From owner-freebsd-fs@FreeBSD.ORG Mon Jun 18 15:06:07 2007 Return-Path: X-Original-To: freebsd-fs@FreeBSD.org Delivered-To: freebsd-fs@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id E5B6A16A468; Mon, 18 Jun 2007 15:06:07 +0000 (UTC) (envelope-from delphij@delphij.net) Received: from tarsier.geekcn.org (tarsier.geekcn.org [210.51.165.229]) by mx1.freebsd.org (Postfix) with ESMTP id BE9D613C469; Mon, 18 Jun 2007 15:06:06 +0000 (UTC) (envelope-from delphij@delphij.net) Received: from localhost (tarsier.geekcn.org [210.51.165.229]) by tarsier.geekcn.org (Postfix) with ESMTP id 791EAEB16D1; Mon, 18 Jun 2007 22:49:30 +0800 (CST) X-Virus-Scanned: amavisd-new at geekcn.org Received: from tarsier.geekcn.org ([210.51.165.229]) by localhost (mail.geekcn.org [210.51.165.229]) (amavisd-new, port 10024) with ESMTP id WnKo4ZKz1dbD; Mon, 18 Jun 2007 22:49:27 +0800 (CST) Received: from charlie.delphij.net (unknown [221.221.171.60]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by tarsier.geekcn.org (Postfix) with ESMTP id AF5A6EB15B4; Mon, 18 Jun 2007 22:49:26 +0800 (CST) DomainKey-Signature: a=rsa-sha1; s=default; d=delphij.net; c=nofws; q=dns; h=message-id:date:from:user-agent:mime-version:to:subject: x-enigmail-version:openpgp:content-type:content-transfer-encoding; b=p9JV+E7KtGL4ZHhbm70vXkQ5FC3x0Owk5XGw7jZEIj4jprXwmcsVqMa9sUFtZ7ic8 V7dqVDOyg3/fV2fEvXfKw== Message-ID: <46769B76.60502@delphij.net> Date: Mon, 18 Jun 2007 22:49:26 +0800 From: Xin LI User-Agent: Thunderbird 2.0.0.4 (X11/20070615) MIME-Version: 1.0 To: freebsd-current@FreeBSD.org, freebsd-fs@FreeBSD.org, jdp@FreeBSD.org X-Enigmail-Version: 0.95.1 OpenPGP: url=http://www.delphij.net/delphij.asc Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: Subject: Why vfs.timestamp_precision is set to 0 by default? 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: Mon, 18 Jun 2007 15:06:08 -0000 Hi, Recently while I'm looking into the VFS code I found that we set vfs.timestamp_precision to 0 by default. Is there any reason not to set this to, for instance 1 by default? My rough test indicates that the performance affect is almost negligible... Cheers,