Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262440AbVE0MLZ (ORCPT ); Fri, 27 May 2005 08:11:25 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262441AbVE0MLY (ORCPT ); Fri, 27 May 2005 08:11:24 -0400 Received: from mx2.elte.hu ([157.181.151.9]:53153 "EHLO mx2.elte.hu") by vger.kernel.org with ESMTP id S262440AbVE0MLW (ORCPT ); Fri, 27 May 2005 08:11:22 -0400 Date: Fri, 27 May 2005 14:10:56 +0200 From: Ingo Molnar To: Bill Huey Cc: Nick Piggin , Andi Kleen , Sven-Thorsten Dietrich , dwalker@mvista.com, hch@infradead.org, akpm@osdl.org, linux-kernel@vger.kernel.org Subject: Re: RT patch acceptance Message-ID: <20050527121056.GA2238@elte.hu> References: <4293DCB1.8030904@mvista.com> <20050524192029.2ef75b89.akpm@osdl.org> <20050525063306.GC5164@elte.hu> <1117044019.5840.32.camel@sdietrich-xp.vilm.net> <20050526193230.GY86087@muc.de> <1117138270.1583.44.camel@sdietrich-xp.vilm.net> <20050526202747.GB86087@muc.de> <4296ADE9.50805@yahoo.com.au> <20050527120812.GA375@nietzsche.lynx.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20050527120812.GA375@nietzsche.lynx.com> User-Agent: Mutt/1.4.2.1i X-ELTE-SpamVersion: MailScanner 4.31.6-itk1 (ELTE 1.2) SpamAssassin 2.63 ClamAV 0.73 X-ELTE-VirusStatus: clean X-ELTE-SpamCheck: no X-ELTE-SpamCheck-Details: score=-4.9, required 5.9, autolearn=not spam, BAYES_00 -4.90 X-ELTE-SpamLevel: X-ELTE-SpamScore: -4 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 777 Lines: 18 * Bill Huey wrote: > There's really no good reason why this kernel can't get the same > latency as a nanokernel. The scheduler paths are riddled with SMP > rebalancing stuff and the like which contributes to overall system > latency. Remove those things and replace it with things like direct > CPU pining and you'll start seeing those numbers collapse. [...] could you be a bit more specific? None of that stuff should show up on UP kernels. Even on SMP, rebalancing is either asynchronous, or O(1). Ingo - 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/