From owner-freebsd-current@FreeBSD.ORG Mon Mar 22 12:49:40 2010 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id E97541065672; Mon, 22 Mar 2010 12:49:39 +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 8F6438FC13; Mon, 22 Mar 2010 12:49:39 +0000 (UTC) Received: from outgoing.leidinger.net (pD954FF67.dip.t-dialin.net [217.84.255.103]) by mail.ebusiness-leidinger.de (Postfix) with ESMTPSA id B0E49844B26; Mon, 22 Mar 2010 13:49:32 +0100 (CET) Received: from webmail.leidinger.net (webmail.leidinger.net [192.168.1.102]) by outgoing.leidinger.net (Postfix) with ESMTP id B6DFA51BD; Mon, 22 Mar 2010 13:49:29 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=Leidinger.net; s=outgoing-alex; t=1269262169; bh=miJRW5cP0VaYHI4A2iGYb0DMJ9f7jCJcF67EwyWNwqI=; h=Message-ID:Date:From:To:Cc:Subject:References:In-Reply-To: MIME-Version:Content-Type:Content-Transfer-Encoding; b=ril+FxhmXGESKr4Za6mQCSymfbUrc9XBXsD9zGFHNes2J1PIiOB+QUdZ1r3AL9+Jb wyUYVJVWbVjmZjDwNno1QKujzbFPm/HIUMTdaX2EtXrJ+bLxn1rgEz2mUMAO65sq5U Mx5HtrRF0RiGNIwStS9YPuFg0N/3XypjWxvg6iJFSu4yubdWOGybi4FLTjU6ctLf9v oM1uXvwSAbJ66NHWIMyM9SHSrF32BZEdj7cdDUXfyoEjyUV9dOQmEFyUwtrPhHjJBw 8JMorRcHCIDAcTC1nU6oL0rPjmPM0xJO8vj71sMxFxj/l1YM0YY6xVoXfaoyjbBp3M t7ikQld7icwcA== Received: (from www@localhost) by webmail.leidinger.net (8.14.3/8.13.8/Submit) id o2MCnSxq048872; Mon, 22 Mar 2010 13:49:28 +0100 (CET) (envelope-from Alexander@Leidinger.net) Received: from pslux.cec.eu.int (pslux.cec.eu.int [158.169.9.14]) by webmail.leidinger.net (Horde Framework) with HTTP; Mon, 22 Mar 2010 13:49:28 +0100 Message-ID: <20100322134928.83045xnbh4nkqzok@webmail.leidinger.net> Date: Mon, 22 Mar 2010 13:49:28 +0100 From: Alexander Leidinger To: Scott Long References: <4BA4E7A9.3070502@FreeBSD.org> <201003201753.o2KHrH5x003946@apollo.backplane.com> <891E2580-8DE3-4B82-81C4-F2C07735A854@samsco.org> In-Reply-To: <891E2580-8DE3-4B82-81C4-F2C07735A854@samsco.org> 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: B0E49844B26.A3C70 X-EBL-MailScanner: Found to be clean X-EBL-MailScanner-SpamCheck: not spam, spamhaus-ZEN, SpamAssassin (not cached, score=-1.44, required 6, autolearn=disabled, ALL_TRUSTED -1.44, DKIM_SIGNED 0.00, DKIM_VERIFIED -0.00) X-EBL-MailScanner-From: alexander@leidinger.net X-EBL-MailScanner-Watermark: 1269866973.60709@WBDkZuiQeW9/cn/c0e+A1Q X-EBL-Spam-Status: No Cc: FreeBSD-Current , Alexander Motin , freebsd-arch@freebsd.org Subject: Re: Increasing MAXPHYS X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 22 Mar 2010 12:49:40 -0000 Quoting Scott Long (from Sat, 20 Mar 2010 12:17:33 -0600): > code was actually taking advantage of the larger I/O's. The > improvement really > depends on the workload, of course, and I wouldn't expect it to be noticeable > for most people unless they're running something like a media server. I don't think this is limited to media servers, think about situations where you process a large amount of data seuqntially... (seuqntial access case in a big data-warehouse scenario or a 3D render farm which get's the huge amount of data from a shared resource ("how many render-clients can I support at the same time with my disk infrastructure"-scenario) or some of the bigtable/nosql stuff which seems to be more and more popular at some sites). There are enough situations where sequential file access is the key performance metric so that I wouldn't say that only media servers depend upon large sequential I/O's. Bye, Alexander. -- That's life. What's life? A magazine. How much does it cost? Two-fifty. I only have a dollar. That's life. http://www.Leidinger.net Alexander @ Leidinger.net: PGP ID = B0063FE7 http://www.FreeBSD.org netchild @ FreeBSD.org : PGP ID = 72077137