Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264097AbUFXJeq (ORCPT ); Thu, 24 Jun 2004 05:34:46 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264103AbUFXJeq (ORCPT ); Thu, 24 Jun 2004 05:34:46 -0400 Received: from corpmail.outblaze.com ([203.86.166.82]:58545 "EHLO corpmail.outblaze.com") by vger.kernel.org with ESMTP id S264097AbUFXJeo (ORCPT ); Thu, 24 Jun 2004 05:34:44 -0400 Date: Thu, 24 Jun 2004 17:34:40 +0800 From: Yusuf Goolamabbas To: Nick Piggin Cc: linux-kernel@vger.kernel.org Subject: Re: finish_task_switch high in profiles in 2.6.7 Message-ID: <20040624093440.GA8422@outblaze.com> References: <20040624091548.GA8264@outblaze.com> <40DA9E89.9020801@yahoo.com.au> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <40DA9E89.9020801@yahoo.com.au> User-Agent: Mutt/1.4.2i X-AntiVirus: checked by Vexira MailArmor (version: 2.0.2-5; VAE: 6.25.0.62; VDF: 6.25.0.109; host: corpmail.outblaze.com) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2283 Lines: 38 > Is it an SMP system? What sort of workload is it? Does it use threads? > Check vmstat to see how much context switching is going on with each > kernel. Yes, It's an SMP (Dual P3-800). Workload is a busy mailserver (get lots of SMTP traffic, validate users against a remote database, reject a truckload of connections). CONFIG_4K_STACKS=y on the 2.6.7 box, e100 driver with NAPI turned off. No threads The 2.6.7 box shows this wrt context swithes procs memory swap io system cpu r b swpd free buff cache si so bi bo in cs us sy wa id 3 0 0 73096 63000 78100 0 0 0 524 5571 14772 25 73 0 2 6 0 0 70932 63000 78100 0 0 0 448 5861 11368 34 65 0 1 7 0 0 72916 63008 78092 0 0 0 12 5838 14956 30 70 0 1 7 0 0 70852 63016 78084 0 0 0 1008 5551 13951 30 69 0 1 22 0 0 65300 63016 78084 0 0 0 0 5989 16043 34 66 0 1 19 0 0 66516 63020 78148 0 0 0 1252 6100 14653 31 69 0 0 29 1 0 67620 63024 78212 0 0 0 992 6314 14747 31 69 0 0 The 2.6.5 box shows this procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 166 0 0 137752 38148 188836 0 0 0 2424 5973 21695 30 70 0 0 34 0 0 135928 38160 189028 0 0 0 2160 5923 22532 32 68 0 0 28 1 0 136928 38184 189344 0 0 0 2904 6393 22098 31 69 0 0 32 1 0 136672 38204 189324 0 0 0 3240 6412 21362 32 68 0 0 33 0 0 135456 38216 189380 0 0 0 1708 6044 24735 28 72 0 0 17 0 0 135372 38264 189536 0 0 0 3044 6305 22326 35 64 0 0 229 0 0 135060 38272 189732 0 0 0 2340 6416 23697 33 67 0 0 32 0 0 134100 38288 189852 0 0 0 3068 6342 24016 33 67 0 0 16 0 0 134292 38300 190044 0 0 0 2408 6451 24727 31 69 0 0 - 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/