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

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Message-ID: <1490721452.1907.25.camel@arista.com>
Date:   Tue, 28 Mar 2017 18:17:32 +0100
From:   Radu Rendec <rrendec@...sta.com>
To:     linux-kernel@...r.kernel.org
Subject: Impact of CONFIG_PARAVIRT=y / mmap benchmark

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