linux-kernel - Re: [PATCH 0/7] slub: Fastpath optimization (especially for RT) V1

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Date:	Thu, 11 Dec 2014 19:11:40 +0100
From:	Jesper Dangaard Brouer <brouer@...hat.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	akpm@...uxfoundation.org, rostedt@...dmis.org,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	linux-mm@...ck.org, penberg@...nel.org, iamjoonsoo.kim@....com,
	brouer@...hat.com
Subject: Re: [PATCH 0/7] slub: Fastpath optimization (especially for RT) V1

On Thu, 11 Dec 2014 11:18:31 -0600 (CST)
Christoph Lameter <cl@...ux.com> wrote:

> On Thu, 11 Dec 2014, Jesper Dangaard Brouer wrote:
> 
> > I was expecting to see at least (specifically) 4.291 ns improvement, as
> > this is the measured[1] cost of preempt_{disable,enable] on my system.
> 
> Right. Those calls are taken out of the fastpaths by this patchset for
> the CONFIG_PREEMPT case. So the numbers that you got do not make much
> sense to me.

True, that is also that I'm saying.  I'll try to figure out that is
going on, tomorrow.

You are welcome to run my test harness:
 http://netoptimizer.blogspot.dk/2014/11/announce-github-repo-prototype-kernel.html
 https://github.com/netoptimizer/prototype-kernel/blob/master/getting_started.rst

Just load module: time_bench_kmem_cache1
 https://github.com/netoptimizer/prototype-kernel/blob/master/kernel/lib/time_bench_kmem_cache1.c

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Sr. Network Kernel Developer at Red Hat
  Author of http://www.iptv-analyzer.org
  LinkedIn: http://www.linkedin.com/in/brouer
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