From owner-freebsd-hackers Thu May 24 11:31:34 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 D257E37B422 for ; Thu, 24 May 2001 11:31:28 -0700 (PDT) (envelope-from shannon@daydream.shannon.net) Received: from [209.96.185.90] (helo=escape.shannon.net) by wilma.widomaker.com with esmtp (Exim 3.22 #2) id 152ztL-00028d-00; Thu, 24 May 2001 14:31:24 -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 f4OIEZh25206; Thu, 24 May 2001 14:14:35 -0400 (EDT) Received: from shannon by daydream with local (Exim 3.12 #1 (Debian)) id 152zd3-0002jH-00; Thu, 24 May 2001 14:14:33 -0400 Date: Thu, 24 May 2001 14:14:33 -0400 From: Shannon Hendrix To: Rik van Riel Cc: "Andresen,Jason R." , Kris Kennaway , Nadav Eiron , hackers@FreeBSD.ORG Subject: Re: technical comparison Message-ID: <20010524141431.A8556@widomaker.com> References: <20010523234910.B19185@widomaker.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: ; from riel@conectiva.com.br on Thu, May 24, 2001 at 12:25:59PM -0300 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 12:25:59PM -0300, Rik van Riel wrote: > On Wed, 23 May 2001, Shannon wrote: > > On Wed, May 23, 2001 at 10:54:40PM -0300, Rik van Riel wrote: > > > > > 1. I don't think I've ever seen a Linux distro which has write > > > caching enabled by default. Hell, DMA33 isn't even enabled > > > by default ;) > > > > You are talking about controlling the IDE drive cache. > > > > The issue here is write cache in the filesystem code. > > 1) IIRC they were talking about hw.ata.wc In a subthread, yeah. I think though, the overall issue is the caching ext2 does that ufs does not. I'm not even sure that soft updates is quite the same thing. I think the soft-updates paper mentions that it shouldn't increase risk, while a lot of people feel like ext2 is very risky. I never really notice a big difference when I turn on write caching with my system (on the hard drive). It's been awhile since I did any benchmarks though, since I no longer run IDE drives on most systems. You can control the cache on them too with the right scsi tools, but I've not really messed with it. -- "There is no such thing as security. Life is either bold | | | adventure, or it is nothing -- Helen Keller" | | | ________________________________________________________________ / | \ s h a n n o n @ w i d o m a k e r . c o m _/ | \_ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message