ingo Molnar's mmap-perf.c program (the > > old link is broken)? Would it still be relevant to use it for measuring > > performance in case of PARAVIRT? > > > > Last but not least, has anyone looked into PARAVIRT performance more > > recently? > > > > Thank you! > > > > Best regards, > > Radu Rendec > > I have mmap-perf.c that says: > /* Copyright Ingo Molnar (c) 2006 */ > > and no license info... > Ingo? It's GPL v2, like the kernel. Thanks, Ingo
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