Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261539AbVE3NZm (ORCPT ); Mon, 30 May 2005 09:25:42 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261557AbVE3NZm (ORCPT ); Mon, 30 May 2005 09:25:42 -0400 Received: from smtp.lnxw.com ([207.21.185.24]:53512 "EHLO smtp.lnxw.com") by vger.kernel.org with ESMTP id S261539AbVE3NZZ (ORCPT ); Mon, 30 May 2005 09:25:25 -0400 Date: Mon, 30 May 2005 06:30:07 -0700 To: Andi Kleen Cc: Ingo Molnar , Takashi Iwai , Sven-Thorsten Dietrich , dwalker@mvista.com, bhuey@lnxw.com, nickpiggin@yahoo.com.au, hch@infradead.org, akpm@osdl.org, linux-kernel@vger.kernel.org Subject: Re: what is the -RT tree Message-ID: <20050530133007.GA8641@nietzsche.lynx.com> References: <20050527124837.GA7253@elte.hu> <20050527125630.GE86087@muc.de> <20050527131317.GA11071@elte.hu> <20050527133122.GF86087@muc.de> <20050530095349.GK86087@muc.de> <20050530103347.GA13425@elte.hu> <20050530105618.GL86087@muc.de> <20050530121031.GA26255@elte.hu> <20050530124038.GM86087@muc.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20050530124038.GM86087@muc.de> User-Agent: Mutt/1.5.9i From: Bill Huey (hui) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1055 Lines: 25 On Mon, May 30, 2005 at 02:40:38PM +0200, Andi Kleen wrote: ... > Ok where are the big issues left? Pretty much the entire kernel and anything that has a loop in it. That's why the use of preemption points can't work in that it can't be spread throughout the kernel in the way you've mentioned. > Yes, I understand that. But because of that it is not really > fair to compare the standard kernel to RT tree with all bells and whistles > enabled. I think it would be much better if RT was considered > as individual pieces, not all or nothing. The lock work is an all or nothing chunk. It's the main portion of this patch that gives the major performance boost. All other work is marginal at best to support latency or instrumentation to back it. No insult, but Ingo's has said this multipule times. bill - 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/