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

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Message-ID: <alpine.DEB.2.11.1412110902450.28416@gentwo.org>
Date:	Thu, 11 Dec 2014 09:03:24 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Jesper Dangaard Brouer <brouer@...hat.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
Subject: Re: [PATCH 0/7] slub: Fastpath optimization (especially for RT) V1

On Thu, 11 Dec 2014, Jesper Dangaard Brouer wrote:

> It looks like an impressive saving 116 -> 60 cycles.  I just don't see
> the same kind of improvements with my similar tests[1][2].

This is particularly for a CONFIG_PREEMPT kernel. There will be no effect
on !CONFIG_PREEMPT I hope.

> I do see the improvement, but it is not as high as I would have expected.

Do you have CONFIG_PREEMPT set?

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