From owner-freebsd-hackers Fri May 25 10: 1:32 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from wilma.widomaker.com (wilma.widomaker.com [204.17.220.5]) by hub.freebsd.org (Postfix) with ESMTP id BF28F37B422 for ; Fri, 25 May 2001 10:01:29 -0700 (PDT) (envelope-from shannon@daydream.shannon.net) Received: from [209.96.185.144] (helo=escape.shannon.net) by wilma.widomaker.com with esmtp (Exim 3.22 #2) id 153Kxl-000G09-00; Fri, 25 May 2001 13:01:22 -0400 Received: from daydream (mail@daydream.shannon.net [192.168.1.10]) by escape.shannon.net (8.11.0/8.8.8) with ESMTP id f4PGdBb09877; Fri, 25 May 2001 12:39:11 -0400 (EDT) Received: from shannon by daydream with local (Exim 3.12 #1 (Debian)) id 153KcJ-0007ES-00; Fri, 25 May 2001 12:39:11 -0400 Date: Fri, 25 May 2001 12:39:11 -0400 From: Shannon Hendrix To: Doug Barton Cc: Ed Hudson , hackers@FreeBSD.ORG Subject: Re: general speed differences between 4.1.1-RELEASE and 4.3-RELEASE Message-ID: <20010525123906.B26445@widomaker.com> References: <200105250025.f4P0Pu905553@m44.spnet.com> <3B0DF980.EDA844F7@DougBarton.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <3B0DF980.EDA844F7@DougBarton.net>; from DougB@DougBarton.net on Thu, May 24, 2001 at 11:19:44PM -0700 Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Thu, May 24, 2001 at 11:19:44PM -0700, Doug Barton wrote: > The current mood (which I agree with) is to make softupdates the default > after installation. The problem with the combo of write caching and > softupdates is that if the power actually goes off the meta-data writes > that softupdates postpones and are further postponed by the write cache > will never happen, therefore leaving the file system in a potentially > unrecoverable state. If drives could be counted on to have a synchronous write command, and the driver interface let you send a flag (cache/no-cache) with each write, would that be acceptable? In the XFS miling list at SGI, some were saying that that is what they wanted for metadata and log writes. -- "Whatever..." -- Kenny Gatdula To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message