Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262235AbVBQG0L (ORCPT ); Thu, 17 Feb 2005 01:26:11 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262236AbVBQGZ5 (ORCPT ); Thu, 17 Feb 2005 01:25:57 -0500 Received: from one.firstfloor.org ([213.235.205.2]:36492 "EHLO one.firstfloor.org") by vger.kernel.org with ESMTP id S262235AbVBQGZu (ORCPT ); Thu, 17 Feb 2005 01:25:50 -0500 To: Mike Snitzer Cc: linux-kernel@vger.kernel.org Subject: Re: Fwd: dm perf scales poorly with 2.6.x kernel References: <170fa0d205021520083b24c1b6@mail.gmail.com> <170fa0d20502161504f8db91b@mail.gmail.com> From: Andi Kleen Date: Thu, 17 Feb 2005 07:25:48 +0100 In-Reply-To: <170fa0d20502161504f8db91b@mail.gmail.com> (Mike Snitzer's message of "Wed, 16 Feb 2005 16:04:57 -0700") Message-ID: User-Agent: Gnus/5.110002 (No Gnus v0.2) Emacs/21.3 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 771 Lines: 18 Mike Snitzer writes: > > Ultimately there appears to be a disproportionate increase in the DM > performance hit as the IO throughput capability of the underlying > block device increases (I'm obviously using a limited sampling so...). > But given the current results it is clear there will be a performance > hit associated with using DM; but having that hit be fixed as the > throughput scales would be ideal. You could do a oprofile run to see where to CPU time is going to and post the results. -Andi - 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/