Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934221AbaLKRSe (ORCPT ); Thu, 11 Dec 2014 12:18:34 -0500 Received: from resqmta-po-12v.sys.comcast.net ([96.114.154.171]:34582 "EHLO resqmta-po-12v.sys.comcast.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932521AbaLKRSd (ORCPT ); Thu, 11 Dec 2014 12:18:33 -0500 Date: Thu, 11 Dec 2014 11:18:31 -0600 (CST) From: Christoph Lameter X-X-Sender: cl@gentwo.org To: Jesper Dangaard Brouer cc: akpm@linuxfoundation.org, rostedt@goodmis.org, linux-kernel@vger.kernel.org, Thomas Gleixner , linux-mm@kvack.org, penberg@kernel.org, iamjoonsoo.kim@lge.com Subject: Re: [PATCH 0/7] slub: Fastpath optimization (especially for RT) V1 In-Reply-To: <20141211175058.64a1c2fc@redhat.com> Message-ID: References: <20141210163017.092096069@linux.com> <20141211143518.02c781ee@redhat.com> <20141211175058.64a1c2fc@redhat.com> Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/