From owner-freebsd-fs@FreeBSD.ORG Tue Jun 22 08:30:08 2010 Return-Path: Delivered-To: fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id AF412106566C; Tue, 22 Jun 2010 08:30:08 +0000 (UTC) (envelope-from alexander@leidinger.net) Received: from mail.ebusiness-leidinger.de (mail.ebusiness-leidinger.de [217.11.53.44]) by mx1.freebsd.org (Postfix) with ESMTP id 38E2A8FC1E; Tue, 22 Jun 2010 08:30:08 +0000 (UTC) Received: from outgoing.leidinger.net (pD9E2C147.dip.t-dialin.net [217.226.193.71]) by mail.ebusiness-leidinger.de (Postfix) with ESMTPSA id E3E9B844042; Tue, 22 Jun 2010 10:30:04 +0200 (CEST) Received: from webmail.leidinger.net (webmail.leidinger.net [192.168.1.102]) by outgoing.leidinger.net (Postfix) with ESMTP id AC4A2546D; Tue, 22 Jun 2010 10:30:01 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=Leidinger.net; s=outgoing-alex; t=1277195401; bh=FBlOADY0t07r3Zl2Elc79ztGJ4XtUjCZOzT9pf1qKos=; h=Message-ID:Date:From:To:Cc:Subject:References:In-Reply-To: MIME-Version:Content-Type:Content-Transfer-Encoding; b=AG8FAUAIfI9z7bw3RsHieCDeKty6NpCKyr7i3OSJhDSNaCT9UwA6ENMcpGceC8vhE sSbn25KLQyryq09Pqf68wYJo37d5dORrBTMxhYS8eJjE/hsw7OTfo4l6R+3IX8fI1O MZJFpem7Ca7zTYZVC68qA6uFWVYGdUa8CUBY352XVHPzox5Uv3ywZGXU4rR5ik7bod FKkSxBnzOFGj1nNd4lLq3KTVwQ21+SNN2CPZ4M/BqsWYjGoDHWKwtRj/3mNmlwJyO5 QkuqM0ZlISTyqiGbQIoxmMbgL0Nql511YGw6HwbfTuSuVOQtt4hBaHak3r2sIL8/rL F3ingWAXgVd8g== Received: (from www@localhost) by webmail.leidinger.net (8.14.4/8.13.8/Submit) id o5M8U1Rs089212; Tue, 22 Jun 2010 10:30:01 +0200 (CEST) (envelope-from Alexander@Leidinger.net) Received: from pslux.ec.europa.eu (pslux.ec.europa.eu [158.169.9.14]) by webmail.leidinger.net (Horde Framework) with HTTP; Tue, 22 Jun 2010 10:30:01 +0200 Message-ID: <20100622103001.12481jemueuswkn4@webmail.leidinger.net> Date: Tue, 22 Jun 2010 10:30:01 +0200 From: Alexander Leidinger To: Kostik Belousov References: <20100621125825.GG13238@deviant.kiev.zoral.com.ua> <201006211030.55327.jhb@freebsd.org> <20100621184928.GI13238@deviant.kiev.zoral.com.ua> <20100622091340.25034svc6uz3k4g0@webmail.leidinger.net> <20100622081005.GQ13238@deviant.kiev.zoral.com.ua> In-Reply-To: <20100622081005.GQ13238@deviant.kiev.zoral.com.ua> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; DelSp="Yes"; format="flowed" Content-Disposition: inline Content-Transfer-Encoding: 7bit User-Agent: Dynamic Internet Messaging Program (DIMP) H3 (1.1.4) X-EBL-MailScanner-Information: Please contact the ISP for more information X-EBL-MailScanner-ID: E3E9B844042.A6975 X-EBL-MailScanner: Found to be clean X-EBL-MailScanner-SpamCheck: not spam, spamhaus-ZEN, SpamAssassin (not cached, score=-1.023, required 6, autolearn=disabled, ALL_TRUSTED -1.00, DKIM_SIGNED 0.10, DKIM_VALID -0.10, DKIM_VALID_AU -0.10, TW_FS 0.08) X-EBL-MailScanner-From: alexander@leidinger.net X-EBL-MailScanner-Watermark: 1277800206.38467@V8IP+APZLx1uL29TZcNkOw X-EBL-Spam-Status: No Cc: freebsd-fs@freebsd.org, alc@freebsd.org, fs@freebsd.org, pho@freebsd.org Subject: Re: Tmpfs elimination of double-copy X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 22 Jun 2010 08:30:08 -0000 Quoting Kostik Belousov (from Tue, 22 Jun 2010 11:10:05 +0300): > On Tue, Jun 22, 2010 at 09:13:40AM +0200, Alexander Leidinger wrote: >> Did you measure the performance before/after? If not, what are your >> performance expectations? I don't expect we get double the >> performance, but if every data of a write is copied twice, I would >> guess there is a measurable benefit. > No, I did not bothered. Real benefit of the change is the memory saving. For me the real benefit is that it survives a fsx run now. Anyone can buy more money and faster machines, but stability... This does not mean I do not appreciate the memory saving (when the change hits one of my machines, I may decide to use tmpfs in places where I didn't use it before because of memory size concerns). That being said, I'm sure that mentioning the performance aspect additionally to the fsx and memory parts may be good in the release notes (and/or a blog/whatever post of someone). Bye, Alexander. -- When I demanded of my friend what viands he preferred, He quoth: "A large cold bottle, and a small hot bird!" -- Eugene Field, "The Bottle and the Bird" http://www.Leidinger.net Alexander @ Leidinger.net: PGP ID = B0063FE7 http://www.FreeBSD.org netchild @ FreeBSD.org : PGP ID = 72077137