Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261670AbVCJEMU (ORCPT ); Wed, 9 Mar 2005 23:12:20 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261372AbVCJEMK (ORCPT ); Wed, 9 Mar 2005 23:12:10 -0500 Received: from fire.osdl.org ([65.172.181.4]:43400 "EHLO smtp.osdl.org") by vger.kernel.org with ESMTP id S261193AbVCJEKy (ORCPT ); Wed, 9 Mar 2005 23:10:54 -0500 Date: Wed, 9 Mar 2005 20:10:22 -0800 From: Andrew Morton To: David Lang Cc: kenneth.w.chen@intel.com, linux-kernel@vger.kernel.org, axboe@suse.de Subject: Re: Direct io on block device has performance regression on 2.6.x kernel Message-Id: <20050309201022.7302d2ac.akpm@osdl.org> In-Reply-To: References: <200503100347.j2A3lRg28975@unix-os.sc.intel.com> X-Mailer: Sylpheed version 0.9.7 (GTK+ 1.2.10; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 456 Lines: 12 David Lang wrote: > > (I've seen a 50% > performance hit on 2.4 with just a thousand or two threads compared to > 2.6) Was that 2.4 kernel a vendor kernel with the O(1) scheduler? - 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/