Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S268535AbUI3ApA (ORCPT ); Wed, 29 Sep 2004 20:45:00 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S269237AbUI3ApA (ORCPT ); Wed, 29 Sep 2004 20:45:00 -0400 Received: from holomorphy.com ([207.189.100.168]:24985 "EHLO holomorphy.com") by vger.kernel.org with ESMTP id S268535AbUI3Ao6 (ORCPT ); Wed, 29 Sep 2004 20:44:58 -0400 Date: Wed, 29 Sep 2004 17:44:47 -0700 From: William Lee Irwin III To: Judith Lebzelter Cc: linux-aio@kvack.org, linux-kernel@vger.kernel.org, akpm@osdl.org Subject: Re: OSDL aio-stress results on latest kernels show buffered random read issue Message-ID: <20040930004447.GI9106@holomorphy.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.6+20040722i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 676 Lines: 17 On Wed, Sep 29, 2004 at 04:29:08PM -0700, Judith Lebzelter wrote: > There seems to be an issue with the reads. Usually, reads > should be at least as fast as writes of the same type. > Also, there seems to be a substantial drop-off in the performance > of AIO buffered-random writes in the mm kernels. (14% on 2CPU, > 40% on 4CPU) Okay, is it cpu time or idle/iowait? If it's cpu time, where do profiles show it appears? -- wli - 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/