Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757720AbYHNVQp (ORCPT ); Thu, 14 Aug 2008 17:16:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752845AbYHNVQf (ORCPT ); Thu, 14 Aug 2008 17:16:35 -0400 Received: from one.firstfloor.org ([213.235.205.2]:58297 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752467AbYHNVQe (ORCPT ); Thu, 14 Aug 2008 17:16:34 -0400 Date: Thu, 14 Aug 2008 23:17:56 +0200 From: Andi Kleen To: Chris Mason Cc: Andi Kleen , Peter Zijlstra , linux-btrfs , linux-kernel , linux-fsdevel Subject: Re: Btrfs v0.16 released Message-ID: <20080814211756.GC13814@one.firstfloor.org> References: <1217962876.15342.33.camel@think.oraclecorp.com> <1218100464.8625.9.camel@twins> <1218105597.15342.189.camel@think.oraclecorp.com> <877ias66v4.fsf@basil.nowhere.org> <1218221293.15342.263.camel@think.oraclecorp.com> <1218747656.15342.439.camel@think.oraclecorp.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1218747656.15342.439.camel@think.oraclecorp.com> User-Agent: Mutt/1.4.2.1i Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 708 Lines: 20 On Thu, Aug 14, 2008 at 05:00:56PM -0400, Chris Mason wrote: > Btrfs defaults 57.41 MB/s > Btrfs dup no csum 74.59 MB/s With duplications checksums seem to be quite costly (CPU bound?) > Btrfs no duplication 76.83 MB/s > Btrfs no dup no csum no inline 76.85 MB/s But without duplication they are basically free here at least in IO rate. Seems odd? Does it compute them twice in the duplication case perhaps? -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/