Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262794AbUC2Knu (ORCPT ); Mon, 29 Mar 2004 05:43:50 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262807AbUC2Knu (ORCPT ); Mon, 29 Mar 2004 05:43:50 -0500 Received: from ns.suse.de ([195.135.220.2]:4035 "EHLO Cantor.suse.de") by vger.kernel.org with ESMTP id S262794AbUC2Kns (ORCPT ); Mon, 29 Mar 2004 05:43:48 -0500 Date: Mon, 29 Mar 2004 12:43:11 +0200 Message-ID: From: Takashi Iwai To: dipankar@in.ibm.com Cc: "Paul E. McKenney" , Arjan van de Ven , Robert Love , Andrew Morton , linux-kernel@vger.kernel.org Subject: Re: [PATCH] RCU for low latency (experimental) In-Reply-To: References: <20040323124002.GH3676@in.ibm.com> <20040323125044.GL22639@dualathlon.random> <20040324172657.GA1303@us.ibm.com> <20040324175142.GW2065@dualathlon.random> <20040324213914.GD4539@in.ibm.com> <20040324225326.GH2065@dualathlon.random> <20040324231145.GB12035@in.ibm.com> <20040324233430.GJ2065@dualathlon.random> <20040324234643.GD12035@in.ibm.com> <20040328172036.GH5648@in.ibm.com> User-Agent: Wanderlust/2.10.1 (Watching The Wheels) SEMI/1.14.5 (Awara-Onsen) FLIM/1.14.5 (Demachiyanagi) APEL/10.6 MULE XEmacs/21.4 (patch 13) (Rational FORTRAN) (i386-suse-linux) MIME-Version: 1.0 (generated by SEMI 1.14.5 - "Awara-Onsen") Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 848 Lines: 25 At Sun, 28 Mar 2004 19:28:41 +0200, I wrote: > > > > anyway, i confirmed that with the original krcud patch the latency > > > with dcache flood can be eliminated. > > > > Does the throttle-rcu patch also help eliminate dcache flood ? You > > can try by just changing count >= rcumaxbatch to ++count > rcumaxbatch. > > i'll try it later. the throttle-rcu patch does work indeed well even without preemption. i've tested maxbatch=16 and plugticks=0. in the older version, there was 20ms long latency, while in the patched version, no measurable latency more than 1ms. thanks for your work! Takashi - 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/