Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261854AbVEaLOs (ORCPT ); Tue, 31 May 2005 07:14:48 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261859AbVEaLOs (ORCPT ); Tue, 31 May 2005 07:14:48 -0400 Received: from colin.muc.de ([193.149.48.1]:13317 "EHLO mail.muc.de") by vger.kernel.org with ESMTP id S261854AbVEaLOr (ORCPT ); Tue, 31 May 2005 07:14:47 -0400 Date: 31 May 2005 13:14:45 +0200 Date: Tue, 31 May 2005 13:14:45 +0200 From: Andi Kleen To: James Bruce Cc: Nick Piggin , Sven-Thorsten Dietrich , Ingo Molnar , dwalker@mvista.com, hch@infradead.org, akpm@osdl.org, linux-kernel@vger.kernel.org Subject: Re: RT patch acceptance Message-ID: <20050531111445.GA35122@muc.de> References: <4299A98D.1080805@andrew.cmu.edu> <429ADEDD.4020805@yahoo.com.au> <429B1898.8040805@andrew.cmu.edu> <429B2160.7010005@yahoo.com.au> <20050530222747.GB9972@nietzsche.lynx.com> <429BBC2D.70406@yahoo.com.au> <20050531020957.GA10814@nietzsche.lynx.com> <429C2A64.1040204@andrew.cmu.edu> <429C2F72.7060300@yahoo.com.au> <429C4112.2010808@andrew.cmu.edu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <429C4112.2010808@andrew.cmu.edu> User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1013 Lines: 20 On Tue, May 31, 2005 at 06:48:50AM -0400, James Bruce wrote: > P.S. Preempt-RT is a sight to behold while updatedb is running. The > difference between it and ordinary preempt is quite impressive. Nothing > currently running has so much as a hiccup, even though / is using the > non-latency-friendly ReiserFS. The only way I even notice updatedb is > running at all is through my CPU monitor and the fact that disk IO is > slower. Are you sure it is not only disk IO? In theory updatedb shouldn't need much CPU, but it eats a lot of memory and causes stalls in the disk (or at least that was my interpration on the stalls I saw) If there is really a scheduling latency problem with updatedb then that definitely needs to be fixed in the stock kernel. -Andi - 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/