linux-kernel - Re: Impact of CONFIG_PARAVIRT=y / mmap benchmark

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Message-ID: <2639617f-fe7c-e6cb-c7bf-094a73490228@infradead.org>
Date:   Wed, 29 Mar 2017 08:54:29 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Radu Rendec <rrendec@...sta.com>, linux-kernel@...r.kernel.org
Cc:     Ingo Molnar <mingo@...nel.org>
Subject: Re: Impact of CONFIG_PARAVIRT=y / mmap benchmark

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?


-- 
~Randy