From owner-freebsd-fs@FreeBSD.ORG Wed Sep 15 17:38:41 2010 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 16A431065672; Wed, 15 Sep 2010 17:38:41 +0000 (UTC) (envelope-from prvs=1874f602db=killing@multiplay.co.uk) Received: from mail1.multiplay.co.uk (mail1.multiplay.co.uk [85.236.96.23]) by mx1.freebsd.org (Postfix) with ESMTP id 4FEC08FC0A; Wed, 15 Sep 2010 17:38:39 +0000 (UTC) X-MDAV-Processed: mail1.multiplay.co.uk, Wed, 15 Sep 2010 18:38:35 +0100 X-Spam-Processed: mail1.multiplay.co.uk, Wed, 15 Sep 2010 18:38:35 +0100 X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on mail1.multiplay.co.uk X-Spam-Level: X-Spam-Status: No, score=-5.0 required=6.0 tests=USER_IN_WHITELIST shortcircuit=ham autolearn=disabled version=3.2.5 Received: from r2d2 by mail1.multiplay.co.uk (MDaemon PRO v10.0.4) with ESMTP id md50011249725.msg; Wed, 15 Sep 2010 18:38:35 +0100 X-Authenticated-Sender: Killing@multiplay.co.uk X-MDRemoteIP: 188.220.16.49 X-Return-Path: prvs=1874f602db=killing@multiplay.co.uk X-Envelope-From: killing@multiplay.co.uk Message-ID: From: "Steven Hartland" To: "Andriy Gapon" References: <5DB6E7C798E44D33A05673F4B773405E@multiplay.co.uk><4C85E91E.1010602@icyb.net.ua><4C873914.40404@freebsd.org><20100908084855.GF2465@deviant.kiev.zoral.com.ua><4C874F00.3050605@freebsd.org><4C8D087B.5040404@freebsd.org><03537796FAB54E02959E2D64FC83004F@multiplay.co.uk><4C8D280F.3040803@freebsd.org><3FBF66BF11AA4CBBA6124CA435A4A31B@multiplay.co.uk><4C8E4212.30000@freebsd.org> <4C90B4C8.90203@freebsd.org> <6DFACB27CA8A4A22898BC81E55C4FD36@multiplay.co.uk> <4C90D3A1.7030008@freebsd.org> <0B1A90A08DFE4ADA9540F9F3846FDF38@multiplay.co.uk> <4C90EDB8.3040709@freebsd.org> Date: Wed, 15 Sep 2010 18:38:36 +0100 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="utf-8"; reply-type=original Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5931 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5931 Cc: freebsd-fs@freebsd.org, jhell , Pawel Jakub Dawidek Subject: Re: zfs very poor performance compared to ufs due to lack of cache? 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: Wed, 15 Sep 2010 17:38:41 -0000 ----- Original Message ----- From: "Andriy Gapon" To: "Steven Hartland" Cc: ; "Pawel Jakub Dawidek" ; "jhell" Sent: Wednesday, September 15, 2010 5:00 PM Subject: Re: zfs very poor performance compared to ufs due to lack of cache? > on 15/09/2010 18:04 Steven Hartland said the following: >> Hmm, so taking a different track on the issue is the a way to make sendfile use data >> directly from ARC instead of having to copy it first? > > Or even try the opposite, if your version of ZFS permits it. > You can set primarycache=metadata on the filesystem where you have the data that > you serve via sendfile. With that setting it shouldn't get cached in ARC, but it > should be still cached in VM cache, so you should get UFS-like behavior. > > Will you test it? :) Interesting, the same for secondarycache? Regards Steve ================================================ This e.mail is private and confidential between Multiplay (UK) Ltd. and the person or entity to whom it is addressed. In the event of misdirection, the recipient is prohibited from using, copying, printing or otherwise disseminating it or any information contained in it. In the event of misdirection, illegible or incomplete transmission please telephone +44 845 868 1337 or return the E.mail to postmaster@multiplay.co.uk.