From owner-freebsd-questions@FreeBSD.ORG Mon Nov 10 19:00:09 2008 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 1178E106564A for ; Mon, 10 Nov 2008 19:00:09 +0000 (UTC) (envelope-from freebsd-questions@m.gmane.org) Received: from ciao.gmane.org (main.gmane.org [80.91.229.2]) by mx1.freebsd.org (Postfix) with ESMTP id 8C9148FC0C for ; Mon, 10 Nov 2008 19:00:05 +0000 (UTC) (envelope-from freebsd-questions@m.gmane.org) Received: from root by ciao.gmane.org with local (Exim 4.43) id 1KzbzW-0004EN-Bm for freebsd-questions@freebsd.org; Mon, 10 Nov 2008 19:00:02 +0000 Received: from a91-153-142-239.elisa-laajakaista.fi ([91.153.142.239]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Mon, 10 Nov 2008 19:00:02 +0000 Received: from szaka by a91-153-142-239.elisa-laajakaista.fi with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Mon, 10 Nov 2008 19:00:02 +0000 X-Injected-Via-Gmane: http://gmane.org/ To: freebsd-questions@freebsd.org From: Szabolcs Szakacsits Date: Mon, 10 Nov 2008 18:56:03 +0000 (UTC) Lines: 19 Message-ID: References: <20081109202149.GA7091@ourbrains.org> <991123400811091225t392bd3f3i531dbe348a13e5e4@mail.gmail.com> <20081109203241.GB8395@ourbrains.org> <28283d910811091235q70181b52nc4235aea61518cd@mail.gmail.com> <49174EAC.2070403@FreeBSD.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: main.gmane.org User-Agent: Loom/3.14 (http://gmane.org/) X-Loom-IP: 91.153.142.239 (Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.1.3) Gecko/20070208 Mandriva/2.0.0.3-2mdv2007.1 (2007.1) Firefox/2.0.0.3) Sender: news Subject: Re: Sluggish scheduling during a long disk copy X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 10 Nov 2008 19:00:09 -0000 Kris Kennaway FreeBSD.org> writes: > Sounds like it to me. ntfs-3g uses FUSE, which is a userland filesystem > framework. By design it will have poor I/O performance since every I/O > transfer will require multiple trips into and out of the kernel. Performance doesn't work like that for file systems because typically the dominant factors are the file system design and the quality of the implementation. Even the still unoptimized ntfs-3g driver can far outperform other kernel file systems in streaming read/write speed (maximum ever measured sustained write speed is 902 MByte/s) and IO ops on Linux. Regards, Szaka -- NTFS-3G: http://ntfs-3g.org