linux-kernel - Re: [RFC][PATCH 0/6] Another go at speculative page faults

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Message-ID: <20141021172527.GH3219@twins.programming.kicks-ass.net>
Date:	Tue, 21 Oct 2014 19:25:27 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	torvalds@...ux-foundation.org, paulmck@...ux.vnet.ibm.com,
	tglx@...utronix.de, akpm@...ux-foundation.org, riel@...hat.com,
	mgorman@...e.de, oleg@...hat.com, mingo@...hat.com,
	minchan@...nel.org, kamezawa.hiroyu@...fujitsu.com,
	viro@...iv.linux.org.uk, laijs@...fujitsu.com, dave@...olabs.net,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [RFC][PATCH 0/6] Another go at speculative page faults

On Tue, Oct 21, 2014 at 06:23:40PM +0200, Ingo Molnar wrote:
> 
> * Peter Zijlstra <peterz@...radead.org> wrote:
> 
> > My Ivy Bridge EP (2*10*2) has a ~58% improvement in pagefault throughput:
> > 
> > PRE:
> >        149,441,555      page-faults                  ( +-  1.25% )
> >
> > POST:
> >        236,442,626      page-faults                  ( +-  0.08% )
> 
> > My Ivy Bridge EX (4*15*2) has a ~78% improvement in pagefault throughput:
> > 
> > PRE:
> >        105,789,078      page-faults                 ( +-  2.24% )
> >
> > POST:
> >        187,751,767      page-faults                 ( +-  2.24% )
> 
> I guess the 'PRE' and 'POST' numbers should be flipped around?

Nope, its the number of page-faults serviced in a fixed amount of time
(60 seconds), therefore higher is better.
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