linux-kernel - Re: [benchmark] 1% performance overhead of paravirt

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Message-ID: <20090610012605.GB17743@elte.hu>
Date:	Wed, 10 Jun 2009 03:26:05 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	Nick Piggin <npiggin@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Avi Kivity <avi@...hat.com>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [benchmark] 1% performance overhead of paravirt_ops on native
	kernels


* Paul Mackerras <paulus@...ba.org> wrote:

> Ingo Molnar writes:
> 
> > I did this fork overhead measurement some time ago, using 
> > perfcounters and 'perf':
> 
> Could you post the program?  I'd like to try it on some systems 
> here.

I still have it, it was something really, really simple and silly:

int main(void)
{
	int i;

	for (i = 0; i < 8; i++)
		if (!fork())
			wait(0);
}

	Ingo
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